Skills domain-checker

Check whether domain names are available for registration. Use when a user asks to verify domain availability, find unregistered domains, brainstorm project/brand names with domain checks, or any task involving "is this domain taken?". Supports .com, .net, .org, .io, .ai, .so, and other TLDs. Cross-verifies via whois + DNS NS + DNS A records for reliable results.

install

source · Clone the upstream repo

git clone https://github.com/openclaw/skills

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/blueyi/domain-checker" ~/.claude/skills/clawdbot-skills-domain-checker && rm -rf "$T"

manifest: skills/blueyi/domain-checker/SKILL.md

source content

Domain Checker

Check domain availability using

whois

+ DNS cross-verification. Single source of truth for all domain availability queries.

Quick Start

Run the Python script (no system dependencies — no

whois

dig

CLI needed):

python3 scripts/check_domains.py example.com myproject.io brand.ai

Or pipe a list:

echo "foo.com bar.ai baz.io" | python3 scripts/check_domains.py

Legacy bash script (requires

whois

dig

CLI):

bash scripts/check_domains.sh example.com myproject.io brand.ai

Output Format

Each domain gets one of three verdicts:

Symbol	Meaning	Confidence
✅ AVAILABLE	whois says "not found" AND no DNS NS records	High
❌ TAKEN	whois shows Creation Date OR DNS records exist	High
⚠️ LIKELY TAKEN	Conflicting signals (whois unclear but DNS exists)	Medium
❓ UNKNOWN	whois returned no data — verify manually	Low

How It Works

Three independent signals are cross-verified:

whois Creation Date — Most authoritative. If present, domain is taken.
DNS NS records — Registered domains almost always have nameservers.
DNS A records — Fallback signal for parked/active domains.

A domain is only marked AVAILABLE when whois explicitly says "not found" AND no DNS records exist. This eliminates false positives from unreliable whois web interfaces.

Important Notes

Rate limiting: The script waits 1 second between queries to avoid whois server throttling. For large batches (>50), consider splitting into multiple runs.
whois web interfaces are unreliable: Sites like whois.com often return stale/incorrect data. This script uses the
```
whois
```
CLI directly.
.ai TLD quirk: The .ai whois server sometimes returns sparse data. The script handles this by also checking DNS.
Premium/aftermarket domains: A domain may be "available" in whois but listed at a premium price on registrars. The script cannot detect this — check the registrar for actual purchase price.
Python script: No system dependencies — uses stdlib
```
socket
```
for whois (port 43) and DNS resolution.
Bash script (legacy): Requires
```
whois
```
and
```
dig
```
CLI tools (pre-installed on most Linux/macOS systems).

Batch Domain Brainstorming

When helping users brainstorm project names with domain checks, use this workflow:

Generate 15-30 candidate names based on user criteria
Run all candidates through the script in one batch
Present only the AVAILABLE results with analysis
Iterate on available candidates if needed

Example:

python3 scripts/check_domains.py myapp.com myapp.ai myapp.io coolname.com coolname.ai