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IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.12.144.0/20
network10.12.144.0/20
broadcast10.12.159.255
first host10.12.144.1
last host10.12.159.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.12.144.0/20
address00001010.00001100.10010000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001100.10010000.00000000
broadcast00001010.00001100.10011111.11111111
green = network part, grey = host part
hex0x0a0c9000
decimal168595456
reverse dns0.144.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:9000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.144.0/2610.12.144.1 – 10.12.144.6210.12.144.63
210.12.144.64/2610.12.144.65 – 10.12.144.12610.12.144.127
310.12.144.128/2610.12.144.129 – 10.12.144.19010.12.144.191
410.12.144.192/2610.12.144.193 – 10.12.144.25410.12.144.255
510.12.145.0/2610.12.145.1 – 10.12.145.6210.12.145.63
610.12.145.64/2610.12.145.65 – 10.12.145.12610.12.145.127
710.12.145.128/2610.12.145.129 – 10.12.145.19010.12.145.191
810.12.145.192/2610.12.145.193 – 10.12.145.25410.12.145.255
910.12.146.0/2610.12.146.1 – 10.12.146.6210.12.146.63
1010.12.146.64/2610.12.146.65 – 10.12.146.12610.12.146.127
1110.12.146.128/2610.12.146.129 – 10.12.146.19010.12.146.191
1210.12.146.192/2610.12.146.193 – 10.12.146.25410.12.146.255
1310.12.147.0/2610.12.147.1 – 10.12.147.6210.12.147.63
1410.12.147.64/2610.12.147.65 – 10.12.147.12610.12.147.127
1510.12.147.128/2610.12.147.129 – 10.12.147.19010.12.147.191
1610.12.147.192/2610.12.147.193 – 10.12.147.25410.12.147.255
1710.12.148.0/2610.12.148.1 – 10.12.148.6210.12.148.63
1810.12.148.64/2610.12.148.65 – 10.12.148.12610.12.148.127
1910.12.148.128/2610.12.148.129 – 10.12.148.19010.12.148.191
2010.12.148.192/2610.12.148.193 – 10.12.148.25410.12.148.255
2110.12.149.0/2610.12.149.1 – 10.12.149.6210.12.149.63
2210.12.149.64/2610.12.149.65 – 10.12.149.12610.12.149.127
2310.12.149.128/2610.12.149.129 – 10.12.149.19010.12.149.191
2410.12.149.192/2610.12.149.193 – 10.12.149.25410.12.149.255
2510.12.150.0/2610.12.150.1 – 10.12.150.6210.12.150.63
2610.12.150.64/2610.12.150.65 – 10.12.150.12610.12.150.127
2710.12.150.128/2610.12.150.129 – 10.12.150.19010.12.150.191
2810.12.150.192/2610.12.150.193 – 10.12.150.25410.12.150.255
2910.12.151.0/2610.12.151.1 – 10.12.151.6210.12.151.63
3010.12.151.64/2610.12.151.65 – 10.12.151.12610.12.151.127
3110.12.151.128/2610.12.151.129 – 10.12.151.19010.12.151.191
3210.12.151.192/2610.12.151.193 – 10.12.151.25410.12.151.255
3310.12.152.0/2610.12.152.1 – 10.12.152.6210.12.152.63
3410.12.152.64/2610.12.152.65 – 10.12.152.12610.12.152.127
3510.12.152.128/2610.12.152.129 – 10.12.152.19010.12.152.191
3610.12.152.192/2610.12.152.193 – 10.12.152.25410.12.152.255
3710.12.153.0/2610.12.153.1 – 10.12.153.6210.12.153.63
3810.12.153.64/2610.12.153.65 – 10.12.153.12610.12.153.127
3910.12.153.128/2610.12.153.129 – 10.12.153.19010.12.153.191
4010.12.153.192/2610.12.153.193 – 10.12.153.25410.12.153.255
4110.12.154.0/2610.12.154.1 – 10.12.154.6210.12.154.63
4210.12.154.64/2610.12.154.65 – 10.12.154.12610.12.154.127
4310.12.154.128/2610.12.154.129 – 10.12.154.19010.12.154.191
4410.12.154.192/2610.12.154.193 – 10.12.154.25410.12.154.255
4510.12.155.0/2610.12.155.1 – 10.12.155.6210.12.155.63
4610.12.155.64/2610.12.155.65 – 10.12.155.12610.12.155.127
4710.12.155.128/2610.12.155.129 – 10.12.155.19010.12.155.191
4810.12.155.192/2610.12.155.193 – 10.12.155.25410.12.155.255
4910.12.156.0/2610.12.156.1 – 10.12.156.6210.12.156.63
5010.12.156.64/2610.12.156.65 – 10.12.156.12610.12.156.127
5110.12.156.128/2610.12.156.129 – 10.12.156.19010.12.156.191
5210.12.156.192/2610.12.156.193 – 10.12.156.25410.12.156.255
5310.12.157.0/2610.12.157.1 – 10.12.157.6210.12.157.63
5410.12.157.64/2610.12.157.65 – 10.12.157.12610.12.157.127
5510.12.157.128/2610.12.157.129 – 10.12.157.19010.12.157.191
5610.12.157.192/2610.12.157.193 – 10.12.157.25410.12.157.255
5710.12.158.0/2610.12.158.1 – 10.12.158.6210.12.158.63
5810.12.158.64/2610.12.158.65 – 10.12.158.12610.12.158.127
5910.12.158.128/2610.12.158.129 – 10.12.158.19010.12.158.191
6010.12.158.192/2610.12.158.193 – 10.12.158.25410.12.158.255
6110.12.159.0/2610.12.159.1 – 10.12.159.6210.12.159.63
6210.12.159.64/2610.12.159.65 – 10.12.159.12610.12.159.127
6310.12.159.128/2610.12.159.129 – 10.12.159.19010.12.159.191
6410.12.159.192/2610.12.159.193 – 10.12.159.25410.12.159.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /20
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →