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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)10.70.128.0/17
network10.70.128.0/17
broadcast10.70.255.255
first host10.70.128.1
last host10.70.255.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.70.128.0/17
address00001010.01000110.10000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01000110.10000000.00000000
broadcast00001010.01000110.11111111.11111111
green = network part, grey = host part
hex0x0a468000
decimal172392448
reverse dns0.128.70.10.in-addr.arpa
ipv4-mapped::ffff:a46:8000

/17 split into /22 · 32 subnets

close ×
#networkhost rangebroadcast
110.70.128.0/2210.70.128.1 – 10.70.131.25410.70.131.255
210.70.132.0/2210.70.132.1 – 10.70.135.25410.70.135.255
310.70.136.0/2210.70.136.1 – 10.70.139.25410.70.139.255
410.70.140.0/2210.70.140.1 – 10.70.143.25410.70.143.255
510.70.144.0/2210.70.144.1 – 10.70.147.25410.70.147.255
610.70.148.0/2210.70.148.1 – 10.70.151.25410.70.151.255
710.70.152.0/2210.70.152.1 – 10.70.155.25410.70.155.255
810.70.156.0/2210.70.156.1 – 10.70.159.25410.70.159.255
910.70.160.0/2210.70.160.1 – 10.70.163.25410.70.163.255
1010.70.164.0/2210.70.164.1 – 10.70.167.25410.70.167.255
1110.70.168.0/2210.70.168.1 – 10.70.171.25410.70.171.255
1210.70.172.0/2210.70.172.1 – 10.70.175.25410.70.175.255
1310.70.176.0/2210.70.176.1 – 10.70.179.25410.70.179.255
1410.70.180.0/2210.70.180.1 – 10.70.183.25410.70.183.255
1510.70.184.0/2210.70.184.1 – 10.70.187.25410.70.187.255
1610.70.188.0/2210.70.188.1 – 10.70.191.25410.70.191.255
1710.70.192.0/2210.70.192.1 – 10.70.195.25410.70.195.255
1810.70.196.0/2210.70.196.1 – 10.70.199.25410.70.199.255
1910.70.200.0/2210.70.200.1 – 10.70.203.25410.70.203.255
2010.70.204.0/2210.70.204.1 – 10.70.207.25410.70.207.255
2110.70.208.0/2210.70.208.1 – 10.70.211.25410.70.211.255
2210.70.212.0/2210.70.212.1 – 10.70.215.25410.70.215.255
2310.70.216.0/2210.70.216.1 – 10.70.219.25410.70.219.255
2410.70.220.0/2210.70.220.1 – 10.70.223.25410.70.223.255
2510.70.224.0/2210.70.224.1 – 10.70.227.25410.70.227.255
2610.70.228.0/2210.70.228.1 – 10.70.231.25410.70.231.255
2710.70.232.0/2210.70.232.1 – 10.70.235.25410.70.235.255
2810.70.236.0/2210.70.236.1 – 10.70.239.25410.70.239.255
2910.70.240.0/2210.70.240.1 – 10.70.243.25410.70.243.255
3010.70.244.0/2210.70.244.1 – 10.70.247.25410.70.247.255
3110.70.248.0/2210.70.248.1 – 10.70.251.25410.70.251.255
3210.70.252.0/2210.70.252.1 – 10.70.255.25410.70.255.255
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 →