Network Tools
Work with IP addresses and subnets, convert CIDR ranges, expand IPv6 addresses, and look up ports. Live checks look up DNS records, HTTP headers, redirect chains and SSL certificates for any public site.
Subnet and address tools run in your browser. The live checks run on PithLab's server, say so on the page, and never reach private or internal addresses.
Popular network tools
IP Address ConverterConvert IP addresses between dotted, integer, hex, binary and octal.Subnet CalculatorWork out network, broadcast and host range for any IPv4 CIDR block.DNS LookupSee every DNS record for a domain, with TTLs.SSL Certificate CheckerCheck a site's certificate expiry, chain and trust.HTTP Header CheckerFetch a URL and see its status code and response headers.IPv6 Expand and CompressExpand, compress and validate IPv6 addresses and prefixes.
More network tools
CIDR to IP Range ConverterConvert between CIDR blocks and IP ranges, merge CIDRs and expand ranges.Domain WHOIS LookupRegistrar, dates, status and nameservers for a domain or IP.Email Authentication CheckerCheck SPF, DKIM, DMARC, MTA-STS and BIMI for a domain.MAC Address GeneratorGenerate random MAC addresses or reformat and inspect existing ones.Port Number LookupFind the service behind a TCP or UDP port, with security notes.Redirect CheckerFollow a URL's redirects and unshorten short links.Reverse DNS LookupFind the PTR host name for an IP and check it points back.What Is My IP?Your public IP address, as websites see it.