check.town valid

CheckTown

Free online validators, converters, and developer tools. No account needed. Instant results.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-24T05:26:17.717Z. Cached copy · Source on check.town

# CheckTown

> Free online validators, converters, and developer tools. No account needed. Instant results.

CheckTown is a collection of 253 free browser-based tools for developers, analysts, and anyone who works with data. All tools run in the browser — no server-side processing of sensitive input, no registration, no cost.

Available in 9 languages: English, French, Dutch, Ukrainian, Spanish, Italian, Polish, Portuguese, Russian.

## Validators

- [All Validators](https://check.town/validators)
- [Email Validator](https://check.town/email-validator): Free email address validator. Instantly check syntax, domain existence, MX records, and deliverability. No registration required. ([guide](https://check.town/blog/email-validator-guide))
- [IBAN Validator](https://check.town/iban-validator): Free IBAN validator. Instantly check format, country code, check digits, checksum, and BBAN structure. Bank identification included. No registration. ([guide](https://check.town/blog/iban-validator-guide))
- [BIC / SWIFT Validator](https://check.town/bic-validator): Free BIC/SWIFT code validator. Instantly verify institution code, country code, location code, and branch code. No registration required. ([guide](https://check.town/blog/bic-swift-validator-guide))
- [Phone Number Validator](https://check.town/phone-validator): Free phone number validator. Check format, country code, number type, and validity for international numbers. No registration required. ([guide](https://check.town/blog/phone-number-validator-guide))
- [VAT Number Validator](https://check.town/vat-validator): Free VAT number validator. Instantly check format, country prefix, check digits, and structure for EU VAT numbers. No registration required. ([guide](https://check.town/blog/vat-number-validator-guide))
- [Address Validator](https://check.town/address-validator): Free address validator. Check street, city, postal code, and country accuracy. Verify addresses in 240+ countries. No registration required. ([guide](https://check.town/blog/address-validator-guide))
- [URL Validator](https://check.town/url-validator): Free URL validator. Instantly check format, protocol, hostname, structure, and HTTPS security. No registration required. ([guide](https://check.town/blog/url-validator-guide))
- [IP Address Validator](https://check.town/ip-validator): Free IP address validator. Check format, detect IPv4/IPv6, classify range, validate CIDR notation, and test reachability. No registration. ([guide](https://check.town/blog/ip-address-validator-guide))
- [Password Strength Checker](https://check.town/password-checker): Free password strength checker. Test security with entropy analysis, dictionary checks, and crack time estimates. No registration required. ([guide](https://check.town/blog/password-strength-checker-guide))
- [Data Format Validator](https://check.town/data-format-validator): Free JSON, YAML, and XML validator. Instantly validate syntax, format and beautify your data. No registration r
…

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Machine-readable: GET /v1/resolve?q=check.town · GET /v1/domain/check.town · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for check.town:
1. POST https://agentwebmap.com/v1/sites/check.town/claims and keep claim_id and claim_secret private.
2. Publish the proof: add the line "AgentWebMap ownership: <token>" (token from step 1) to https://check.town/llms.txt, or use the DNS, meta-tag or well-known method the response describes.
3. POST https://agentwebmap.com/v1/sites/check.town/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/check.town).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

Corrections or removal requests: contact the directory.