IPv4/IPv6 subnet calculator GestióIP
IP address management software


IPv4 IPv6
IP address
Prefix length   

IP addressfc00::/7
typeUnique-Local Unicast (Unique Local Address (ULA)) (fc00::/7) [rfc4193][IANA]
networkfc00::
Prefix length7
network range
fc00:0000:0000:0000:0000:0000:0000:0000-
fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
total IP addresses2658455991569831745807614120560689152

IP address (full)fc00:0000:0000:0000:0000:0000:0000:0000
integer ID334965454937798799971759379190646833152
hexadecimal ID0xfc000000000000000000000000000000
dotted decimal ID252.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0
base 85 ID
binary ID
11111100000000000000000000000000...
ip6.arpa Format
0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.c.f.ip6.arpa
MS ipv6.literal.netfc00--.ipv6-literal.net


subnet-level I

IPv4/IPv6 subnet calculator and hierarchical IPv6 addressing plan builder

This is the online version of GestióIPv3's embedded subnet calculator. GestióIP is a free, web-based IP address management software.

To calculate an IP address select the IP version, introduce an IP address, choose a bitmask/prefix length and click "calculate".

In addition to the standard subnet calculator functions it can also be helpful in configuring IPv6 reverse DNS delegation as well as it can be used as IP address converter. It accepts the following IP address formats as input: dot-decimal notation (IPv4), colon-hexadecimal notation (IPv6), binary, integer, hexadecimal.

The subnet calculator includes an advanced IPv6 addressing plan builder which permits to create organization specific hierarchical IPv6 address allocation schemes. Read more...





For suggestions, comments or bugs relating to the subnet calculator mail to subnet_calculator@gestioip.net


last change: 28/01/2021







Online Subnet Calculator GestióIP Copyright © Marc Uebel 2017