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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)10.1.128.0/17
network10.1.128.0/17
broadcast10.1.255.255
first host10.1.128.1
last host10.1.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.1.128.0/17
address00001010.00000001.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00000001.10000000.00000000
broadcast00001010.00000001.11111111.11111111
green = network part, grey = host part
hex0x0a018000
decimal167870464
reverse dns0.128.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.128.0/2310.1.128.1 – 10.1.129.25410.1.129.255
210.1.130.0/2310.1.130.1 – 10.1.131.25410.1.131.255
310.1.132.0/2310.1.132.1 – 10.1.133.25410.1.133.255
410.1.134.0/2310.1.134.1 – 10.1.135.25410.1.135.255
510.1.136.0/2310.1.136.1 – 10.1.137.25410.1.137.255
610.1.138.0/2310.1.138.1 – 10.1.139.25410.1.139.255
710.1.140.0/2310.1.140.1 – 10.1.141.25410.1.141.255
810.1.142.0/2310.1.142.1 – 10.1.143.25410.1.143.255
910.1.144.0/2310.1.144.1 – 10.1.145.25410.1.145.255
1010.1.146.0/2310.1.146.1 – 10.1.147.25410.1.147.255
1110.1.148.0/2310.1.148.1 – 10.1.149.25410.1.149.255
1210.1.150.0/2310.1.150.1 – 10.1.151.25410.1.151.255
1310.1.152.0/2310.1.152.1 – 10.1.153.25410.1.153.255
1410.1.154.0/2310.1.154.1 – 10.1.155.25410.1.155.255
1510.1.156.0/2310.1.156.1 – 10.1.157.25410.1.157.255
1610.1.158.0/2310.1.158.1 – 10.1.159.25410.1.159.255
1710.1.160.0/2310.1.160.1 – 10.1.161.25410.1.161.255
1810.1.162.0/2310.1.162.1 – 10.1.163.25410.1.163.255
1910.1.164.0/2310.1.164.1 – 10.1.165.25410.1.165.255
2010.1.166.0/2310.1.166.1 – 10.1.167.25410.1.167.255
2110.1.168.0/2310.1.168.1 – 10.1.169.25410.1.169.255
2210.1.170.0/2310.1.170.1 – 10.1.171.25410.1.171.255
2310.1.172.0/2310.1.172.1 – 10.1.173.25410.1.173.255
2410.1.174.0/2310.1.174.1 – 10.1.175.25410.1.175.255
2510.1.176.0/2310.1.176.1 – 10.1.177.25410.1.177.255
2610.1.178.0/2310.1.178.1 – 10.1.179.25410.1.179.255
2710.1.180.0/2310.1.180.1 – 10.1.181.25410.1.181.255
2810.1.182.0/2310.1.182.1 – 10.1.183.25410.1.183.255
2910.1.184.0/2310.1.184.1 – 10.1.185.25410.1.185.255
3010.1.186.0/2310.1.186.1 – 10.1.187.25410.1.187.255
3110.1.188.0/2310.1.188.1 – 10.1.189.25410.1.189.255
3210.1.190.0/2310.1.190.1 – 10.1.191.25410.1.191.255
3310.1.192.0/2310.1.192.1 – 10.1.193.25410.1.193.255
3410.1.194.0/2310.1.194.1 – 10.1.195.25410.1.195.255
3510.1.196.0/2310.1.196.1 – 10.1.197.25410.1.197.255
3610.1.198.0/2310.1.198.1 – 10.1.199.25410.1.199.255
3710.1.200.0/2310.1.200.1 – 10.1.201.25410.1.201.255
3810.1.202.0/2310.1.202.1 – 10.1.203.25410.1.203.255
3910.1.204.0/2310.1.204.1 – 10.1.205.25410.1.205.255
4010.1.206.0/2310.1.206.1 – 10.1.207.25410.1.207.255
4110.1.208.0/2310.1.208.1 – 10.1.209.25410.1.209.255
4210.1.210.0/2310.1.210.1 – 10.1.211.25410.1.211.255
4310.1.212.0/2310.1.212.1 – 10.1.213.25410.1.213.255
4410.1.214.0/2310.1.214.1 – 10.1.215.25410.1.215.255
4510.1.216.0/2310.1.216.1 – 10.1.217.25410.1.217.255
4610.1.218.0/2310.1.218.1 – 10.1.219.25410.1.219.255
4710.1.220.0/2310.1.220.1 – 10.1.221.25410.1.221.255
4810.1.222.0/2310.1.222.1 – 10.1.223.25410.1.223.255
4910.1.224.0/2310.1.224.1 – 10.1.225.25410.1.225.255
5010.1.226.0/2310.1.226.1 – 10.1.227.25410.1.227.255
5110.1.228.0/2310.1.228.1 – 10.1.229.25410.1.229.255
5210.1.230.0/2310.1.230.1 – 10.1.231.25410.1.231.255
5310.1.232.0/2310.1.232.1 – 10.1.233.25410.1.233.255
5410.1.234.0/2310.1.234.1 – 10.1.235.25410.1.235.255
5510.1.236.0/2310.1.236.1 – 10.1.237.25410.1.237.255
5610.1.238.0/2310.1.238.1 – 10.1.239.25410.1.239.255
5710.1.240.0/2310.1.240.1 – 10.1.241.25410.1.241.255
5810.1.242.0/2310.1.242.1 – 10.1.243.25410.1.243.255
5910.1.244.0/2310.1.244.1 – 10.1.245.25410.1.245.255
6010.1.246.0/2310.1.246.1 – 10.1.247.25410.1.247.255
6110.1.248.0/2310.1.248.1 – 10.1.249.25410.1.249.255
6210.1.250.0/2310.1.250.1 – 10.1.251.25410.1.251.255
6310.1.252.0/2310.1.252.1 – 10.1.253.25410.1.253.255
6410.1.254.0/2310.1.254.1 – 10.1.255.25410.1.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /17
/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-
/17255.255.128.032,76832,7661
/18255.255.192.016,38416,3822 split →
/19255.255.224.08,1928,1904 split →
/20255.255.240.04,0964,0948 split →
/21255.255.248.02,0482,04616 split →
/22255.255.252.01,0241,02232 split →
/23255.255.254.051251064 split →
/24255.255.255.0256254128 split →
/25255.255.255.128128126256 split →
/26255.255.255.1926462512 split →
/27255.255.255.22432301,024 split →
/28255.255.255.24016142,048 split →
/29255.255.255.248864,096 split →
/30255.255.255.252428,192 split →
/31255.255.255.2542216,384 split →
/32255.255.255.2551132,768 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 →