Domains, DNS and whois in code – with PHP examples that run.

• PHP: Check Domain Availability the Right Way

  How to check domain availability in PHP: why DNS lookups give false positives, when RDAP returns 404, and a free API with 30 requests per minute.

• PHP dns_get_record(): Return Values, Errors, Limits

  PHP dns_get_record() explained with real output: fields per record type, empty array vs false, why DNS_ANY returns nothing, and how to handle resolver errors.

• PHP Email Validation: filter_var, MX Checks and IDNs

  PHP email validation that works: what FILTER_VALIDATE_EMAIL rejects, handling IDN domains and null MX, and when egulias/email-validator is worth it. 10 tests.

• Whois in PHP: Port 43 Lookups with fsockopen

  Whois with PHP: find the right server via whois.iana.org, follow thin-registry referrals, detect free domains. Tested code for .com, .io and .eu.

Availability, pricing and registration in code.

• Domain Registration API: EPP, REST and RDAP Compared
• MCP Servers for Domains: Tools, Tokens, PHP Client
• PHP: Check Domain Availability the Right Way
• RDAP in PHP: Query Domain Data as JSON
• Whois in PHP: Port 43 Lookups with fsockopen

Reading, checking and monitoring records.

• DNS Monitoring in PHP: Detect Record Changes via Cron
• PHP: Check MX Records with Null MX and A Fallback
• PHP dns_get_record(): Return Values, Errors, Limits

Validating domain names, IDNs and email addresses.

• Punycode in PHP: Convert IDNs with idn_to_ascii()
• PHP Email Validation: filter_var, MX Checks and IDNs
• Public Suffix List in PHP: Get the Registrable Domain
• Validate a Domain Name with Regex in PHP (Tested)

Yearly price at betadomain incl. renewal, as of 18 October 2026. compare domain prices