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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)10.47.128.0/17
network10.47.128.0/17
broadcast10.47.255.255
first host10.47.128.1
last host10.47.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.47.128.0/17
address00001010.00101111.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00101111.10000000.00000000
broadcast00001010.00101111.11111111.11111111
green = network part, grey = host part
hex0x0a2f8000
decimal170885120
reverse dns0.128.47.10.in-addr.arpa
ipv4-mapped::ffff:a2f:8000

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.47.128.0/2310.47.128.1 – 10.47.129.25410.47.129.255
210.47.130.0/2310.47.130.1 – 10.47.131.25410.47.131.255
310.47.132.0/2310.47.132.1 – 10.47.133.25410.47.133.255
410.47.134.0/2310.47.134.1 – 10.47.135.25410.47.135.255
510.47.136.0/2310.47.136.1 – 10.47.137.25410.47.137.255
610.47.138.0/2310.47.138.1 – 10.47.139.25410.47.139.255
710.47.140.0/2310.47.140.1 – 10.47.141.25410.47.141.255
810.47.142.0/2310.47.142.1 – 10.47.143.25410.47.143.255
910.47.144.0/2310.47.144.1 – 10.47.145.25410.47.145.255
1010.47.146.0/2310.47.146.1 – 10.47.147.25410.47.147.255
1110.47.148.0/2310.47.148.1 – 10.47.149.25410.47.149.255
1210.47.150.0/2310.47.150.1 – 10.47.151.25410.47.151.255
1310.47.152.0/2310.47.152.1 – 10.47.153.25410.47.153.255
1410.47.154.0/2310.47.154.1 – 10.47.155.25410.47.155.255
1510.47.156.0/2310.47.156.1 – 10.47.157.25410.47.157.255
1610.47.158.0/2310.47.158.1 – 10.47.159.25410.47.159.255
1710.47.160.0/2310.47.160.1 – 10.47.161.25410.47.161.255
1810.47.162.0/2310.47.162.1 – 10.47.163.25410.47.163.255
1910.47.164.0/2310.47.164.1 – 10.47.165.25410.47.165.255
2010.47.166.0/2310.47.166.1 – 10.47.167.25410.47.167.255
2110.47.168.0/2310.47.168.1 – 10.47.169.25410.47.169.255
2210.47.170.0/2310.47.170.1 – 10.47.171.25410.47.171.255
2310.47.172.0/2310.47.172.1 – 10.47.173.25410.47.173.255
2410.47.174.0/2310.47.174.1 – 10.47.175.25410.47.175.255
2510.47.176.0/2310.47.176.1 – 10.47.177.25410.47.177.255
2610.47.178.0/2310.47.178.1 – 10.47.179.25410.47.179.255
2710.47.180.0/2310.47.180.1 – 10.47.181.25410.47.181.255
2810.47.182.0/2310.47.182.1 – 10.47.183.25410.47.183.255
2910.47.184.0/2310.47.184.1 – 10.47.185.25410.47.185.255
3010.47.186.0/2310.47.186.1 – 10.47.187.25410.47.187.255
3110.47.188.0/2310.47.188.1 – 10.47.189.25410.47.189.255
3210.47.190.0/2310.47.190.1 – 10.47.191.25410.47.191.255
3310.47.192.0/2310.47.192.1 – 10.47.193.25410.47.193.255
3410.47.194.0/2310.47.194.1 – 10.47.195.25410.47.195.255
3510.47.196.0/2310.47.196.1 – 10.47.197.25410.47.197.255
3610.47.198.0/2310.47.198.1 – 10.47.199.25410.47.199.255
3710.47.200.0/2310.47.200.1 – 10.47.201.25410.47.201.255
3810.47.202.0/2310.47.202.1 – 10.47.203.25410.47.203.255
3910.47.204.0/2310.47.204.1 – 10.47.205.25410.47.205.255
4010.47.206.0/2310.47.206.1 – 10.47.207.25410.47.207.255
4110.47.208.0/2310.47.208.1 – 10.47.209.25410.47.209.255
4210.47.210.0/2310.47.210.1 – 10.47.211.25410.47.211.255
4310.47.212.0/2310.47.212.1 – 10.47.213.25410.47.213.255
4410.47.214.0/2310.47.214.1 – 10.47.215.25410.47.215.255
4510.47.216.0/2310.47.216.1 – 10.47.217.25410.47.217.255
4610.47.218.0/2310.47.218.1 – 10.47.219.25410.47.219.255
4710.47.220.0/2310.47.220.1 – 10.47.221.25410.47.221.255
4810.47.222.0/2310.47.222.1 – 10.47.223.25410.47.223.255
4910.47.224.0/2310.47.224.1 – 10.47.225.25410.47.225.255
5010.47.226.0/2310.47.226.1 – 10.47.227.25410.47.227.255
5110.47.228.0/2310.47.228.1 – 10.47.229.25410.47.229.255
5210.47.230.0/2310.47.230.1 – 10.47.231.25410.47.231.255
5310.47.232.0/2310.47.232.1 – 10.47.233.25410.47.233.255
5410.47.234.0/2310.47.234.1 – 10.47.235.25410.47.235.255
5510.47.236.0/2310.47.236.1 – 10.47.237.25410.47.237.255
5610.47.238.0/2310.47.238.1 – 10.47.239.25410.47.239.255
5710.47.240.0/2310.47.240.1 – 10.47.241.25410.47.241.255
5810.47.242.0/2310.47.242.1 – 10.47.243.25410.47.243.255
5910.47.244.0/2310.47.244.1 – 10.47.245.25410.47.245.255
6010.47.246.0/2310.47.246.1 – 10.47.247.25410.47.247.255
6110.47.248.0/2310.47.248.1 – 10.47.249.25410.47.249.255
6210.47.250.0/2310.47.250.1 – 10.47.251.25410.47.251.255
6310.47.252.0/2310.47.252.1 – 10.47.253.25410.47.253.255
6410.47.254.0/2310.47.254.1 – 10.47.255.25410.47.255.255
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 →