DNS Tools Articles

Everything you need for DNS lookups in PHP — from quick gethostbyname() calls to full dns_get_record() queries, checkdnsrr() validation, reverse DNS, and real-world email verification patterns.

Implement the DNS protocol in PHP — construct binary query packets with pack(), send raw UDP over sockets to port 53, and parse responses with unpack(). Pure PHP, no extensions required beyond sockets.

The critical difference between dns.lookup() and dns.resolve() that most Node.js tutorials miss — plus complete examples for every record type, custom resolvers, the Promises API, and TypeScript types.

Implement the DNS protocol in JavaScript — construct binary query packets with Buffer, send raw UDP to port 53 with dgram, and parse the responses. No dependencies, just Node.js built-ins.

Everything you need for DNS lookups in Python — from quick socket.getaddrinfo() calls to full-featured queries with dnspython. Covers all record types, custom nameservers, reverse DNS, async queries, and real-world patterns.

Learn the DNS protocol by implementing it — construct binary packets per RFC 1035, send raw UDP queries to port 53, and parse the responses. No libraries, just Python and sockets.

Master the dig command with real examples of every useful flag — from basic lookups and +short to +trace, +dnssec, batch queries, and scripting. The only dig reference you need.

A practical overview of every DNS diagnostic tool worth knowing — from dig and nslookup to packet captures and performance testing — with real examples of when and how to use each one.

Switching hosting providers requires careful DNS verification to avoid downtime. Learn the step-by-step process for checking A, CNAME, MX, and NS records after a migration.