All integrations
NetworkCalc
UtilitiesCompliance & Security
Calculate and plan IPv4 subnets, turn IP ranges into CIDR blocks, look up DNS, WHOIS and SPF records, check a site's TLS certificate expiry, and convert numbers and text between formats, with no account needed.
9 actions
Actions
Steps your workflow can run in NetworkCalc.
Calculate a subnetGet the network and broadcast addresses, masks, usable range and host count for an IPv4 address and subnet size.
Plan subnets (VLSM)Divide a network into right-sized subnets for the devices each one needs, with the space left over.
Convert IP ranges to CIDRTurn IP ranges or lists of blocks into the exact CIDR blocks that cover them, plus the single covering block.
Look up DNS recordsGet a hostname's A, CNAME, MX, NS, SOA and TXT records, or learn that it has none.
Look up domain registration (WHOIS)Get a domain's registrar, registration and expiry dates, and the days left until it expires.
Check an SPF recordValidate a domain's published SPF record, or one you paste in, and count its DNS lookups.
Get a TLS certificateRead the certificate a site serves now: issuer, expiry, days left, covered names and whether it matches the hostname.
Convert a number between basesConvert whole numbers between binary, octal, decimal and hexadecimal, with optional two's complement.
Encode or decode textEncode or decode text as Base64, Base64URL or URL encoding.
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