ip
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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)10.231.65.0/25
network10.231.65.0/25
broadcast10.231.65.127
first host10.231.65.1
last host10.231.65.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.231.65.0/25
address00001010.11100111.01000001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.11100111.01000001.00000000
broadcast00001010.11100111.01000001.01111111
green = network part, grey = host part
hex0x0ae74100
decimal182927616
reverse dns0.65.231.10.in-addr.arpa
ipv4-mapped::ffff:ae7:4100

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.231.65.0/3010.231.65.1 – 10.231.65.210.231.65.3
210.231.65.4/3010.231.65.5 – 10.231.65.610.231.65.7
310.231.65.8/3010.231.65.9 – 10.231.65.1010.231.65.11
410.231.65.12/3010.231.65.13 – 10.231.65.1410.231.65.15
510.231.65.16/3010.231.65.17 – 10.231.65.1810.231.65.19
610.231.65.20/3010.231.65.21 – 10.231.65.2210.231.65.23
710.231.65.24/3010.231.65.25 – 10.231.65.2610.231.65.27
810.231.65.28/3010.231.65.29 – 10.231.65.3010.231.65.31
910.231.65.32/3010.231.65.33 – 10.231.65.3410.231.65.35
1010.231.65.36/3010.231.65.37 – 10.231.65.3810.231.65.39
1110.231.65.40/3010.231.65.41 – 10.231.65.4210.231.65.43
1210.231.65.44/3010.231.65.45 – 10.231.65.4610.231.65.47
1310.231.65.48/3010.231.65.49 – 10.231.65.5010.231.65.51
1410.231.65.52/3010.231.65.53 – 10.231.65.5410.231.65.55
1510.231.65.56/3010.231.65.57 – 10.231.65.5810.231.65.59
1610.231.65.60/3010.231.65.61 – 10.231.65.6210.231.65.63
1710.231.65.64/3010.231.65.65 – 10.231.65.6610.231.65.67
1810.231.65.68/3010.231.65.69 – 10.231.65.7010.231.65.71
1910.231.65.72/3010.231.65.73 – 10.231.65.7410.231.65.75
2010.231.65.76/3010.231.65.77 – 10.231.65.7810.231.65.79
2110.231.65.80/3010.231.65.81 – 10.231.65.8210.231.65.83
2210.231.65.84/3010.231.65.85 – 10.231.65.8610.231.65.87
2310.231.65.88/3010.231.65.89 – 10.231.65.9010.231.65.91
2410.231.65.92/3010.231.65.93 – 10.231.65.9410.231.65.95
2510.231.65.96/3010.231.65.97 – 10.231.65.9810.231.65.99
2610.231.65.100/3010.231.65.101 – 10.231.65.10210.231.65.103
2710.231.65.104/3010.231.65.105 – 10.231.65.10610.231.65.107
2810.231.65.108/3010.231.65.109 – 10.231.65.11010.231.65.111
2910.231.65.112/3010.231.65.113 – 10.231.65.11410.231.65.115
3010.231.65.116/3010.231.65.117 – 10.231.65.11810.231.65.119
3110.231.65.120/3010.231.65.121 – 10.231.65.12210.231.65.123
3210.231.65.124/3010.231.65.125 – 10.231.65.12610.231.65.127
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 →