Category
Network
IPv4 addressing, subnetting, and network operations utilities.
IPv4 Address Converter
Convert an IPv4 address between dotted-decimal, 32-bit integer, hexadecimal, binary, octal, and its in-addr.arpa reverse-DNS name.
IPv4 Address Membership
Check which CIDR blocks from a list contain a given IPv4 address, with the longest-prefix match highlighted.
IPv4 CIDR Aggregator
Collapse a list of IPv4 addresses and CIDR blocks into the smallest equivalent set of CIDR blocks.
IPv4 CIDR Calculator
Calculate one or many IPv4 subnets from CIDR, subnet mask, or wildcard mask notation.
IPv4 DHCP Pool Planner
Plan a DHCP scope for an IPv4 subnet: gateway, usable range, and a pool that skips the gateway and reserved static addresses.
IPv4 Enclosing CIDR
Find the single smallest IPv4 CIDR block that contains every address and block in a list, and see how much of it is wasted.
IPv4 Free Space Finder
Given a parent IPv4 network and its existing allocations, list the unallocated CIDR blocks and the utilization.
IPv4 List Deduplicator
Normalize, sort, and de-duplicate a list of IPv4 addresses and CIDR blocks — optionally dropping contained blocks or aggregating.
IPv4 List Diff
Compare two lists of IPv4 addresses and CIDR blocks as sets: what only list A covers, what only list B covers, and the overlap.
IPv4 Netmask Converter
Convert between CIDR prefix length, dotted subnet mask, wildcard mask, and hex — with address and usable-host counts.
IPv4 Overlap Checker
Check a list of IPv4 CIDR blocks for overlaps and report every conflicting pair with its containment relationship.
IPv4 Range ⇄ CIDR
Turn a start–end IPv4 address range into the smallest list of CIDR blocks, or expand a CIDR block back into its address range.
IPv4 Scope & Special-Use Lookup
Classify an IPv4 address or block against the IANA special-purpose registry: private, CGNAT, loopback, documentation, multicast, reserved, or globally reachable.
IPv4 Subnet Splitter
Divide an IPv4 network into equal-size subnets by target prefix, number of subnets, or required hosts per subnet. Equal-size splitting only — not variable-length (VLSM) allocation.