IP Addressing Calculators
25 free ip addressing calculators in Networking. The first 1 has a full write-up: the method, a worked example and questions specific to that calculator.
- Subnet CalculatorDivide an IP network into subnets and view addressing details for each resulting subnet.
- 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 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.