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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)10.19.128.0/17
network10.19.128.0/17
broadcast10.19.255.255
first host10.19.128.1
last host10.19.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.19.128.0/17
address00001010.00010011.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00010011.10000000.00000000
broadcast00001010.00010011.11111111.11111111
green = network part, grey = host part
hex0x0a138000
decimal169050112
reverse dns0.128.19.10.in-addr.arpa
ipv4-mapped::ffff:a13:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.19.128.0/2310.19.128.1 – 10.19.129.25410.19.129.255
210.19.130.0/2310.19.130.1 – 10.19.131.25410.19.131.255
310.19.132.0/2310.19.132.1 – 10.19.133.25410.19.133.255
410.19.134.0/2310.19.134.1 – 10.19.135.25410.19.135.255
510.19.136.0/2310.19.136.1 – 10.19.137.25410.19.137.255
610.19.138.0/2310.19.138.1 – 10.19.139.25410.19.139.255
710.19.140.0/2310.19.140.1 – 10.19.141.25410.19.141.255
810.19.142.0/2310.19.142.1 – 10.19.143.25410.19.143.255
910.19.144.0/2310.19.144.1 – 10.19.145.25410.19.145.255
1010.19.146.0/2310.19.146.1 – 10.19.147.25410.19.147.255
1110.19.148.0/2310.19.148.1 – 10.19.149.25410.19.149.255
1210.19.150.0/2310.19.150.1 – 10.19.151.25410.19.151.255
1310.19.152.0/2310.19.152.1 – 10.19.153.25410.19.153.255
1410.19.154.0/2310.19.154.1 – 10.19.155.25410.19.155.255
1510.19.156.0/2310.19.156.1 – 10.19.157.25410.19.157.255
1610.19.158.0/2310.19.158.1 – 10.19.159.25410.19.159.255
1710.19.160.0/2310.19.160.1 – 10.19.161.25410.19.161.255
1810.19.162.0/2310.19.162.1 – 10.19.163.25410.19.163.255
1910.19.164.0/2310.19.164.1 – 10.19.165.25410.19.165.255
2010.19.166.0/2310.19.166.1 – 10.19.167.25410.19.167.255
2110.19.168.0/2310.19.168.1 – 10.19.169.25410.19.169.255
2210.19.170.0/2310.19.170.1 – 10.19.171.25410.19.171.255
2310.19.172.0/2310.19.172.1 – 10.19.173.25410.19.173.255
2410.19.174.0/2310.19.174.1 – 10.19.175.25410.19.175.255
2510.19.176.0/2310.19.176.1 – 10.19.177.25410.19.177.255
2610.19.178.0/2310.19.178.1 – 10.19.179.25410.19.179.255
2710.19.180.0/2310.19.180.1 – 10.19.181.25410.19.181.255
2810.19.182.0/2310.19.182.1 – 10.19.183.25410.19.183.255
2910.19.184.0/2310.19.184.1 – 10.19.185.25410.19.185.255
3010.19.186.0/2310.19.186.1 – 10.19.187.25410.19.187.255
3110.19.188.0/2310.19.188.1 – 10.19.189.25410.19.189.255
3210.19.190.0/2310.19.190.1 – 10.19.191.25410.19.191.255
3310.19.192.0/2310.19.192.1 – 10.19.193.25410.19.193.255
3410.19.194.0/2310.19.194.1 – 10.19.195.25410.19.195.255
3510.19.196.0/2310.19.196.1 – 10.19.197.25410.19.197.255
3610.19.198.0/2310.19.198.1 – 10.19.199.25410.19.199.255
3710.19.200.0/2310.19.200.1 – 10.19.201.25410.19.201.255
3810.19.202.0/2310.19.202.1 – 10.19.203.25410.19.203.255
3910.19.204.0/2310.19.204.1 – 10.19.205.25410.19.205.255
4010.19.206.0/2310.19.206.1 – 10.19.207.25410.19.207.255
4110.19.208.0/2310.19.208.1 – 10.19.209.25410.19.209.255
4210.19.210.0/2310.19.210.1 – 10.19.211.25410.19.211.255
4310.19.212.0/2310.19.212.1 – 10.19.213.25410.19.213.255
4410.19.214.0/2310.19.214.1 – 10.19.215.25410.19.215.255
4510.19.216.0/2310.19.216.1 – 10.19.217.25410.19.217.255
4610.19.218.0/2310.19.218.1 – 10.19.219.25410.19.219.255
4710.19.220.0/2310.19.220.1 – 10.19.221.25410.19.221.255
4810.19.222.0/2310.19.222.1 – 10.19.223.25410.19.223.255
4910.19.224.0/2310.19.224.1 – 10.19.225.25410.19.225.255
5010.19.226.0/2310.19.226.1 – 10.19.227.25410.19.227.255
5110.19.228.0/2310.19.228.1 – 10.19.229.25410.19.229.255
5210.19.230.0/2310.19.230.1 – 10.19.231.25410.19.231.255
5310.19.232.0/2310.19.232.1 – 10.19.233.25410.19.233.255
5410.19.234.0/2310.19.234.1 – 10.19.235.25410.19.235.255
5510.19.236.0/2310.19.236.1 – 10.19.237.25410.19.237.255
5610.19.238.0/2310.19.238.1 – 10.19.239.25410.19.239.255
5710.19.240.0/2310.19.240.1 – 10.19.241.25410.19.241.255
5810.19.242.0/2310.19.242.1 – 10.19.243.25410.19.243.255
5910.19.244.0/2310.19.244.1 – 10.19.245.25410.19.245.255
6010.19.246.0/2310.19.246.1 – 10.19.247.25410.19.247.255
6110.19.248.0/2310.19.248.1 – 10.19.249.25410.19.249.255
6210.19.250.0/2310.19.250.1 – 10.19.251.25410.19.251.255
6310.19.252.0/2310.19.252.1 – 10.19.253.25410.19.253.255
6410.19.254.0/2310.19.254.1 – 10.19.255.25410.19.255.255
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 →