IP Tools

Parse an IP with a prefix length or netmask (e.g. 192.0.2.0/24 or 192.0.2.0/255.255.255.0). Shows the first and last usable address, the network and broadcast addresses (IPv4) or short/long form of the prefix (IPv6), and the netmask ↔ CIDR equivalent.
IP/CIDR
Convert between an IP address and its reverse-DNS name. Paste an IP to get the .in-addr.arpa (IPv4) or .ip6.arpa (IPv6) name; paste an .arpa name to recover the IP; or paste a CIDR (e.g. 2001:db8::/48) to get the rDNS zone covering that subnet. Useful for setting up PTR records and zone delegations.
IP/rDNS
Convert between an IP address and its numeric forms — hexadecimal (0x…), decimal, binary (0b…), and octal (0o…). Works in any direction: paste any one form and the others fill in. Append a CIDR (e.g. 192.0.2.5/24 or 0xc0000205/24) to highlight network vs host bits in each output.
IP/Number
Carve a parent CIDR into equal-sized subnets. Pick the desired subnet prefix length and every subnet of that size inside the parent block is listed. Output is capped at 2048 subnets to keep the page responsive.
CIDR Prefix
Desired Subnets
Interactively split a CIDR block into a tree of unequal-sized subnets. Click a leaf row to split a /n into two /n+1 halves; click a merged span to merge it back; right-click any cell to cycle through color tags for grouping. Splits and colors are saved in the URL so you can share or bookmark a layout. Reset clears the splits.
CIDR Prefix
Given a first and last IP address, output the minimum set of CIDR blocks that exactly cover that range — no extra addresses, no gaps. Handy when an allocation is described as a range but you need routable prefixes. Both IPs must be the same family (v4 or v6).
First IP
Last IP
Convert sustained bandwidth (mbps) to monthly data transfer (GB), and back. Assumes a 30.5-day month running 24/7 at the given rate. Useful for sizing a transit/CDN bill against a port speed.
mbps
GB/mo

Welcome! This is an all-in-one networking utility made by RaidAndFade.
If you have any suggestions please feel free to make a PR or Issue on the Github Repo.
Keep up with my projects on Discord. https://discord.gg/aEyewR5J
Check out Xenyth Cloud, AS835, and GoCodeIT

Tips and Tricks for IP Tools:

  • Your link stores your input! Share your input with others or save it for later.
  • Both ipv4.tools and ipv6.tools support IPv4 and IPv6, the name is just cosmetic.
  • The site uses service workers, and is fully self-contained. You can use it offline after first load!