IP Addressing Calculators

25 free ip addressing calculators in Networking.

Binary IP ConverterConvert an IPv4 address between dotted-decimal and binary notation.
Broadcast Address CalculatorFind the broadcast address of a network from its IP address and subnet mask.
CIDR CalculatorConvert CIDR notation into network address, subnet mask, broadcast address and usable host count.
CIDR Merge CalculatorMerge consecutive CIDR blocks into a single aggregate and check that the starting network is correctly aligned.
Decimal IP ConverterConvert an IPv4 address to and from its 32-bit decimal integer representation.
First Host CalculatorFind the first usable host address in an IP subnet.
FLSM CalculatorSplit a network into equal-sized fixed-length subnets and list each subnet's address range.
Hex IP ConverterConvert an IPv4 or IPv6 address between dotted notation and hexadecimal.
Host Count CalculatorCalculate the number of usable host addresses available in a subnet.
IP Range CalculatorWork out the first and last address of a CIDR block, and how many addresses the range contains.
IPv4 CalculatorCalculate network address, broadcast address, host range and subnet mask for any IPv4 address.
IPv6 CalculatorExpand, compress and analyze IPv6 addresses including prefix and interface identifier breakdown.
Last Host CalculatorFind the last usable host address in an IP subnet.
Network Address CalculatorDetermine the network address of a subnet from an IP address and mask or prefix length.
Network Prefix CalculatorConvert between subnet masks and CIDR prefix lengths in either direction.
Octal IP ConverterConvert an IPv4 address between dotted-decimal and octal notation.
Private/Public IP CalculatorClassify any IPv4 address as private, public, loopback, link-local, CGNAT, multicast or reserved.
Reverse IP Lookup CalculatorGenerate the reverse DNS (PTR) lookup format for an IPv4 or IPv6 address.
Subnet CalculatorDivide an IP network into subnets and view addressing details for each resulting subnet.
Subnet Count CalculatorCalculate how many subnets can be created from a network with a given prefix length.
Subnet Mask CalculatorConvert a CIDR prefix length into its dotted-decimal subnet mask, wildcard mask and usable host count.
Supernet CalculatorAggregate multiple contiguous networks into a single supernet with the smallest matching prefix.
Usable IP CalculatorCount how many addresses in a subnet you can actually assign after network, broadcast and infrastructure reservations.
VLSM CalculatorAllocate variable-length subnets efficiently across a network based on per-subnet host requirements.
Wildcard Mask CalculatorConvert a subnet mask into its wildcard mask equivalent for ACLs and OSPF.