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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)10.20.232.0/25
network10.20.232.0/25
broadcast10.20.232.127
first host10.20.232.1
last host10.20.232.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.20.232.0/25
address00001010.00010100.11101000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00010100.11101000.00000000
broadcast00001010.00010100.11101000.01111111
green = network part, grey = host part
hex0x0a14e800
decimal169142272
reverse dns0.232.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:e800

/25 split into /30 · 32 subnets

close ×
#networkhost rangebroadcast
110.20.232.0/3010.20.232.1 – 10.20.232.210.20.232.3
210.20.232.4/3010.20.232.5 – 10.20.232.610.20.232.7
310.20.232.8/3010.20.232.9 – 10.20.232.1010.20.232.11
410.20.232.12/3010.20.232.13 – 10.20.232.1410.20.232.15
510.20.232.16/3010.20.232.17 – 10.20.232.1810.20.232.19
610.20.232.20/3010.20.232.21 – 10.20.232.2210.20.232.23
710.20.232.24/3010.20.232.25 – 10.20.232.2610.20.232.27
810.20.232.28/3010.20.232.29 – 10.20.232.3010.20.232.31
910.20.232.32/3010.20.232.33 – 10.20.232.3410.20.232.35
1010.20.232.36/3010.20.232.37 – 10.20.232.3810.20.232.39
1110.20.232.40/3010.20.232.41 – 10.20.232.4210.20.232.43
1210.20.232.44/3010.20.232.45 – 10.20.232.4610.20.232.47
1310.20.232.48/3010.20.232.49 – 10.20.232.5010.20.232.51
1410.20.232.52/3010.20.232.53 – 10.20.232.5410.20.232.55
1510.20.232.56/3010.20.232.57 – 10.20.232.5810.20.232.59
1610.20.232.60/3010.20.232.61 – 10.20.232.6210.20.232.63
1710.20.232.64/3010.20.232.65 – 10.20.232.6610.20.232.67
1810.20.232.68/3010.20.232.69 – 10.20.232.7010.20.232.71
1910.20.232.72/3010.20.232.73 – 10.20.232.7410.20.232.75
2010.20.232.76/3010.20.232.77 – 10.20.232.7810.20.232.79
2110.20.232.80/3010.20.232.81 – 10.20.232.8210.20.232.83
2210.20.232.84/3010.20.232.85 – 10.20.232.8610.20.232.87
2310.20.232.88/3010.20.232.89 – 10.20.232.9010.20.232.91
2410.20.232.92/3010.20.232.93 – 10.20.232.9410.20.232.95
2510.20.232.96/3010.20.232.97 – 10.20.232.9810.20.232.99
2610.20.232.100/3010.20.232.101 – 10.20.232.10210.20.232.103
2710.20.232.104/3010.20.232.105 – 10.20.232.10610.20.232.107
2810.20.232.108/3010.20.232.109 – 10.20.232.11010.20.232.111
2910.20.232.112/3010.20.232.113 – 10.20.232.11410.20.232.115
3010.20.232.116/3010.20.232.117 – 10.20.232.11810.20.232.119
3110.20.232.120/3010.20.232.121 – 10.20.232.12210.20.232.123
3210.20.232.124/3010.20.232.125 – 10.20.232.12610.20.232.127
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 →