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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)10.102.128.0/17
network10.102.128.0/17
broadcast10.102.255.255
first host10.102.128.1
last host10.102.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.102.128.0/17
address00001010.01100110.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01100110.10000000.00000000
broadcast00001010.01100110.11111111.11111111
green = network part, grey = host part
hex0x0a668000
decimal174489600
reverse dns0.128.102.10.in-addr.arpa
ipv4-mapped::ffff:a66:8000

/17 split into /22 · 32 subnets

close ×
#networkhost rangebroadcast
110.102.128.0/2210.102.128.1 – 10.102.131.25410.102.131.255
210.102.132.0/2210.102.132.1 – 10.102.135.25410.102.135.255
310.102.136.0/2210.102.136.1 – 10.102.139.25410.102.139.255
410.102.140.0/2210.102.140.1 – 10.102.143.25410.102.143.255
510.102.144.0/2210.102.144.1 – 10.102.147.25410.102.147.255
610.102.148.0/2210.102.148.1 – 10.102.151.25410.102.151.255
710.102.152.0/2210.102.152.1 – 10.102.155.25410.102.155.255
810.102.156.0/2210.102.156.1 – 10.102.159.25410.102.159.255
910.102.160.0/2210.102.160.1 – 10.102.163.25410.102.163.255
1010.102.164.0/2210.102.164.1 – 10.102.167.25410.102.167.255
1110.102.168.0/2210.102.168.1 – 10.102.171.25410.102.171.255
1210.102.172.0/2210.102.172.1 – 10.102.175.25410.102.175.255
1310.102.176.0/2210.102.176.1 – 10.102.179.25410.102.179.255
1410.102.180.0/2210.102.180.1 – 10.102.183.25410.102.183.255
1510.102.184.0/2210.102.184.1 – 10.102.187.25410.102.187.255
1610.102.188.0/2210.102.188.1 – 10.102.191.25410.102.191.255
1710.102.192.0/2210.102.192.1 – 10.102.195.25410.102.195.255
1810.102.196.0/2210.102.196.1 – 10.102.199.25410.102.199.255
1910.102.200.0/2210.102.200.1 – 10.102.203.25410.102.203.255
2010.102.204.0/2210.102.204.1 – 10.102.207.25410.102.207.255
2110.102.208.0/2210.102.208.1 – 10.102.211.25410.102.211.255
2210.102.212.0/2210.102.212.1 – 10.102.215.25410.102.215.255
2310.102.216.0/2210.102.216.1 – 10.102.219.25410.102.219.255
2410.102.220.0/2210.102.220.1 – 10.102.223.25410.102.223.255
2510.102.224.0/2210.102.224.1 – 10.102.227.25410.102.227.255
2610.102.228.0/2210.102.228.1 – 10.102.231.25410.102.231.255
2710.102.232.0/2210.102.232.1 – 10.102.235.25410.102.235.255
2810.102.236.0/2210.102.236.1 – 10.102.239.25410.102.239.255
2910.102.240.0/2210.102.240.1 – 10.102.243.25410.102.243.255
3010.102.244.0/2210.102.244.1 – 10.102.247.25410.102.247.255
3110.102.248.0/2210.102.248.1 – 10.102.251.25410.102.251.255
3210.102.252.0/2210.102.252.1 – 10.102.255.25410.102.255.255
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 →