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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)10.232.40.0/25
network10.232.40.0/25
broadcast10.232.40.127
first host10.232.40.1
last host10.232.40.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.232.40.0/25
address00001010.11101000.00101000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.11101000.00101000.00000000
broadcast00001010.11101000.00101000.01111111
green = network part, grey = host part
hex0x0ae82800
decimal182986752
reverse dns0.40.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:2800

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.40.0/3110.232.40.0 – 10.232.40.110.232.40.1
210.232.40.2/3110.232.40.2 – 10.232.40.310.232.40.3
310.232.40.4/3110.232.40.4 – 10.232.40.510.232.40.5
410.232.40.6/3110.232.40.6 – 10.232.40.710.232.40.7
510.232.40.8/3110.232.40.8 – 10.232.40.910.232.40.9
610.232.40.10/3110.232.40.10 – 10.232.40.1110.232.40.11
710.232.40.12/3110.232.40.12 – 10.232.40.1310.232.40.13
810.232.40.14/3110.232.40.14 – 10.232.40.1510.232.40.15
910.232.40.16/3110.232.40.16 – 10.232.40.1710.232.40.17
1010.232.40.18/3110.232.40.18 – 10.232.40.1910.232.40.19
1110.232.40.20/3110.232.40.20 – 10.232.40.2110.232.40.21
1210.232.40.22/3110.232.40.22 – 10.232.40.2310.232.40.23
1310.232.40.24/3110.232.40.24 – 10.232.40.2510.232.40.25
1410.232.40.26/3110.232.40.26 – 10.232.40.2710.232.40.27
1510.232.40.28/3110.232.40.28 – 10.232.40.2910.232.40.29
1610.232.40.30/3110.232.40.30 – 10.232.40.3110.232.40.31
1710.232.40.32/3110.232.40.32 – 10.232.40.3310.232.40.33
1810.232.40.34/3110.232.40.34 – 10.232.40.3510.232.40.35
1910.232.40.36/3110.232.40.36 – 10.232.40.3710.232.40.37
2010.232.40.38/3110.232.40.38 – 10.232.40.3910.232.40.39
2110.232.40.40/3110.232.40.40 – 10.232.40.4110.232.40.41
2210.232.40.42/3110.232.40.42 – 10.232.40.4310.232.40.43
2310.232.40.44/3110.232.40.44 – 10.232.40.4510.232.40.45
2410.232.40.46/3110.232.40.46 – 10.232.40.4710.232.40.47
2510.232.40.48/3110.232.40.48 – 10.232.40.4910.232.40.49
2610.232.40.50/3110.232.40.50 – 10.232.40.5110.232.40.51
2710.232.40.52/3110.232.40.52 – 10.232.40.5310.232.40.53
2810.232.40.54/3110.232.40.54 – 10.232.40.5510.232.40.55
2910.232.40.56/3110.232.40.56 – 10.232.40.5710.232.40.57
3010.232.40.58/3110.232.40.58 – 10.232.40.5910.232.40.59
3110.232.40.60/3110.232.40.60 – 10.232.40.6110.232.40.61
3210.232.40.62/3110.232.40.62 – 10.232.40.6310.232.40.63
3310.232.40.64/3110.232.40.64 – 10.232.40.6510.232.40.65
3410.232.40.66/3110.232.40.66 – 10.232.40.6710.232.40.67
3510.232.40.68/3110.232.40.68 – 10.232.40.6910.232.40.69
3610.232.40.70/3110.232.40.70 – 10.232.40.7110.232.40.71
3710.232.40.72/3110.232.40.72 – 10.232.40.7310.232.40.73
3810.232.40.74/3110.232.40.74 – 10.232.40.7510.232.40.75
3910.232.40.76/3110.232.40.76 – 10.232.40.7710.232.40.77
4010.232.40.78/3110.232.40.78 – 10.232.40.7910.232.40.79
4110.232.40.80/3110.232.40.80 – 10.232.40.8110.232.40.81
4210.232.40.82/3110.232.40.82 – 10.232.40.8310.232.40.83
4310.232.40.84/3110.232.40.84 – 10.232.40.8510.232.40.85
4410.232.40.86/3110.232.40.86 – 10.232.40.8710.232.40.87
4510.232.40.88/3110.232.40.88 – 10.232.40.8910.232.40.89
4610.232.40.90/3110.232.40.90 – 10.232.40.9110.232.40.91
4710.232.40.92/3110.232.40.92 – 10.232.40.9310.232.40.93
4810.232.40.94/3110.232.40.94 – 10.232.40.9510.232.40.95
4910.232.40.96/3110.232.40.96 – 10.232.40.9710.232.40.97
5010.232.40.98/3110.232.40.98 – 10.232.40.9910.232.40.99
5110.232.40.100/3110.232.40.100 – 10.232.40.10110.232.40.101
5210.232.40.102/3110.232.40.102 – 10.232.40.10310.232.40.103
5310.232.40.104/3110.232.40.104 – 10.232.40.10510.232.40.105
5410.232.40.106/3110.232.40.106 – 10.232.40.10710.232.40.107
5510.232.40.108/3110.232.40.108 – 10.232.40.10910.232.40.109
5610.232.40.110/3110.232.40.110 – 10.232.40.11110.232.40.111
5710.232.40.112/3110.232.40.112 – 10.232.40.11310.232.40.113
5810.232.40.114/3110.232.40.114 – 10.232.40.11510.232.40.115
5910.232.40.116/3110.232.40.116 – 10.232.40.11710.232.40.117
6010.232.40.118/3110.232.40.118 – 10.232.40.11910.232.40.119
6110.232.40.120/3110.232.40.120 – 10.232.40.12110.232.40.121
6210.232.40.122/3110.232.40.122 – 10.232.40.12310.232.40.123
6310.232.40.124/3110.232.40.124 – 10.232.40.12510.232.40.125
6410.232.40.126/3110.232.40.126 – 10.232.40.12710.232.40.127
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 →