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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)10.4.128.0/17
network10.4.128.0/17
broadcast10.4.255.255
first host10.4.128.1
last host10.4.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.4.128.0/17
address00001010.00000100.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00000100.10000000.00000000
broadcast00001010.00000100.11111111.11111111
green = network part, grey = host part
hex0x0a048000
decimal168067072
reverse dns0.128.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.128.0/2310.4.128.1 – 10.4.129.25410.4.129.255
210.4.130.0/2310.4.130.1 – 10.4.131.25410.4.131.255
310.4.132.0/2310.4.132.1 – 10.4.133.25410.4.133.255
410.4.134.0/2310.4.134.1 – 10.4.135.25410.4.135.255
510.4.136.0/2310.4.136.1 – 10.4.137.25410.4.137.255
610.4.138.0/2310.4.138.1 – 10.4.139.25410.4.139.255
710.4.140.0/2310.4.140.1 – 10.4.141.25410.4.141.255
810.4.142.0/2310.4.142.1 – 10.4.143.25410.4.143.255
910.4.144.0/2310.4.144.1 – 10.4.145.25410.4.145.255
1010.4.146.0/2310.4.146.1 – 10.4.147.25410.4.147.255
1110.4.148.0/2310.4.148.1 – 10.4.149.25410.4.149.255
1210.4.150.0/2310.4.150.1 – 10.4.151.25410.4.151.255
1310.4.152.0/2310.4.152.1 – 10.4.153.25410.4.153.255
1410.4.154.0/2310.4.154.1 – 10.4.155.25410.4.155.255
1510.4.156.0/2310.4.156.1 – 10.4.157.25410.4.157.255
1610.4.158.0/2310.4.158.1 – 10.4.159.25410.4.159.255
1710.4.160.0/2310.4.160.1 – 10.4.161.25410.4.161.255
1810.4.162.0/2310.4.162.1 – 10.4.163.25410.4.163.255
1910.4.164.0/2310.4.164.1 – 10.4.165.25410.4.165.255
2010.4.166.0/2310.4.166.1 – 10.4.167.25410.4.167.255
2110.4.168.0/2310.4.168.1 – 10.4.169.25410.4.169.255
2210.4.170.0/2310.4.170.1 – 10.4.171.25410.4.171.255
2310.4.172.0/2310.4.172.1 – 10.4.173.25410.4.173.255
2410.4.174.0/2310.4.174.1 – 10.4.175.25410.4.175.255
2510.4.176.0/2310.4.176.1 – 10.4.177.25410.4.177.255
2610.4.178.0/2310.4.178.1 – 10.4.179.25410.4.179.255
2710.4.180.0/2310.4.180.1 – 10.4.181.25410.4.181.255
2810.4.182.0/2310.4.182.1 – 10.4.183.25410.4.183.255
2910.4.184.0/2310.4.184.1 – 10.4.185.25410.4.185.255
3010.4.186.0/2310.4.186.1 – 10.4.187.25410.4.187.255
3110.4.188.0/2310.4.188.1 – 10.4.189.25410.4.189.255
3210.4.190.0/2310.4.190.1 – 10.4.191.25410.4.191.255
3310.4.192.0/2310.4.192.1 – 10.4.193.25410.4.193.255
3410.4.194.0/2310.4.194.1 – 10.4.195.25410.4.195.255
3510.4.196.0/2310.4.196.1 – 10.4.197.25410.4.197.255
3610.4.198.0/2310.4.198.1 – 10.4.199.25410.4.199.255
3710.4.200.0/2310.4.200.1 – 10.4.201.25410.4.201.255
3810.4.202.0/2310.4.202.1 – 10.4.203.25410.4.203.255
3910.4.204.0/2310.4.204.1 – 10.4.205.25410.4.205.255
4010.4.206.0/2310.4.206.1 – 10.4.207.25410.4.207.255
4110.4.208.0/2310.4.208.1 – 10.4.209.25410.4.209.255
4210.4.210.0/2310.4.210.1 – 10.4.211.25410.4.211.255
4310.4.212.0/2310.4.212.1 – 10.4.213.25410.4.213.255
4410.4.214.0/2310.4.214.1 – 10.4.215.25410.4.215.255
4510.4.216.0/2310.4.216.1 – 10.4.217.25410.4.217.255
4610.4.218.0/2310.4.218.1 – 10.4.219.25410.4.219.255
4710.4.220.0/2310.4.220.1 – 10.4.221.25410.4.221.255
4810.4.222.0/2310.4.222.1 – 10.4.223.25410.4.223.255
4910.4.224.0/2310.4.224.1 – 10.4.225.25410.4.225.255
5010.4.226.0/2310.4.226.1 – 10.4.227.25410.4.227.255
5110.4.228.0/2310.4.228.1 – 10.4.229.25410.4.229.255
5210.4.230.0/2310.4.230.1 – 10.4.231.25410.4.231.255
5310.4.232.0/2310.4.232.1 – 10.4.233.25410.4.233.255
5410.4.234.0/2310.4.234.1 – 10.4.235.25410.4.235.255
5510.4.236.0/2310.4.236.1 – 10.4.237.25410.4.237.255
5610.4.238.0/2310.4.238.1 – 10.4.239.25410.4.239.255
5710.4.240.0/2310.4.240.1 – 10.4.241.25410.4.241.255
5810.4.242.0/2310.4.242.1 – 10.4.243.25410.4.243.255
5910.4.244.0/2310.4.244.1 – 10.4.245.25410.4.245.255
6010.4.246.0/2310.4.246.1 – 10.4.247.25410.4.247.255
6110.4.248.0/2310.4.248.1 – 10.4.249.25410.4.249.255
6210.4.250.0/2310.4.250.1 – 10.4.251.25410.4.251.255
6310.4.252.0/2310.4.252.1 – 10.4.253.25410.4.253.255
6410.4.254.0/2310.4.254.1 – 10.4.255.25410.4.255.255
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 →