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Agent skill

Implementing Zero Trust DNS With Nextdns

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME…

Apache-2.0Auto-check: notesSecurity

Install Implementing Zero Trust DNS With Nextdns

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-zero-trust-dns-with-nextdns -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-zero-trust-dns-with-nextdns --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/implementing-zero-trust-dns-with-nextdns .claude/skills/implementing-zero-trust-dns-with-nextdns && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
implementing-zero-trust-dns-with-nextdns
GitHub stars
34k
Token cost
~2.8k tokens
SKILL.md length
434 words
Files
8 (incl. scripts, references, assets)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME…

  • Works in 10 steps: Enforce encrypted DNS: Block plaintext… → Use NextDNS CLI on endpoints: Ensures… → Enable NRD blocking: Newly registered… → …
  • Deploying DNS-layer threat blocking and acceptable-use enforcement
  • SKILL.md covers Overview, When to Use, Prerequisites and Architecture, plus 7 more sections
  • Runs Python scripts from its folder; calls curl, sh and brew; reaches dns.nextdns.io and nextdns.io

What it does

Implementing Zero Trust DNS With Nextdns is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME cloaking, and enforces organizational DNS policy across endpoints. Use when deploying DNS-layer threat blocking and acceptable-use enforcement, or when extending zero trust controls (including Windows 11 Zero Trust DNS) to the DNS resolution path.

Its SKILL.md is about 2.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).

It sits in Security, covering OSINT and GraphQL. It works with Windows and Linux. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Deploying DNS-layer threat blocking and acceptable-use enforcement
  • Extending zero trust controls (including Windows 11 Zero Trust DNS) to the DNS resolution path

Example prompts

  • “/implementing-zero-trust-dns-with-nextdns”

Requirements

  • Python 3

Workflow steps

10 steps, taken from the first numbered list in SKILL.md.

  1. Enforce encrypted DNS: Block plaintext DNS (port 53 UDP/TCP) at the firewall
  2. Use NextDNS CLI on endpoints: Ensures per-device identification and logging
  3. Enable NRD blocking: Newly registered domains are overwhelmingly malicious
  4. Block DNS-over-HTTPS bypass: Ensure browsers use system DNS, not built-in DoH
  5. Review blocklists quarterly: Remove false positives, add organizational blocks
  6. Enable CNAME cloaking protection: Prevents tracker evasion via CNAME records
  7. Set appropriate log retention: Balance privacy with forensic needs (90 days recommended)
  8. Monitor for DNS tunneling: Watch for unusual query patterns and high entropy domains
  9. Deploy at router level: Catches all devices including IoT and unmanaged endpoints
  10. Combine with endpoint DNS: Defense in depth with both router and per-device filtering

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • curl
    • sh
    • brew
    • jq

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • dns.nextdns.io
    • nextdns.io
    • api.nextdns.io

    Also links to:

    • tools.ietf.org
    • github.com
    • learn.microsoft.com
    • csrc.nist.gov

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Implementing Zero Trust DNS With Nextdns loads about 2.8k tokens when it runs, and up to ~4.3k if it reads all its reference files. Until then it costs about 121 tokens; SKILL.md has 434 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~121
When it runs · the whole SKILL.md, loaded when a task matches
~2.8k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~4.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteRuns commands with sudoSKILL.md:162
    sudo tee /etc/systemd/resolved.conf << 'EOF'
  • NoteRuns commands with sudoSKILL.md:172
    sudo systemctl restart systemd-resolved
  • NoteRuns commands with sudoSKILL.md:186
    sudo nextdns install \
  • NoteRuns commands with sudoSKILL.md:203
    sudo nextdns install \

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 434 words, ~2,820 tokens.

Download SKILL.mdSave it as .claude/skills/implementing-zero-trust-dns-with-nextdns/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
implementing-zero-trust-dns-with-nextdns
description
Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME cloaking, and enforces organizational DNS policy across endpoints. Use when deploying DNS-layer threat blocking and acceptable-use enforcement, or when extending zero trust controls (including Windows 11 Zero Trust DNS) to the DNS resolution path.
domain
cybersecurity
subdomain
zero-trust-architecture
tags
zero-trust, dns, nextdns, dns-over-https, dns-over-tls, threat-blocking, dns-filtering, privacy, encrypted-dns
version
1.0
author
mahipal
license
Apache-2.0
nist_csf
PR.AA-01, PR.AA-05, PR.IR-01, GV.PO-01
mitre_attack
T1078, T1190, T1059, T1573, T1486

Implementing Zero Trust DNS with NextDNS

Overview

NextDNS is a cloud-based DNS resolver that provides encrypted DNS resolution (DNS-over-HTTPS and DNS-over-TLS), real-time threat intelligence blocking, ad and tracker filtering, and granular DNS policy enforcement. In a zero trust architecture, DNS is a critical control point -- every network connection begins with a DNS query, making DNS filtering an effective layer for blocking malicious domains, preventing data exfiltration via DNS tunneling, enforcing acceptable use policies, and gaining visibility into all network communications. NextDNS processes queries using threat intelligence feeds containing millions of malicious domains updated in real-time, blocks cryptojacking and phishing domains, detects DNS rebinding attacks, and supports CNAME cloaking protection. For enterprise environments, Microsoft's Zero Trust DNS (ZTDNS) feature on Windows 11 extends this concept by enforcing that endpoints can only resolve domains through approved protected DNS servers.

When to Use

  • When deploying or configuring implementing zero trust dns with nextdns capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • NextDNS account (free tier: 300,000 queries/month; Pro: unlimited)
  • Network devices supporting DoH or DoT configuration
  • Administrative access to endpoint DNS settings
  • Understanding of DNS protocol and resolution chain
  • Familiarity with organizational acceptable use policies

Architecture

    Endpoint Device
         |
    DNS Query (Encrypted)
         |
    +----+----+
    |  DoH/DoT |  (DNS-over-HTTPS or DNS-over-TLS)
    |  Tunnel  |
    +----+----+
         |
    +----+----+
    | NextDNS  |
    | Resolver |
    +----+----+
         |
    +----+----+------+--------+
    |         |       |        |
  Threat   Ad/Tracker Privacy  Parental
  Intel    Blocklists Controls Controls
  Check    Check      Check    Check
    |         |       |        |
    +----+----+------+--------+
         |
    ALLOW or BLOCK
         |
    Response to Endpoint

Configuration Setup

NextDNS Profile Configuration
Dashboard: https://my.nextdns.io

Configuration ID: abc123 (unique per profile)

Endpoints:
  DNS-over-HTTPS: https://dns.nextdns.io/abc123
  DNS-over-TLS:   abc123.dns.nextdns.io
  DNS-over-QUIC:  quic://abc123.dns.nextdns.io
  IPv4:           45.90.28.x, 45.90.30.x (linked to config)
  IPv6:           2a07:a8c0::xx, 2a07:a8c1::xx
Security Settings
Security Tab Configuration:
  [x] Threat Intelligence Feeds - Block domains from curated threat feeds
  [x] AI-Driven Threat Detection - Machine learning-based detection
  [x] Google Safe Browsing - Cross-reference with Google's threat database
  [x] Cryptojacking Protection - Block crypto mining domains
  [x] DNS Rebinding Protection - Prevent DNS rebinding attacks
  [x] IDN Homograph Attacks - Block internationalized domain name attacks
  [x] Typosquatting Protection - Block common typosquatting domains
  [x] DGA Protection - Block domain generation algorithm domains
  [x] NRD (Newly Registered Domains) - Block domains < 30 days old
  [x] DDNS (Dynamic DNS) - Block dynamic DNS services
  [x] Parked Domains - Block parked/unused domains
  [x] CSAM - Block child sexual abuse material domains
Privacy Settings
Privacy Tab Configuration:
  Blocklists:
    [x] NextDNS Ads & Trackers Blocklist
    [x] OISD (Full)
    [x] EasyPrivacy
    [x] AdGuard DNS Filter

  Native Tracking Protection:
    [x] Block Windows telemetry
    [x] Block Apple telemetry
    [x] Block Samsung telemetry
    [x] Block Xiaomi telemetry
    [x] Block Huawei telemetry
    [x] Block Roku telemetry
    [x] Block Sonos telemetry

  [x] Block Disguised Third-Party Trackers (CNAME cloaking)
  [x] Allow Affiliate & Tracking Links (optional, for business)
Allowlist and Denylist
Allowlist (domains that bypass all blocking):
  - login.microsoftonline.com
  - graph.microsoft.com
  - *.company.com

Denylist (always blocked regardless of other settings):
  - known-malicious-domain.com
  - unauthorized-cloud-storage.com
  - personal-email-provider.com  (if policy requires)

Endpoint Deployment

Linux (systemd-resolved)
bash
# Configure DNS-over-TLS with systemd-resolved
sudo tee /etc/systemd/resolved.conf << 'EOF'
[Resolve]
DNS=45.90.28.x#abc123.dns.nextdns.io
DNS=45.90.30.x#abc123.dns.nextdns.io
DNS=2a07:a8c0::xx#abc123.dns.nextdns.io
DNS=2a07:a8c1::xx#abc123.dns.nextdns.io
DNSOverTLS=yes
Domains=~.
EOF

sudo systemctl restart systemd-resolved

# Verify
resolvectl status
resolvectl query example.com
Linux (NextDNS CLI)
bash
# Install NextDNS CLI
sh -c 'sh -e $(curl -sL https://nextdns.io/install)'

# Configure with your profile
sudo nextdns install \
  -config abc123 \
  -report-client-info \
  -auto-activate

# Verify
nextdns status
nextdns log
macOS
bash
# Install via Homebrew
brew install nextdns/tap/nextdns

# Configure
sudo nextdns install \
  -config abc123 \
  -report-client-info

# Or configure via System Settings > Network > DNS
# Add DNS-over-HTTPS: https://dns.nextdns.io/abc123
Windows
powershell
# Install NextDNS CLI for Windows
# Download from: https://nextdns.io/download/windows

# Or configure DoH natively (Windows 11)
# Settings > Network & Internet > Ethernet/Wi-Fi > DNS
# Preferred DNS: 45.90.28.x
# DNS over HTTPS: On (Manual template)
# DoH Template: https://dns.nextdns.io/abc123

# PowerShell: Configure DoH
Set-DnsClientDohServerAddress -ServerAddress "45.90.28.x" `
  -DohTemplate "https://dns.nextdns.io/abc123" `
  -AllowFallbackToUdp $false `
  -AutoUpgrade $true
Router-Level Configuration
# Most routers support custom DNS servers
# For DoH/DoT-capable routers (pfSense, OPNsense, OpenWrt):

# pfSense DNS Resolver (Unbound):
# Services > DNS Resolver > Custom Options:
server:
  forward-zone:
    name: "."
    forward-tls-upstream: yes
    forward-addr: 45.90.28.x@853#abc123.dns.nextdns.io
    forward-addr: 45.90.30.x@853#abc123.dns.nextdns.io

# OpenWrt (using https-dns-proxy):
opkg update && opkg install https-dns-proxy
uci set https-dns-proxy.default.resolver_url='https://dns.nextdns.io/abc123'
uci commit https-dns-proxy
/etc/init.d/https-dns-proxy restart
Mobile Devices
iOS:
  Install NextDNS app from App Store
  Or: Settings > General > VPN & Device Management
  Install NextDNS configuration profile

Android:
  Settings > Network > Private DNS
  DNS Provider: abc123.dns.nextdns.io

  Or: Install NextDNS app from Play Store

Microsoft Zero Trust DNS (Windows 11)

For enterprise Windows environments, Microsoft's ZTDNS enforces that endpoints can only communicate with domains resolved through approved DNS servers.

powershell
# Enable ZTDNS (Windows 11 23H2+)
# Requires Windows Defender Firewall in enforcing mode

# Configure Protected DNS Servers via Group Policy:
# Computer Configuration > Administrative Templates > Network > DNS Client
# > Configure DNS over HTTPS (DoH) name resolution
# > Protected DNS servers: https://dns.nextdns.io/abc123

# Windows Firewall blocks all traffic to domains not resolved
# through the protected DNS server
Show full SKILL.md (169 more words)Show less

Monitoring and Analytics

Log Analysis
NextDNS Analytics Dashboard provides:
  - Total queries over time
  - Blocked queries by category
  - Top domains (allowed and blocked)
  - Top blocked reasons (threat, ad, tracker)
  - Device-level breakdown
  - Geographic query distribution

Log Settings:
  Retention: 1 hour / 6 hours / 1 day / 1 week / 1 month / 3 months / 1 year / 2 years
  Storage Location: US / EU / UK / Switzerland
  Logging: [ ] Enable / [ ] Disable
API Integration
bash
# NextDNS API for automated monitoring
# Get analytics data
curl -H "X-Api-Key: your-api-key" \
  "https://api.nextdns.io/profiles/abc123/analytics/domains?from=-24h"

# Get blocked domains
curl -H "X-Api-Key: your-api-key" \
  "https://api.nextdns.io/profiles/abc123/analytics/domains?from=-24h&status=blocked"

# Export logs for SIEM integration
curl -H "X-Api-Key: your-api-key" \
  "https://api.nextdns.io/profiles/abc123/logs?from=-1h" \
  | jq '.data[] | select(.status == "blocked")'

Zero Trust DNS Policy Framework

Policy Tiers
Tier 1 - Security (Mandatory for all):
  - Threat intelligence blocking
  - Cryptojacking protection
  - DNS rebinding protection
  - DGA detection
  - NRD blocking (< 30 days)

Tier 2 - Privacy (Recommended):
  - Tracker blocking
  - Native telemetry blocking
  - CNAME cloaking protection

Tier 3 - Compliance (Organization-specific):
  - Category-based blocking
  - Custom allowlists/denylists
  - Time-based access policies
  - Log retention per regulatory requirements

Security Best Practices

  1. Enforce encrypted DNS: Block plaintext DNS (port 53 UDP/TCP) at the firewall
  2. Use NextDNS CLI on endpoints: Ensures per-device identification and logging
  3. Enable NRD blocking: Newly registered domains are overwhelmingly malicious
  4. Block DNS-over-HTTPS bypass: Ensure browsers use system DNS, not built-in DoH
  5. Review blocklists quarterly: Remove false positives, add organizational blocks
  6. Enable CNAME cloaking protection: Prevents tracker evasion via CNAME records
  7. Set appropriate log retention: Balance privacy with forensic needs (90 days recommended)
  8. Monitor for DNS tunneling: Watch for unusual query patterns and high entropy domains
  9. Deploy at router level: Catches all devices including IoT and unmanaged endpoints
  10. Combine with endpoint DNS: Defense in depth with both router and per-device filtering

References

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 7 other files (scripts, references, assets) in skills/implementing-zero-trust-dns-with-nextdns of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • assets/template.md
  • references/api-reference.md
  • references/standards.md
  • references/workflows.md
  • scripts/agent.py
  • scripts/process.py

Open the folder on GitHubat commit 54a7988

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Works with

Categories

Questions about Implementing Zero Trust DNS With Nextdns

What does Implementing Zero Trust DNS With Nextdns do?

Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME…. Implementing Zero Trust DNS With Nextdns is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configure NextDNS as an encrypted (DoH/DoT) zero trust DNS resolver that blocks malicious, phishing, and cryptojacking domains via real-time threat intelligence, detects DNS rebinding and CNAME cloaking, and enforces organizational DNS policy across endpoints.

When should I use Implementing Zero Trust DNS With Nextdns?

Implementing Zero Trust DNS With Nextdns fits situations like: deploying DNS-layer threat blocking and acceptable-use enforcement; extending zero trust controls (including Windows 11 Zero Trust DNS) to the DNS resolution path.

How do I install Implementing Zero Trust DNS With Nextdns in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-zero-trust-dns-with-nextdns -a claude-code`. Or copy the skill folder (skills/implementing-zero-trust-dns-with-nextdns in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/implementing-zero-trust-dns-with-nextdns in your project. Claude Code loads it when a task matches its description.

How do I install Implementing Zero Trust DNS With Nextdns in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-zero-trust-dns-with-nextdns -a codex`. Or copy the skill folder (skills/implementing-zero-trust-dns-with-nextdns in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/implementing-zero-trust-dns-with-nextdns in your project. Codex loads it when a task matches its description.

Can I use Implementing Zero Trust DNS With Nextdns in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-zero-trust-dns-with-nextdns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implementing-zero-trust-dns-with-nextdns, .gemini/skills/implementing-zero-trust-dns-with-nextdns, .github/skills/implementing-zero-trust-dns-with-nextdns and .opencode/skills/implementing-zero-trust-dns-with-nextdns in your project.

What does Implementing Zero Trust DNS With Nextdns need to run?

Going by SKILL.md and its folder, Implementing Zero Trust DNS With Nextdns needs Python for the scripts in its folder and the command-line tools its instructions call (curl, sh, brew and jq). Our summary lists: Python 3.

Does Implementing Zero Trust DNS With Nextdns access the network?

SKILL.md names 7 domains. In commands or code: dns.nextdns.io, nextdns.io and api.nextdns.io; the agent is likely to contact these when it follows the instructions. As links in the text: tools.ietf.org, github.com, learn.microsoft.com and csrc.nist.gov. This is read from the text; nothing was executed.

Is Implementing Zero Trust DNS With Nextdns safe to install?

Our automated static check of SKILL.md found notes only (runs commands with sudo), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Implementing Zero Trust DNS With Nextdns use?

Implementing Zero Trust DNS With Nextdns is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Implementing Zero Trust DNS With Nextdns use?

About 2.8k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.5k tokens, read only when the agent opens those files.

What are the alternatives to Implementing Zero Trust DNS With Nextdns?

Skills that share tags, products or a category with Implementing Zero Trust DNS With Nextdns: Company Contact Finder (gooseworks-ai/goose-skills, 1.2k stars), Apollo Lead Finder (gooseworks-ai/goose-skills, 1.2k stars), Leadership Change Outreach (gooseworks-ai/goose-skills, 1.2k stars) and Apollo Core Workflow A (jeremylongshore/tons-of-skills-marketplace, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Implementing Zero Trust DNS With Nextdns?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 33,993 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.