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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)10.3.192.0/20
network10.3.192.0/20
broadcast10.3.207.255
first host10.3.192.1
last host10.3.207.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.3.192.0/20
address00001010.00000011.11000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000011.11000000.00000000
broadcast00001010.00000011.11001111.11111111
green = network part, grey = host part
hex0x0a03c000
decimal168017920
reverse dns0.192.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:c000

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.192.0/2610.3.192.1 – 10.3.192.6210.3.192.63
210.3.192.64/2610.3.192.65 – 10.3.192.12610.3.192.127
310.3.192.128/2610.3.192.129 – 10.3.192.19010.3.192.191
410.3.192.192/2610.3.192.193 – 10.3.192.25410.3.192.255
510.3.193.0/2610.3.193.1 – 10.3.193.6210.3.193.63
610.3.193.64/2610.3.193.65 – 10.3.193.12610.3.193.127
710.3.193.128/2610.3.193.129 – 10.3.193.19010.3.193.191
810.3.193.192/2610.3.193.193 – 10.3.193.25410.3.193.255
910.3.194.0/2610.3.194.1 – 10.3.194.6210.3.194.63
1010.3.194.64/2610.3.194.65 – 10.3.194.12610.3.194.127
1110.3.194.128/2610.3.194.129 – 10.3.194.19010.3.194.191
1210.3.194.192/2610.3.194.193 – 10.3.194.25410.3.194.255
1310.3.195.0/2610.3.195.1 – 10.3.195.6210.3.195.63
1410.3.195.64/2610.3.195.65 – 10.3.195.12610.3.195.127
1510.3.195.128/2610.3.195.129 – 10.3.195.19010.3.195.191
1610.3.195.192/2610.3.195.193 – 10.3.195.25410.3.195.255
1710.3.196.0/2610.3.196.1 – 10.3.196.6210.3.196.63
1810.3.196.64/2610.3.196.65 – 10.3.196.12610.3.196.127
1910.3.196.128/2610.3.196.129 – 10.3.196.19010.3.196.191
2010.3.196.192/2610.3.196.193 – 10.3.196.25410.3.196.255
2110.3.197.0/2610.3.197.1 – 10.3.197.6210.3.197.63
2210.3.197.64/2610.3.197.65 – 10.3.197.12610.3.197.127
2310.3.197.128/2610.3.197.129 – 10.3.197.19010.3.197.191
2410.3.197.192/2610.3.197.193 – 10.3.197.25410.3.197.255
2510.3.198.0/2610.3.198.1 – 10.3.198.6210.3.198.63
2610.3.198.64/2610.3.198.65 – 10.3.198.12610.3.198.127
2710.3.198.128/2610.3.198.129 – 10.3.198.19010.3.198.191
2810.3.198.192/2610.3.198.193 – 10.3.198.25410.3.198.255
2910.3.199.0/2610.3.199.1 – 10.3.199.6210.3.199.63
3010.3.199.64/2610.3.199.65 – 10.3.199.12610.3.199.127
3110.3.199.128/2610.3.199.129 – 10.3.199.19010.3.199.191
3210.3.199.192/2610.3.199.193 – 10.3.199.25410.3.199.255
3310.3.200.0/2610.3.200.1 – 10.3.200.6210.3.200.63
3410.3.200.64/2610.3.200.65 – 10.3.200.12610.3.200.127
3510.3.200.128/2610.3.200.129 – 10.3.200.19010.3.200.191
3610.3.200.192/2610.3.200.193 – 10.3.200.25410.3.200.255
3710.3.201.0/2610.3.201.1 – 10.3.201.6210.3.201.63
3810.3.201.64/2610.3.201.65 – 10.3.201.12610.3.201.127
3910.3.201.128/2610.3.201.129 – 10.3.201.19010.3.201.191
4010.3.201.192/2610.3.201.193 – 10.3.201.25410.3.201.255
4110.3.202.0/2610.3.202.1 – 10.3.202.6210.3.202.63
4210.3.202.64/2610.3.202.65 – 10.3.202.12610.3.202.127
4310.3.202.128/2610.3.202.129 – 10.3.202.19010.3.202.191
4410.3.202.192/2610.3.202.193 – 10.3.202.25410.3.202.255
4510.3.203.0/2610.3.203.1 – 10.3.203.6210.3.203.63
4610.3.203.64/2610.3.203.65 – 10.3.203.12610.3.203.127
4710.3.203.128/2610.3.203.129 – 10.3.203.19010.3.203.191
4810.3.203.192/2610.3.203.193 – 10.3.203.25410.3.203.255
4910.3.204.0/2610.3.204.1 – 10.3.204.6210.3.204.63
5010.3.204.64/2610.3.204.65 – 10.3.204.12610.3.204.127
5110.3.204.128/2610.3.204.129 – 10.3.204.19010.3.204.191
5210.3.204.192/2610.3.204.193 – 10.3.204.25410.3.204.255
5310.3.205.0/2610.3.205.1 – 10.3.205.6210.3.205.63
5410.3.205.64/2610.3.205.65 – 10.3.205.12610.3.205.127
5510.3.205.128/2610.3.205.129 – 10.3.205.19010.3.205.191
5610.3.205.192/2610.3.205.193 – 10.3.205.25410.3.205.255
5710.3.206.0/2610.3.206.1 – 10.3.206.6210.3.206.63
5810.3.206.64/2610.3.206.65 – 10.3.206.12610.3.206.127
5910.3.206.128/2610.3.206.129 – 10.3.206.19010.3.206.191
6010.3.206.192/2610.3.206.193 – 10.3.206.25410.3.206.255
6110.3.207.0/2610.3.207.1 – 10.3.207.6210.3.207.63
6210.3.207.64/2610.3.207.65 – 10.3.207.12610.3.207.127
6310.3.207.128/2610.3.207.129 – 10.3.207.19010.3.207.191
6410.3.207.192/2610.3.207.193 – 10.3.207.25410.3.207.255
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 →