UUID Studio

UUID Studio

IPv4 Subnet Calculator

Calculate network, broadcast, mask, and host range from CIDR.

  • đź”’ No data stored or uploaded
  • ⚡ 100% client-side
  • 🆓 Free, no account
Click Convert when ready

Override only when Auto cannot parse your paste. Changing this loads a matching sample into Input — click Convert to run. Use Load sample to cycle every format example.

All conversions

Read-only representations of the same 16 bytes. Every textual form is listed here, not in “Prefer format”.

Paste two values: if both sides are valid JSON, a structural diff appears; otherwise UUID / bytes are compared when both decode to the same format.

A
B

Create or edit JSON here (syntax colors), then format, validate, or convert - same as MongoDB $binary UUID blobs on the Convert tab once detected.

New document

Hash, HMAC, AES-GCM/CBC + RSA-OAEP, codecs, JWT decoding, UUID v4, and secure random - all client-side. JWTs use Base64URL (three segments), not a single MIME Base64 block - use Decode JWT below, not raw Base64 decode.

Examples

  • Class C /24 
    192.168.1.0/24
  • Small /28 block 
    10.0.0.0/28

About IPv4 Subnet Calculator

Reading `/24` off a CIDR block and knowing exactly which addresses that covers - network address, broadcast address, first and last usable host - is a calculation most engineers redo by hand more often than they'd like, especially for less common prefixes like /27 or /29.

Paste an address in CIDR notation and get the subnet mask, network and broadcast addresses, total address count, and the usable host range - the same numbers you'd otherwise work out with binary math and a subnet cheat sheet.

FAQ

Does it support IPv6?
No, this calculator is IPv4 only - IPv6 subnetting works differently and deserves its own dedicated tool.