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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)10.86.128.0/17
network10.86.128.0/17
broadcast10.86.255.255
first host10.86.128.1
last host10.86.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.86.128.0/17
address00001010.01010110.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01010110.10000000.00000000
broadcast00001010.01010110.11111111.11111111
green = network part, grey = host part
hex0x0a568000
decimal173441024
reverse dns0.128.86.10.in-addr.arpa
ipv4-mapped::ffff:a56:8000

/17 split into /22 · 32 subnets

close ×
#networkhost rangebroadcast
110.86.128.0/2210.86.128.1 – 10.86.131.25410.86.131.255
210.86.132.0/2210.86.132.1 – 10.86.135.25410.86.135.255
310.86.136.0/2210.86.136.1 – 10.86.139.25410.86.139.255
410.86.140.0/2210.86.140.1 – 10.86.143.25410.86.143.255
510.86.144.0/2210.86.144.1 – 10.86.147.25410.86.147.255
610.86.148.0/2210.86.148.1 – 10.86.151.25410.86.151.255
710.86.152.0/2210.86.152.1 – 10.86.155.25410.86.155.255
810.86.156.0/2210.86.156.1 – 10.86.159.25410.86.159.255
910.86.160.0/2210.86.160.1 – 10.86.163.25410.86.163.255
1010.86.164.0/2210.86.164.1 – 10.86.167.25410.86.167.255
1110.86.168.0/2210.86.168.1 – 10.86.171.25410.86.171.255
1210.86.172.0/2210.86.172.1 – 10.86.175.25410.86.175.255
1310.86.176.0/2210.86.176.1 – 10.86.179.25410.86.179.255
1410.86.180.0/2210.86.180.1 – 10.86.183.25410.86.183.255
1510.86.184.0/2210.86.184.1 – 10.86.187.25410.86.187.255
1610.86.188.0/2210.86.188.1 – 10.86.191.25410.86.191.255
1710.86.192.0/2210.86.192.1 – 10.86.195.25410.86.195.255
1810.86.196.0/2210.86.196.1 – 10.86.199.25410.86.199.255
1910.86.200.0/2210.86.200.1 – 10.86.203.25410.86.203.255
2010.86.204.0/2210.86.204.1 – 10.86.207.25410.86.207.255
2110.86.208.0/2210.86.208.1 – 10.86.211.25410.86.211.255
2210.86.212.0/2210.86.212.1 – 10.86.215.25410.86.215.255
2310.86.216.0/2210.86.216.1 – 10.86.219.25410.86.219.255
2410.86.220.0/2210.86.220.1 – 10.86.223.25410.86.223.255
2510.86.224.0/2210.86.224.1 – 10.86.227.25410.86.227.255
2610.86.228.0/2210.86.228.1 – 10.86.231.25410.86.231.255
2710.86.232.0/2210.86.232.1 – 10.86.235.25410.86.235.255
2810.86.236.0/2210.86.236.1 – 10.86.239.25410.86.239.255
2910.86.240.0/2210.86.240.1 – 10.86.243.25410.86.243.255
3010.86.244.0/2210.86.244.1 – 10.86.247.25410.86.247.255
3110.86.248.0/2210.86.248.1 – 10.86.251.25410.86.251.255
3210.86.252.0/2210.86.252.1 – 10.86.255.25410.86.255.255
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 →