IPv6 Calculator

Calculate IPv6 subnets, expand/compress addresses, and plan your IPv6 network architecture.

IPv6 Subnet Calculator

Calculate network details for any IPv6 prefix

IPv6 Address/Prefix

Prefix Length

Show binary

Show EUI-64 format

IPv6 Address Converter

Convert between different IPv6 representations

Full Address

Compressed

Expanded

IPv4-mapped

IPv6 Expand/Compress

Expand compressed IPv6 addresses or compress expanded ones

IPv6 Address

Expanded Address

IPv6 Range Calculator

Calculate the range of addresses in a subnet

Network Address

First Address

Last Address

Total Addresses

Prefix Visualization

About IPv6

IPv6 is the most recent version of the Internet Protocol, designed to replace IPv4. It provides 128-bit addressing, vastly expanding the available address space.

IPv6 Address Format

IPv6 addresses are represented as eight groups of four hexadecimal digits, separated by colons. Example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334

IPv6 Prefix Lengths

Prefix	Subnet Size	Use Case
/32	2⁹⁶ addresses	ISP allocation (typical)
/48	2⁸⁰ addresses	Site allocation (typical)
/56	2⁷² addresses	Small site / home
/64	2⁶⁴ addresses	Standard subnet (SLAAC)
/112	2¹⁶ addresses	Point-to-point links
/127	2 addresses	Point-to-point (RFC 6164)
/128	1 address	Host address

Special IPv6 Addresses

Address	Description
::/128	Unspecified address
::1/128	Loopback address
fe80::/10	Link-local addresses
fc00::/7	Unique local addresses (ULA)
ff00::/8	Multicast addresses
2001:db8::/32	Documentation (RFC 3849)