Network Tools
Look up DNS, WHOIS, and SPF, DKIM and DMARC records, calculate subnets, convert IP addresses, find postal codes, and validate IBANs.
Network Tools tools
Network and Data Validation Tools Explained
The first half of this category deals with addresses. The IPv4 Subnet Calculator takes an address and CIDR prefix, such as 192.168.1.0/24, and returns the network, broadcast address and usable host range. A /24 network has 254 usable hosts. To list every address in a block, use the IPv4 Range Expander. The MAC Address Lookup finds the maker of a device from the first half of its MAC address, called the OUI.
The rest of the category checks everyday data before it goes into a database. The IBAN Validator confirms the check digits of an international bank account number and splits out the country and bank code. It checks the format, not whether the account exists.
The Phone Number Parser detects the country and converts numbers to the E.164 format, such as +14155550123. The Email Normalizer trims and lowercases a list of addresses. For Gmail, it also removes dots and plus tags, which helps you spot duplicate sign-ups.