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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)10.40.0.0/16
network10.40.0.0/16
broadcast10.40.255.255
first host10.40.0.1
last host10.40.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.40.0.0/16
address00001010.00101000.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.00101000.00000000.00000000
broadcast00001010.00101000.11111111.11111111
green = network part, grey = host part
hex0x0a280000
decimal170393600
reverse dns0.0.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:0

/16 split into /22 · 64 subnets

close ×
#networkhost rangebroadcast
110.40.0.0/2210.40.0.1 – 10.40.3.25410.40.3.255
210.40.4.0/2210.40.4.1 – 10.40.7.25410.40.7.255
310.40.8.0/2210.40.8.1 – 10.40.11.25410.40.11.255
410.40.12.0/2210.40.12.1 – 10.40.15.25410.40.15.255
510.40.16.0/2210.40.16.1 – 10.40.19.25410.40.19.255
610.40.20.0/2210.40.20.1 – 10.40.23.25410.40.23.255
710.40.24.0/2210.40.24.1 – 10.40.27.25410.40.27.255
810.40.28.0/2210.40.28.1 – 10.40.31.25410.40.31.255
910.40.32.0/2210.40.32.1 – 10.40.35.25410.40.35.255
1010.40.36.0/2210.40.36.1 – 10.40.39.25410.40.39.255
1110.40.40.0/2210.40.40.1 – 10.40.43.25410.40.43.255
1210.40.44.0/2210.40.44.1 – 10.40.47.25410.40.47.255
1310.40.48.0/2210.40.48.1 – 10.40.51.25410.40.51.255
1410.40.52.0/2210.40.52.1 – 10.40.55.25410.40.55.255
1510.40.56.0/2210.40.56.1 – 10.40.59.25410.40.59.255
1610.40.60.0/2210.40.60.1 – 10.40.63.25410.40.63.255
1710.40.64.0/2210.40.64.1 – 10.40.67.25410.40.67.255
1810.40.68.0/2210.40.68.1 – 10.40.71.25410.40.71.255
1910.40.72.0/2210.40.72.1 – 10.40.75.25410.40.75.255
2010.40.76.0/2210.40.76.1 – 10.40.79.25410.40.79.255
2110.40.80.0/2210.40.80.1 – 10.40.83.25410.40.83.255
2210.40.84.0/2210.40.84.1 – 10.40.87.25410.40.87.255
2310.40.88.0/2210.40.88.1 – 10.40.91.25410.40.91.255
2410.40.92.0/2210.40.92.1 – 10.40.95.25410.40.95.255
2510.40.96.0/2210.40.96.1 – 10.40.99.25410.40.99.255
2610.40.100.0/2210.40.100.1 – 10.40.103.25410.40.103.255
2710.40.104.0/2210.40.104.1 – 10.40.107.25410.40.107.255
2810.40.108.0/2210.40.108.1 – 10.40.111.25410.40.111.255
2910.40.112.0/2210.40.112.1 – 10.40.115.25410.40.115.255
3010.40.116.0/2210.40.116.1 – 10.40.119.25410.40.119.255
3110.40.120.0/2210.40.120.1 – 10.40.123.25410.40.123.255
3210.40.124.0/2210.40.124.1 – 10.40.127.25410.40.127.255
3310.40.128.0/2210.40.128.1 – 10.40.131.25410.40.131.255
3410.40.132.0/2210.40.132.1 – 10.40.135.25410.40.135.255
3510.40.136.0/2210.40.136.1 – 10.40.139.25410.40.139.255
3610.40.140.0/2210.40.140.1 – 10.40.143.25410.40.143.255
3710.40.144.0/2210.40.144.1 – 10.40.147.25410.40.147.255
3810.40.148.0/2210.40.148.1 – 10.40.151.25410.40.151.255
3910.40.152.0/2210.40.152.1 – 10.40.155.25410.40.155.255
4010.40.156.0/2210.40.156.1 – 10.40.159.25410.40.159.255
4110.40.160.0/2210.40.160.1 – 10.40.163.25410.40.163.255
4210.40.164.0/2210.40.164.1 – 10.40.167.25410.40.167.255
4310.40.168.0/2210.40.168.1 – 10.40.171.25410.40.171.255
4410.40.172.0/2210.40.172.1 – 10.40.175.25410.40.175.255
4510.40.176.0/2210.40.176.1 – 10.40.179.25410.40.179.255
4610.40.180.0/2210.40.180.1 – 10.40.183.25410.40.183.255
4710.40.184.0/2210.40.184.1 – 10.40.187.25410.40.187.255
4810.40.188.0/2210.40.188.1 – 10.40.191.25410.40.191.255
4910.40.192.0/2210.40.192.1 – 10.40.195.25410.40.195.255
5010.40.196.0/2210.40.196.1 – 10.40.199.25410.40.199.255
5110.40.200.0/2210.40.200.1 – 10.40.203.25410.40.203.255
5210.40.204.0/2210.40.204.1 – 10.40.207.25410.40.207.255
5310.40.208.0/2210.40.208.1 – 10.40.211.25410.40.211.255
5410.40.212.0/2210.40.212.1 – 10.40.215.25410.40.215.255
5510.40.216.0/2210.40.216.1 – 10.40.219.25410.40.219.255
5610.40.220.0/2210.40.220.1 – 10.40.223.25410.40.223.255
5710.40.224.0/2210.40.224.1 – 10.40.227.25410.40.227.255
5810.40.228.0/2210.40.228.1 – 10.40.231.25410.40.231.255
5910.40.232.0/2210.40.232.1 – 10.40.235.25410.40.235.255
6010.40.236.0/2210.40.236.1 – 10.40.239.25410.40.239.255
6110.40.240.0/2210.40.240.1 – 10.40.243.25410.40.243.255
6210.40.244.0/2210.40.244.1 – 10.40.247.25410.40.247.255
6310.40.248.0/2210.40.248.1 – 10.40.251.25410.40.251.255
6410.40.252.0/2210.40.252.1 – 10.40.255.25410.40.255.255
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 →