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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)10.45.128.0/17
network10.45.128.0/17
broadcast10.45.255.255
first host10.45.128.1
last host10.45.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.45.128.0/17
address00001010.00101101.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00101101.10000000.00000000
broadcast00001010.00101101.11111111.11111111
green = network part, grey = host part
hex0x0a2d8000
decimal170754048
reverse dns0.128.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.45.128.0/2310.45.128.1 – 10.45.129.25410.45.129.255
210.45.130.0/2310.45.130.1 – 10.45.131.25410.45.131.255
310.45.132.0/2310.45.132.1 – 10.45.133.25410.45.133.255
410.45.134.0/2310.45.134.1 – 10.45.135.25410.45.135.255
510.45.136.0/2310.45.136.1 – 10.45.137.25410.45.137.255
610.45.138.0/2310.45.138.1 – 10.45.139.25410.45.139.255
710.45.140.0/2310.45.140.1 – 10.45.141.25410.45.141.255
810.45.142.0/2310.45.142.1 – 10.45.143.25410.45.143.255
910.45.144.0/2310.45.144.1 – 10.45.145.25410.45.145.255
1010.45.146.0/2310.45.146.1 – 10.45.147.25410.45.147.255
1110.45.148.0/2310.45.148.1 – 10.45.149.25410.45.149.255
1210.45.150.0/2310.45.150.1 – 10.45.151.25410.45.151.255
1310.45.152.0/2310.45.152.1 – 10.45.153.25410.45.153.255
1410.45.154.0/2310.45.154.1 – 10.45.155.25410.45.155.255
1510.45.156.0/2310.45.156.1 – 10.45.157.25410.45.157.255
1610.45.158.0/2310.45.158.1 – 10.45.159.25410.45.159.255
1710.45.160.0/2310.45.160.1 – 10.45.161.25410.45.161.255
1810.45.162.0/2310.45.162.1 – 10.45.163.25410.45.163.255
1910.45.164.0/2310.45.164.1 – 10.45.165.25410.45.165.255
2010.45.166.0/2310.45.166.1 – 10.45.167.25410.45.167.255
2110.45.168.0/2310.45.168.1 – 10.45.169.25410.45.169.255
2210.45.170.0/2310.45.170.1 – 10.45.171.25410.45.171.255
2310.45.172.0/2310.45.172.1 – 10.45.173.25410.45.173.255
2410.45.174.0/2310.45.174.1 – 10.45.175.25410.45.175.255
2510.45.176.0/2310.45.176.1 – 10.45.177.25410.45.177.255
2610.45.178.0/2310.45.178.1 – 10.45.179.25410.45.179.255
2710.45.180.0/2310.45.180.1 – 10.45.181.25410.45.181.255
2810.45.182.0/2310.45.182.1 – 10.45.183.25410.45.183.255
2910.45.184.0/2310.45.184.1 – 10.45.185.25410.45.185.255
3010.45.186.0/2310.45.186.1 – 10.45.187.25410.45.187.255
3110.45.188.0/2310.45.188.1 – 10.45.189.25410.45.189.255
3210.45.190.0/2310.45.190.1 – 10.45.191.25410.45.191.255
3310.45.192.0/2310.45.192.1 – 10.45.193.25410.45.193.255
3410.45.194.0/2310.45.194.1 – 10.45.195.25410.45.195.255
3510.45.196.0/2310.45.196.1 – 10.45.197.25410.45.197.255
3610.45.198.0/2310.45.198.1 – 10.45.199.25410.45.199.255
3710.45.200.0/2310.45.200.1 – 10.45.201.25410.45.201.255
3810.45.202.0/2310.45.202.1 – 10.45.203.25410.45.203.255
3910.45.204.0/2310.45.204.1 – 10.45.205.25410.45.205.255
4010.45.206.0/2310.45.206.1 – 10.45.207.25410.45.207.255
4110.45.208.0/2310.45.208.1 – 10.45.209.25410.45.209.255
4210.45.210.0/2310.45.210.1 – 10.45.211.25410.45.211.255
4310.45.212.0/2310.45.212.1 – 10.45.213.25410.45.213.255
4410.45.214.0/2310.45.214.1 – 10.45.215.25410.45.215.255
4510.45.216.0/2310.45.216.1 – 10.45.217.25410.45.217.255
4610.45.218.0/2310.45.218.1 – 10.45.219.25410.45.219.255
4710.45.220.0/2310.45.220.1 – 10.45.221.25410.45.221.255
4810.45.222.0/2310.45.222.1 – 10.45.223.25410.45.223.255
4910.45.224.0/2310.45.224.1 – 10.45.225.25410.45.225.255
5010.45.226.0/2310.45.226.1 – 10.45.227.25410.45.227.255
5110.45.228.0/2310.45.228.1 – 10.45.229.25410.45.229.255
5210.45.230.0/2310.45.230.1 – 10.45.231.25410.45.231.255
5310.45.232.0/2310.45.232.1 – 10.45.233.25410.45.233.255
5410.45.234.0/2310.45.234.1 – 10.45.235.25410.45.235.255
5510.45.236.0/2310.45.236.1 – 10.45.237.25410.45.237.255
5610.45.238.0/2310.45.238.1 – 10.45.239.25410.45.239.255
5710.45.240.0/2310.45.240.1 – 10.45.241.25410.45.241.255
5810.45.242.0/2310.45.242.1 – 10.45.243.25410.45.243.255
5910.45.244.0/2310.45.244.1 – 10.45.245.25410.45.245.255
6010.45.246.0/2310.45.246.1 – 10.45.247.25410.45.247.255
6110.45.248.0/2310.45.248.1 – 10.45.249.25410.45.249.255
6210.45.250.0/2310.45.250.1 – 10.45.251.25410.45.251.255
6310.45.252.0/2310.45.252.1 – 10.45.253.25410.45.253.255
6410.45.254.0/2310.45.254.1 – 10.45.255.25410.45.255.255
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 →