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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)10.128.0.0/16
network10.128.0.0/16
broadcast10.128.255.255
first host10.128.0.1
last host10.128.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.128.0.0/16
address00001010.10000000.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.10000000.00000000.00000000
broadcast00001010.10000000.11111111.11111111
green = network part, grey = host part
hex0x0a800000
decimal176160768
reverse dns0.0.128.10.in-addr.arpa
ipv4-mapped::ffff:a80:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.128.0.0/2210.128.0.1 – 10.128.3.25410.128.3.255
210.128.4.0/2210.128.4.1 – 10.128.7.25410.128.7.255
310.128.8.0/2210.128.8.1 – 10.128.11.25410.128.11.255
410.128.12.0/2210.128.12.1 – 10.128.15.25410.128.15.255
510.128.16.0/2210.128.16.1 – 10.128.19.25410.128.19.255
610.128.20.0/2210.128.20.1 – 10.128.23.25410.128.23.255
710.128.24.0/2210.128.24.1 – 10.128.27.25410.128.27.255
810.128.28.0/2210.128.28.1 – 10.128.31.25410.128.31.255
910.128.32.0/2210.128.32.1 – 10.128.35.25410.128.35.255
1010.128.36.0/2210.128.36.1 – 10.128.39.25410.128.39.255
1110.128.40.0/2210.128.40.1 – 10.128.43.25410.128.43.255
1210.128.44.0/2210.128.44.1 – 10.128.47.25410.128.47.255
1310.128.48.0/2210.128.48.1 – 10.128.51.25410.128.51.255
1410.128.52.0/2210.128.52.1 – 10.128.55.25410.128.55.255
1510.128.56.0/2210.128.56.1 – 10.128.59.25410.128.59.255
1610.128.60.0/2210.128.60.1 – 10.128.63.25410.128.63.255
1710.128.64.0/2210.128.64.1 – 10.128.67.25410.128.67.255
1810.128.68.0/2210.128.68.1 – 10.128.71.25410.128.71.255
1910.128.72.0/2210.128.72.1 – 10.128.75.25410.128.75.255
2010.128.76.0/2210.128.76.1 – 10.128.79.25410.128.79.255
2110.128.80.0/2210.128.80.1 – 10.128.83.25410.128.83.255
2210.128.84.0/2210.128.84.1 – 10.128.87.25410.128.87.255
2310.128.88.0/2210.128.88.1 – 10.128.91.25410.128.91.255
2410.128.92.0/2210.128.92.1 – 10.128.95.25410.128.95.255
2510.128.96.0/2210.128.96.1 – 10.128.99.25410.128.99.255
2610.128.100.0/2210.128.100.1 – 10.128.103.25410.128.103.255
2710.128.104.0/2210.128.104.1 – 10.128.107.25410.128.107.255
2810.128.108.0/2210.128.108.1 – 10.128.111.25410.128.111.255
2910.128.112.0/2210.128.112.1 – 10.128.115.25410.128.115.255
3010.128.116.0/2210.128.116.1 – 10.128.119.25410.128.119.255
3110.128.120.0/2210.128.120.1 – 10.128.123.25410.128.123.255
3210.128.124.0/2210.128.124.1 – 10.128.127.25410.128.127.255
3310.128.128.0/2210.128.128.1 – 10.128.131.25410.128.131.255
3410.128.132.0/2210.128.132.1 – 10.128.135.25410.128.135.255
3510.128.136.0/2210.128.136.1 – 10.128.139.25410.128.139.255
3610.128.140.0/2210.128.140.1 – 10.128.143.25410.128.143.255
3710.128.144.0/2210.128.144.1 – 10.128.147.25410.128.147.255
3810.128.148.0/2210.128.148.1 – 10.128.151.25410.128.151.255
3910.128.152.0/2210.128.152.1 – 10.128.155.25410.128.155.255
4010.128.156.0/2210.128.156.1 – 10.128.159.25410.128.159.255
4110.128.160.0/2210.128.160.1 – 10.128.163.25410.128.163.255
4210.128.164.0/2210.128.164.1 – 10.128.167.25410.128.167.255
4310.128.168.0/2210.128.168.1 – 10.128.171.25410.128.171.255
4410.128.172.0/2210.128.172.1 – 10.128.175.25410.128.175.255
4510.128.176.0/2210.128.176.1 – 10.128.179.25410.128.179.255
4610.128.180.0/2210.128.180.1 – 10.128.183.25410.128.183.255
4710.128.184.0/2210.128.184.1 – 10.128.187.25410.128.187.255
4810.128.188.0/2210.128.188.1 – 10.128.191.25410.128.191.255
4910.128.192.0/2210.128.192.1 – 10.128.195.25410.128.195.255
5010.128.196.0/2210.128.196.1 – 10.128.199.25410.128.199.255
5110.128.200.0/2210.128.200.1 – 10.128.203.25410.128.203.255
5210.128.204.0/2210.128.204.1 – 10.128.207.25410.128.207.255
5310.128.208.0/2210.128.208.1 – 10.128.211.25410.128.211.255
5410.128.212.0/2210.128.212.1 – 10.128.215.25410.128.215.255
5510.128.216.0/2210.128.216.1 – 10.128.219.25410.128.219.255
5610.128.220.0/2210.128.220.1 – 10.128.223.25410.128.223.255
5710.128.224.0/2210.128.224.1 – 10.128.227.25410.128.227.255
5810.128.228.0/2210.128.228.1 – 10.128.231.25410.128.231.255
5910.128.232.0/2210.128.232.1 – 10.128.235.25410.128.235.255
6010.128.236.0/2210.128.236.1 – 10.128.239.25410.128.239.255
6110.128.240.0/2210.128.240.1 – 10.128.243.25410.128.243.255
6210.128.244.0/2210.128.244.1 – 10.128.247.25410.128.247.255
6310.128.248.0/2210.128.248.1 – 10.128.251.25410.128.251.255
6410.128.252.0/2210.128.252.1 – 10.128.255.25410.128.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /16
/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-
/16255.255.0.065,53665,5341
/17255.255.128.032,76832,7662 split →
/18255.255.192.016,38416,3824 split →
/19255.255.224.08,1928,1908 split →
/20255.255.240.04,0964,09416 split →
/21255.255.248.02,0482,04632 split →
/22255.255.252.01,0241,02264 split →
/23255.255.254.0512510128 split →
/24255.255.255.0256254256 split →
/25255.255.255.128128126512 split →
/26255.255.255.19264621,024 split →
/27255.255.255.22432302,048 split →
/28255.255.255.24016144,096 split →
/29255.255.255.248868,192 split →
/30255.255.255.2524216,384 split →
/31255.255.255.2542232,768 split →
/32255.255.255.2551165,536 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 →