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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)10.23.128.0/17
network10.23.128.0/17
broadcast10.23.255.255
first host10.23.128.1
last host10.23.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.23.128.0/17
address00001010.00010111.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00010111.10000000.00000000
broadcast00001010.00010111.11111111.11111111
green = network part, grey = host part
hex0x0a178000
decimal169312256
reverse dns0.128.23.10.in-addr.arpa
ipv4-mapped::ffff:a17:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.23.128.0/2310.23.128.1 – 10.23.129.25410.23.129.255
210.23.130.0/2310.23.130.1 – 10.23.131.25410.23.131.255
310.23.132.0/2310.23.132.1 – 10.23.133.25410.23.133.255
410.23.134.0/2310.23.134.1 – 10.23.135.25410.23.135.255
510.23.136.0/2310.23.136.1 – 10.23.137.25410.23.137.255
610.23.138.0/2310.23.138.1 – 10.23.139.25410.23.139.255
710.23.140.0/2310.23.140.1 – 10.23.141.25410.23.141.255
810.23.142.0/2310.23.142.1 – 10.23.143.25410.23.143.255
910.23.144.0/2310.23.144.1 – 10.23.145.25410.23.145.255
1010.23.146.0/2310.23.146.1 – 10.23.147.25410.23.147.255
1110.23.148.0/2310.23.148.1 – 10.23.149.25410.23.149.255
1210.23.150.0/2310.23.150.1 – 10.23.151.25410.23.151.255
1310.23.152.0/2310.23.152.1 – 10.23.153.25410.23.153.255
1410.23.154.0/2310.23.154.1 – 10.23.155.25410.23.155.255
1510.23.156.0/2310.23.156.1 – 10.23.157.25410.23.157.255
1610.23.158.0/2310.23.158.1 – 10.23.159.25410.23.159.255
1710.23.160.0/2310.23.160.1 – 10.23.161.25410.23.161.255
1810.23.162.0/2310.23.162.1 – 10.23.163.25410.23.163.255
1910.23.164.0/2310.23.164.1 – 10.23.165.25410.23.165.255
2010.23.166.0/2310.23.166.1 – 10.23.167.25410.23.167.255
2110.23.168.0/2310.23.168.1 – 10.23.169.25410.23.169.255
2210.23.170.0/2310.23.170.1 – 10.23.171.25410.23.171.255
2310.23.172.0/2310.23.172.1 – 10.23.173.25410.23.173.255
2410.23.174.0/2310.23.174.1 – 10.23.175.25410.23.175.255
2510.23.176.0/2310.23.176.1 – 10.23.177.25410.23.177.255
2610.23.178.0/2310.23.178.1 – 10.23.179.25410.23.179.255
2710.23.180.0/2310.23.180.1 – 10.23.181.25410.23.181.255
2810.23.182.0/2310.23.182.1 – 10.23.183.25410.23.183.255
2910.23.184.0/2310.23.184.1 – 10.23.185.25410.23.185.255
3010.23.186.0/2310.23.186.1 – 10.23.187.25410.23.187.255
3110.23.188.0/2310.23.188.1 – 10.23.189.25410.23.189.255
3210.23.190.0/2310.23.190.1 – 10.23.191.25410.23.191.255
3310.23.192.0/2310.23.192.1 – 10.23.193.25410.23.193.255
3410.23.194.0/2310.23.194.1 – 10.23.195.25410.23.195.255
3510.23.196.0/2310.23.196.1 – 10.23.197.25410.23.197.255
3610.23.198.0/2310.23.198.1 – 10.23.199.25410.23.199.255
3710.23.200.0/2310.23.200.1 – 10.23.201.25410.23.201.255
3810.23.202.0/2310.23.202.1 – 10.23.203.25410.23.203.255
3910.23.204.0/2310.23.204.1 – 10.23.205.25410.23.205.255
4010.23.206.0/2310.23.206.1 – 10.23.207.25410.23.207.255
4110.23.208.0/2310.23.208.1 – 10.23.209.25410.23.209.255
4210.23.210.0/2310.23.210.1 – 10.23.211.25410.23.211.255
4310.23.212.0/2310.23.212.1 – 10.23.213.25410.23.213.255
4410.23.214.0/2310.23.214.1 – 10.23.215.25410.23.215.255
4510.23.216.0/2310.23.216.1 – 10.23.217.25410.23.217.255
4610.23.218.0/2310.23.218.1 – 10.23.219.25410.23.219.255
4710.23.220.0/2310.23.220.1 – 10.23.221.25410.23.221.255
4810.23.222.0/2310.23.222.1 – 10.23.223.25410.23.223.255
4910.23.224.0/2310.23.224.1 – 10.23.225.25410.23.225.255
5010.23.226.0/2310.23.226.1 – 10.23.227.25410.23.227.255
5110.23.228.0/2310.23.228.1 – 10.23.229.25410.23.229.255
5210.23.230.0/2310.23.230.1 – 10.23.231.25410.23.231.255
5310.23.232.0/2310.23.232.1 – 10.23.233.25410.23.233.255
5410.23.234.0/2310.23.234.1 – 10.23.235.25410.23.235.255
5510.23.236.0/2310.23.236.1 – 10.23.237.25410.23.237.255
5610.23.238.0/2310.23.238.1 – 10.23.239.25410.23.239.255
5710.23.240.0/2310.23.240.1 – 10.23.241.25410.23.241.255
5810.23.242.0/2310.23.242.1 – 10.23.243.25410.23.243.255
5910.23.244.0/2310.23.244.1 – 10.23.245.25410.23.245.255
6010.23.246.0/2310.23.246.1 – 10.23.247.25410.23.247.255
6110.23.248.0/2310.23.248.1 – 10.23.249.25410.23.249.255
6210.23.250.0/2310.23.250.1 – 10.23.251.25410.23.251.255
6310.23.252.0/2310.23.252.1 – 10.23.253.25410.23.253.255
6410.23.254.0/2310.23.254.1 – 10.23.255.25410.23.255.255
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 →