Networking Tools

Lightweight utilities for DNS, reverse DNS, ASN/ISP lookup, and subnet calculations.

DNS Lookup

Query A, AAAA, MX, NS, TXT, CNAME, and SOA records for a domain.

Resolve a public IP address to its hostname.

Find autonomous system details by ASN or IP address.

Identify the ISP and organization behind a public IP.

Calculate network, broadcast, and host ranges from CIDR notation.

IPv4 subnet mask, wildcard mask, and usable host calculations.

Validate IPv4 and IPv6 syntax locally without external APIs.