DNS Lookups, Port Checker, Port Scanner, IP Information Gathering, Hash Generation, Blacklist Check, Subnet Calculator and more.. Do you need to port check open ports on a router or remote host to see which ports are open? Check out our free port scanner and port checker tools. Need a DNS checker? Find other useful tools like the CNAME checker and DMARC checker, MX Record Lookup as well as the reverse-lookup and forward-lookup tools. Find IP information gathering tools like the IP subnet calculator, blacklist check and WHOIS IP address lookup. Hash generators are available for MD5 hash, SHA256 hash and SHA1 hash generation. SSL Certificate check added to get certificate info and verify validity of website certificates.