ToolsTool category
Network
Answer the questions that come up while debugging a request: whose address is this, what does DNS actually return, what did that client claim to be.
6 toolsSorted by the GitHub stars of each tool's open-source project · snapshot Oct 23, 2026
#01
DNS lookup: A, AAAA, MX, TXT, NS, CNAME
Ask a public resolver what a domain actually returns, right now.
#02User agent parser
Turn a User-Agent string into browser, engine, OS and device.
#03IP address lookup: ASN, network and country
Find out who announces an address, from which prefix, and where.
#04Punycode converter (IDN)
Convert internationalised domain names such as 中国.公司 or münchen.de to their xn-- Punycode form and back, and spot look-alike domains.
#05URL parser
Break a URL into protocol, host, path, query and fragment.
#06CIDR subnet calculator
Work out the network, broadcast, host range and mask of any IPv4 or IPv6 block, check containment and split it into subnets.