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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)10.3.111.0/25
network10.3.111.0/25
broadcast10.3.111.127
first host10.3.111.1
last host10.3.111.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.111.0/25
address00001010.00000011.01101111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.01101111.00000000
broadcast00001010.00000011.01101111.01111111
green = network part, grey = host part
hex0x0a036f00
decimal167997184
reverse dns0.111.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:6f00

/25 split into /29 · 16 subnets

close ×
#networkhost rangebroadcast
110.3.111.0/2910.3.111.1 – 10.3.111.610.3.111.7
210.3.111.8/2910.3.111.9 – 10.3.111.1410.3.111.15
310.3.111.16/2910.3.111.17 – 10.3.111.2210.3.111.23
410.3.111.24/2910.3.111.25 – 10.3.111.3010.3.111.31
510.3.111.32/2910.3.111.33 – 10.3.111.3810.3.111.39
610.3.111.40/2910.3.111.41 – 10.3.111.4610.3.111.47
710.3.111.48/2910.3.111.49 – 10.3.111.5410.3.111.55
810.3.111.56/2910.3.111.57 – 10.3.111.6210.3.111.63
910.3.111.64/2910.3.111.65 – 10.3.111.7010.3.111.71
1010.3.111.72/2910.3.111.73 – 10.3.111.7810.3.111.79
1110.3.111.80/2910.3.111.81 – 10.3.111.8610.3.111.87
1210.3.111.88/2910.3.111.89 – 10.3.111.9410.3.111.95
1310.3.111.96/2910.3.111.97 – 10.3.111.10210.3.111.103
1410.3.111.104/2910.3.111.105 – 10.3.111.11010.3.111.111
1510.3.111.112/2910.3.111.113 – 10.3.111.11810.3.111.119
1610.3.111.120/2910.3.111.121 – 10.3.111.12610.3.111.127
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /25
/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-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →