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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)10.115.0.0/16
network10.115.0.0/16
broadcast10.115.255.255
first host10.115.0.1
last host10.115.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.115.0.0/16
address00001010.01110011.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.01110011.00000000.00000000
broadcast00001010.01110011.11111111.11111111
green = network part, grey = host part
hex0x0a730000
decimal175308800
reverse dns0.0.115.10.in-addr.arpa
ipv4-mapped::ffff:a73:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.115.0.0/2210.115.0.1 – 10.115.3.25410.115.3.255
210.115.4.0/2210.115.4.1 – 10.115.7.25410.115.7.255
310.115.8.0/2210.115.8.1 – 10.115.11.25410.115.11.255
410.115.12.0/2210.115.12.1 – 10.115.15.25410.115.15.255
510.115.16.0/2210.115.16.1 – 10.115.19.25410.115.19.255
610.115.20.0/2210.115.20.1 – 10.115.23.25410.115.23.255
710.115.24.0/2210.115.24.1 – 10.115.27.25410.115.27.255
810.115.28.0/2210.115.28.1 – 10.115.31.25410.115.31.255
910.115.32.0/2210.115.32.1 – 10.115.35.25410.115.35.255
1010.115.36.0/2210.115.36.1 – 10.115.39.25410.115.39.255
1110.115.40.0/2210.115.40.1 – 10.115.43.25410.115.43.255
1210.115.44.0/2210.115.44.1 – 10.115.47.25410.115.47.255
1310.115.48.0/2210.115.48.1 – 10.115.51.25410.115.51.255
1410.115.52.0/2210.115.52.1 – 10.115.55.25410.115.55.255
1510.115.56.0/2210.115.56.1 – 10.115.59.25410.115.59.255
1610.115.60.0/2210.115.60.1 – 10.115.63.25410.115.63.255
1710.115.64.0/2210.115.64.1 – 10.115.67.25410.115.67.255
1810.115.68.0/2210.115.68.1 – 10.115.71.25410.115.71.255
1910.115.72.0/2210.115.72.1 – 10.115.75.25410.115.75.255
2010.115.76.0/2210.115.76.1 – 10.115.79.25410.115.79.255
2110.115.80.0/2210.115.80.1 – 10.115.83.25410.115.83.255
2210.115.84.0/2210.115.84.1 – 10.115.87.25410.115.87.255
2310.115.88.0/2210.115.88.1 – 10.115.91.25410.115.91.255
2410.115.92.0/2210.115.92.1 – 10.115.95.25410.115.95.255
2510.115.96.0/2210.115.96.1 – 10.115.99.25410.115.99.255
2610.115.100.0/2210.115.100.1 – 10.115.103.25410.115.103.255
2710.115.104.0/2210.115.104.1 – 10.115.107.25410.115.107.255
2810.115.108.0/2210.115.108.1 – 10.115.111.25410.115.111.255
2910.115.112.0/2210.115.112.1 – 10.115.115.25410.115.115.255
3010.115.116.0/2210.115.116.1 – 10.115.119.25410.115.119.255
3110.115.120.0/2210.115.120.1 – 10.115.123.25410.115.123.255
3210.115.124.0/2210.115.124.1 – 10.115.127.25410.115.127.255
3310.115.128.0/2210.115.128.1 – 10.115.131.25410.115.131.255
3410.115.132.0/2210.115.132.1 – 10.115.135.25410.115.135.255
3510.115.136.0/2210.115.136.1 – 10.115.139.25410.115.139.255
3610.115.140.0/2210.115.140.1 – 10.115.143.25410.115.143.255
3710.115.144.0/2210.115.144.1 – 10.115.147.25410.115.147.255
3810.115.148.0/2210.115.148.1 – 10.115.151.25410.115.151.255
3910.115.152.0/2210.115.152.1 – 10.115.155.25410.115.155.255
4010.115.156.0/2210.115.156.1 – 10.115.159.25410.115.159.255
4110.115.160.0/2210.115.160.1 – 10.115.163.25410.115.163.255
4210.115.164.0/2210.115.164.1 – 10.115.167.25410.115.167.255
4310.115.168.0/2210.115.168.1 – 10.115.171.25410.115.171.255
4410.115.172.0/2210.115.172.1 – 10.115.175.25410.115.175.255
4510.115.176.0/2210.115.176.1 – 10.115.179.25410.115.179.255
4610.115.180.0/2210.115.180.1 – 10.115.183.25410.115.183.255
4710.115.184.0/2210.115.184.1 – 10.115.187.25410.115.187.255
4810.115.188.0/2210.115.188.1 – 10.115.191.25410.115.191.255
4910.115.192.0/2210.115.192.1 – 10.115.195.25410.115.195.255
5010.115.196.0/2210.115.196.1 – 10.115.199.25410.115.199.255
5110.115.200.0/2210.115.200.1 – 10.115.203.25410.115.203.255
5210.115.204.0/2210.115.204.1 – 10.115.207.25410.115.207.255
5310.115.208.0/2210.115.208.1 – 10.115.211.25410.115.211.255
5410.115.212.0/2210.115.212.1 – 10.115.215.25410.115.215.255
5510.115.216.0/2210.115.216.1 – 10.115.219.25410.115.219.255
5610.115.220.0/2210.115.220.1 – 10.115.223.25410.115.223.255
5710.115.224.0/2210.115.224.1 – 10.115.227.25410.115.227.255
5810.115.228.0/2210.115.228.1 – 10.115.231.25410.115.231.255
5910.115.232.0/2210.115.232.1 – 10.115.235.25410.115.235.255
6010.115.236.0/2210.115.236.1 – 10.115.239.25410.115.239.255
6110.115.240.0/2210.115.240.1 – 10.115.243.25410.115.243.255
6210.115.244.0/2210.115.244.1 – 10.115.247.25410.115.247.255
6310.115.248.0/2210.115.248.1 – 10.115.251.25410.115.251.255
6410.115.252.0/2210.115.252.1 – 10.115.255.25410.115.255.255
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 →