Query DNS records and domain registration data with zero API keys — DNS-over-HTTPS via dns.google and domain registration via RDAP, through plain curl.

MITAuto-check passedDevOps & Cloud

Install DNS Lookup

skills CLI
$ npx skills add mohitagw15856/pm-claude-skills --skill dns-lookup -a claude-code

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

GitHub CLI
$ gh skill install mohitagw15856/pm-claude-skills dns-lookup --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/mohitagw15856/pm-claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/dns-lookup .claude/skills/dns-lookup && 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
dns-lookup
GitHub stars
1.4k
Token cost
~1.2k tokens
SKILL.md length
558 words
Files
1
Skills in repo
1,348
Repo updated
First seen
Licence
MIT

At a glance

Query DNS records and domain registration data with zero API keys — DNS-over-HTTPS via dns.google and domain registration via RDAP, through plain curl.

  • Works in 5 steps: Records (DoH): curl -s… → Registration (RDAP): curl -s… → The decodes that add value: MX hosts →… → …
  • Asked what does this domain resolve to
  • SKILL.md covers What This Skill Produces, Required Inputs, Framework: The Two Protocols and Output Format, plus 3 more sections
  • Calls curl; reaches dns.google and cloudflare-dns.com

What it does

DNS Lookup is an agent skill from mohitagw15856/pm-claude-skills. Query DNS records and domain registration data with zero API keys — DNS-over-HTTPS via dns.google and domain registration via RDAP, through plain curl. Use when asked what does this domain resolve to, check the MX or TXT records, who registered this domain, when does it expire, or has DNS propagated. Produces the records decoded (SPF/DKIM/DMARC read, not just dumped), the registration facts from RDAP, and the rerunnable commands.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in DevOps & Cloud. The repository describes itself as: 1255 professional Agent Skills for Claude, ChatGPT, Gemini, Cursor & Codex — PRDs, postmortems, leases, medical bills, layoffs, go-bags, new countries. Plain markdown, MIT, in… The licence is MIT.

When your agent uses it

  • Asked what does this domain resolve to
  • Who registered this domain
  • Has DNS propagated

Example prompts

  • “/dns-lookup”

Workflow steps

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

  1. Records (DoH): curl -s "https://dns.google/resolve?name=github.com&type=MX" — types by name (A, AAAA, MX, TXT, CNAME, NS, SOA, CAA)…
  2. Registration (RDAP): curl -s "https://rdap.org/domain/github.com" — rdap.org bootstraps to the right registry. Read: events…
  3. The decodes that add value: MX hosts → the provider ("aspmx.l.google.com → Google Workspace"); TXT v=spf1 → which services may send mail…
  4. Propagation is TTL + resolver spread: compare answers across dns.google and Cloudflare, quote the TTL, and frame "propagated?" as "these…
  5. Read-only boundary: lookups, decoding, and diagnosis — yes; this skill doesn't do zone changes, subdomain enumeration sweeps, or anything…

What it can do on your machine

Read from SKILL.md and the folder at commit 1cbf1f0. 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

    Shell commands in SKILL.md call:

    • curl

    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.google
    • cloudflare-dns.com
    • rdap.org

    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

DNS Lookup loads about 1.2k tokens when it runs. Until then it costs about 111 tokens; SKILL.md has 558 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~111
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

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 passed

The automated check found no risky patterns in SKILL.md.

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from mohitagw15856/pm-claude-skills at commit 1cbf1f0, republished under its MIT licence (© mohitagw15856). 558 words, ~1,171 tokens.

Download SKILL.mdSave it as .claude/skills/dns-lookup/SKILL.md (or your agent's skills folder).
name
dns-lookup
description
Query DNS records and domain registration data with zero API keys — DNS-over-HTTPS via dns.google and domain registration via RDAP, through plain curl. Use when asked what does this domain resolve to, check the MX or TXT records, who registered this domain, when does it expire, or has DNS propagated. Produces the records decoded (SPF/DKIM/DMARC read, not just dumped), the registration facts from RDAP, and the rerunnable commands.

DNS Lookup Skill

DNS questions ("did the record propagate," "where's mail for this domain going," "who owns this") come with two keyless answers: Google's DNS-over-HTTPS for records, and RDAP — WHOIS's structured successor — for registration. This skill queries both, and does the part dig doesn't: decoding what the records mean — an SPF string into its policy, MX priorities into the actual mail provider, an expiry date into "renews in 6 weeks."

What This Skill Produces

  • The records — A/AAAA/MX/TXT/CNAME/NS/whatever was asked, with TTLs
  • The decode — mail provider identified from MX, SPF/DMARC policies read out, CNAME chains followed
  • Registration facts — registrar, creation/expiry dates, status codes (from RDAP; contact data is mostly redacted now, and the answer says so)
  • The commands — exact curls, rerunnable

Required Inputs

Ask for these if not provided:

  • The domain — and the record type if the question implies one ("where's mail going" → MX; "is the site moved" → A/CNAME; "verify ownership token" → TXT)
  • The scenario — propagation check, email debugging, domain due-diligence, expiry watch — the decode leads with it

Framework: The Two Protocols

  1. Records (DoH): curl -s "https://dns.google/resolve?name=github.com&type=MX" — types by name (A, AAAA, MX, TXT, CNAME, NS, SOA, CAA). Cloudflare as fallback/second opinion: curl -s -H "accept: application/dns-json" "https://cloudflare-dns.com/dns-query?name=github.com&type=A". Two resolvers agreeing is also the honest propagation check.
  2. Registration (RDAP): curl -s "https://rdap.org/domain/github.com" — rdap.org bootstraps to the right registry. Read: events (registration/expiration dates), status (clientTransferProhibited etc. — decode the meaningful ones), registrar entity. Expect redacted contacts — post-privacy-era WHOIS data is minimal, and pretending otherwise misleads.
  3. The decodes that add value: MX hosts → the provider ("aspmx.l.google.com → Google Workspace"); TXT v=spf1 → which services may send mail and the -all/~all strictness; _dmarc TXT → the policy (none/quarantine/reject) in words; CNAME chains followed to their end.
  4. Propagation is TTL + resolver spread: compare answers across dns.google and Cloudflare, quote the TTL, and frame "propagated?" as "these major resolvers see the new value; stragglers cache up to [TTL]."
  5. Read-only boundary: lookups, decoding, and diagnosis — yes; this skill doesn't do zone changes, subdomain enumeration sweeps, or anything aimed at finding weaknesses in third-party domains. Debugging your own mail is the use case; auditing someone else's attack surface is not.
Show full SKILL.md (205 more words)Show less

Output Format

DNS: [domain] [record type(s)]

[The decoded answer first: "Mail goes to Google Workspace; SPF allows Google + Mailchimp, DMARC is quarantine."]

RecordValueTTLDecoded

[Registration section when asked: registrar · created · expires ("renews in N weeks") · status decoded · contacts: redacted, as is normal]

Source: [dns.google / Cloudflare DoH / RDAP] · rerun: [exact curls] [Propagation mode: the two-resolver comparison and the TTL framing]

Quality Checks

  • The decode leads — the provider/policy in words before the record table
  • SPF/DMARC strings are read out, not just quoted
  • Propagation answers compare two resolvers and quote TTL
  • RDAP redaction is stated as normal, not as a finding
  • Every answer carries its rerunnable curl

Anti-Patterns

  • Do not dump records without decoding — the MX hostname is a clue, the provider name is an answer
  • Do not answer from memory — DNS is live by definition; fetch or hand over the command
  • Do not promise global propagation — resolvers cache; frame it as major-resolvers + TTL
  • Do not treat redacted WHOIS/RDAP contacts as suspicious — it's the post-privacy default
  • Do not slide into recon — decoding your domain's mail setup and enumerating someone else's infrastructure are different activities, and this skill does the first

Example Trigger Phrases

  • "Check the MX or TXT records."
  • "Who registered this domain?"
  • "Does it expire?"

© mohitagw15856, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/dns-lookup of mohitagw15856/pm-claude-skills.

Open the folder on GitHubat commit 1cbf1f0

Compare with similar skills

DNS Lookup next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

DNS Lookup compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
DNS Lookup this skillmohitagw15856/pm-claude-skills1.4k—~1.2kAutomated safety check: PassMIT
Monitor CInrwl/nx29k6 repos~4.7kAutomated safety check: PassMIT
Terraform and OpenTofu Guideagentscope-ai/QwenPaw36k6 repos~4.2kAutomated safety check: PassApache-2.0
Vercel Optimize Auditvercel-labs/agent-skills32k8 repos~4.3kAutomated safety check: PassNone
Analyze GitHub Action Logswithastro/astro63k1 repos~1.3kAutomated safety check: PassCustom licence
Openclaw Live Updateropenclaw/openclaw392k—~3.7kAutomated safety check: PassMIT

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Categories

Questions about DNS Lookup

What does DNS Lookup do?

Query DNS records and domain registration data with zero API keys — DNS-over-HTTPS via dns.google and domain registration via RDAP, through plain curl. DNS Lookup is an agent skill from mohitagw15856/pm-claude-skills.google and domain registration via RDAP, through plain curl.

When should I use DNS Lookup?

DNS Lookup fits situations like: asked what does this domain resolve to; who registered this domain; has DNS propagated.

How do I install DNS Lookup in Claude Code?

Run `npx skills add mohitagw15856/pm-claude-skills --skill dns-lookup -a claude-code`. Or copy the skill folder (skills/dns-lookup in mohitagw15856/pm-claude-skills) into .claude/skills/dns-lookup in your project. Claude Code loads it when a task matches its description.

How do I install DNS Lookup in Codex?

Run `npx skills add mohitagw15856/pm-claude-skills --skill dns-lookup -a codex`. Or copy the skill folder (skills/dns-lookup in mohitagw15856/pm-claude-skills) into .agents/skills/dns-lookup in your project. Codex loads it when a task matches its description.

Can I use DNS Lookup 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 mohitagw15856/pm-claude-skills --skill dns-lookup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/dns-lookup, .gemini/skills/dns-lookup, .github/skills/dns-lookup and .opencode/skills/dns-lookup in your project.

What does DNS Lookup need to run?

Going by SKILL.md and its folder, DNS Lookup needs the command-line tools its instructions call (curl).

Does DNS Lookup access the network?

SKILL.md names 3 domains. In commands or code: dns.google, cloudflare-dns.com and rdap.org; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is DNS Lookup safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does DNS Lookup use?

DNS Lookup is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does DNS Lookup use?

About 1.2k tokens (SKILL.md is roughly 4.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to DNS Lookup?

Skills that share tags, products or a category with DNS Lookup: Monitor CI (nrwl/nx, 29k stars), Terraform and OpenTofu Guide (agentscope-ai/QwenPaw, 36k stars), Vercel Optimize Audit (vercel-labs/agent-skills, 32k stars) and Analyze GitHub Action Logs (withastro/astro, 63k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains DNS Lookup?

mohitagw15856 (a GitHub user) maintains it in mohitagw15856/pm-claude-skills, which has 1,434 GitHub stars. The repository holds 1,348 skills in this directory. The repository was last updated on October 9, 2026.

Source: mohitagw15856/pm-claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.