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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)10.55.128.0/17
network10.55.128.0/17
broadcast10.55.255.255
first host10.55.128.1
last host10.55.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.55.128.0/17
address00001010.00110111.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00110111.10000000.00000000
broadcast00001010.00110111.11111111.11111111
green = network part, grey = host part
hex0x0a378000
decimal171409408
reverse dns0.128.55.10.in-addr.arpa
ipv4-mapped::ffff:a37:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.55.128.0/2310.55.128.1 – 10.55.129.25410.55.129.255
210.55.130.0/2310.55.130.1 – 10.55.131.25410.55.131.255
310.55.132.0/2310.55.132.1 – 10.55.133.25410.55.133.255
410.55.134.0/2310.55.134.1 – 10.55.135.25410.55.135.255
510.55.136.0/2310.55.136.1 – 10.55.137.25410.55.137.255
610.55.138.0/2310.55.138.1 – 10.55.139.25410.55.139.255
710.55.140.0/2310.55.140.1 – 10.55.141.25410.55.141.255
810.55.142.0/2310.55.142.1 – 10.55.143.25410.55.143.255
910.55.144.0/2310.55.144.1 – 10.55.145.25410.55.145.255
1010.55.146.0/2310.55.146.1 – 10.55.147.25410.55.147.255
1110.55.148.0/2310.55.148.1 – 10.55.149.25410.55.149.255
1210.55.150.0/2310.55.150.1 – 10.55.151.25410.55.151.255
1310.55.152.0/2310.55.152.1 – 10.55.153.25410.55.153.255
1410.55.154.0/2310.55.154.1 – 10.55.155.25410.55.155.255
1510.55.156.0/2310.55.156.1 – 10.55.157.25410.55.157.255
1610.55.158.0/2310.55.158.1 – 10.55.159.25410.55.159.255
1710.55.160.0/2310.55.160.1 – 10.55.161.25410.55.161.255
1810.55.162.0/2310.55.162.1 – 10.55.163.25410.55.163.255
1910.55.164.0/2310.55.164.1 – 10.55.165.25410.55.165.255
2010.55.166.0/2310.55.166.1 – 10.55.167.25410.55.167.255
2110.55.168.0/2310.55.168.1 – 10.55.169.25410.55.169.255
2210.55.170.0/2310.55.170.1 – 10.55.171.25410.55.171.255
2310.55.172.0/2310.55.172.1 – 10.55.173.25410.55.173.255
2410.55.174.0/2310.55.174.1 – 10.55.175.25410.55.175.255
2510.55.176.0/2310.55.176.1 – 10.55.177.25410.55.177.255
2610.55.178.0/2310.55.178.1 – 10.55.179.25410.55.179.255
2710.55.180.0/2310.55.180.1 – 10.55.181.25410.55.181.255
2810.55.182.0/2310.55.182.1 – 10.55.183.25410.55.183.255
2910.55.184.0/2310.55.184.1 – 10.55.185.25410.55.185.255
3010.55.186.0/2310.55.186.1 – 10.55.187.25410.55.187.255
3110.55.188.0/2310.55.188.1 – 10.55.189.25410.55.189.255
3210.55.190.0/2310.55.190.1 – 10.55.191.25410.55.191.255
3310.55.192.0/2310.55.192.1 – 10.55.193.25410.55.193.255
3410.55.194.0/2310.55.194.1 – 10.55.195.25410.55.195.255
3510.55.196.0/2310.55.196.1 – 10.55.197.25410.55.197.255
3610.55.198.0/2310.55.198.1 – 10.55.199.25410.55.199.255
3710.55.200.0/2310.55.200.1 – 10.55.201.25410.55.201.255
3810.55.202.0/2310.55.202.1 – 10.55.203.25410.55.203.255
3910.55.204.0/2310.55.204.1 – 10.55.205.25410.55.205.255
4010.55.206.0/2310.55.206.1 – 10.55.207.25410.55.207.255
4110.55.208.0/2310.55.208.1 – 10.55.209.25410.55.209.255
4210.55.210.0/2310.55.210.1 – 10.55.211.25410.55.211.255
4310.55.212.0/2310.55.212.1 – 10.55.213.25410.55.213.255
4410.55.214.0/2310.55.214.1 – 10.55.215.25410.55.215.255
4510.55.216.0/2310.55.216.1 – 10.55.217.25410.55.217.255
4610.55.218.0/2310.55.218.1 – 10.55.219.25410.55.219.255
4710.55.220.0/2310.55.220.1 – 10.55.221.25410.55.221.255
4810.55.222.0/2310.55.222.1 – 10.55.223.25410.55.223.255
4910.55.224.0/2310.55.224.1 – 10.55.225.25410.55.225.255
5010.55.226.0/2310.55.226.1 – 10.55.227.25410.55.227.255
5110.55.228.0/2310.55.228.1 – 10.55.229.25410.55.229.255
5210.55.230.0/2310.55.230.1 – 10.55.231.25410.55.231.255
5310.55.232.0/2310.55.232.1 – 10.55.233.25410.55.233.255
5410.55.234.0/2310.55.234.1 – 10.55.235.25410.55.235.255
5510.55.236.0/2310.55.236.1 – 10.55.237.25410.55.237.255
5610.55.238.0/2310.55.238.1 – 10.55.239.25410.55.239.255
5710.55.240.0/2310.55.240.1 – 10.55.241.25410.55.241.255
5810.55.242.0/2310.55.242.1 – 10.55.243.25410.55.243.255
5910.55.244.0/2310.55.244.1 – 10.55.245.25410.55.245.255
6010.55.246.0/2310.55.246.1 – 10.55.247.25410.55.247.255
6110.55.248.0/2310.55.248.1 – 10.55.249.25410.55.249.255
6210.55.250.0/2310.55.250.1 – 10.55.251.25410.55.251.255
6310.55.252.0/2310.55.252.1 – 10.55.253.25410.55.253.255
6410.55.254.0/2310.55.254.1 – 10.55.255.25410.55.255.255
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 →