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Domain Checker

该 Skill 通过 whois、DNS NS 与 DNS A 三类信号交叉验证域名是否已注册，输出 AVAILABLE、TAKEN、LIKELY TAKEN 或 UNKNOWN。提供无系统依赖的 Python 脚本和需 whois、dig 的 Bash 脚本，支持命令行参数或管道批量查询，并可辅助筛选项目或品牌域名候选。

blueyi
blueyi
热度 59.14
最近更新 2026-05-11 17:31:45
分类：搜索依赖：代码执行 / 第三方 API应用场景：研究 / 推荐 / 工作流

安装技能

复制下面的话术发给你的 Agent，它会通过 secure-skills 检索并安装该技能。

执行命令安装此 skill： npx secure-skills-cli add domain-checker
Metadata
name
domain-checker
description
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.

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:

  1. whois Creation Date — Most authoritative. If present, domain is taken.
  2. DNS NS records — Registered domains almost always have nameservers.
  3. 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:

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

Example:

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