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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)10.40.65.0/25
network10.40.65.0/25
broadcast10.40.65.127
first host10.40.65.1
last host10.40.65.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.40.65.0/25
address00001010.00101000.01000001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00101000.01000001.00000000
broadcast00001010.00101000.01000001.01111111
green = network part, grey = host part
hex0x0a284100
decimal170410240
reverse dns0.65.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:4100

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.40.65.0/3110.40.65.0 – 10.40.65.110.40.65.1
210.40.65.2/3110.40.65.2 – 10.40.65.310.40.65.3
310.40.65.4/3110.40.65.4 – 10.40.65.510.40.65.5
410.40.65.6/3110.40.65.6 – 10.40.65.710.40.65.7
510.40.65.8/3110.40.65.8 – 10.40.65.910.40.65.9
610.40.65.10/3110.40.65.10 – 10.40.65.1110.40.65.11
710.40.65.12/3110.40.65.12 – 10.40.65.1310.40.65.13
810.40.65.14/3110.40.65.14 – 10.40.65.1510.40.65.15
910.40.65.16/3110.40.65.16 – 10.40.65.1710.40.65.17
1010.40.65.18/3110.40.65.18 – 10.40.65.1910.40.65.19
1110.40.65.20/3110.40.65.20 – 10.40.65.2110.40.65.21
1210.40.65.22/3110.40.65.22 – 10.40.65.2310.40.65.23
1310.40.65.24/3110.40.65.24 – 10.40.65.2510.40.65.25
1410.40.65.26/3110.40.65.26 – 10.40.65.2710.40.65.27
1510.40.65.28/3110.40.65.28 – 10.40.65.2910.40.65.29
1610.40.65.30/3110.40.65.30 – 10.40.65.3110.40.65.31
1710.40.65.32/3110.40.65.32 – 10.40.65.3310.40.65.33
1810.40.65.34/3110.40.65.34 – 10.40.65.3510.40.65.35
1910.40.65.36/3110.40.65.36 – 10.40.65.3710.40.65.37
2010.40.65.38/3110.40.65.38 – 10.40.65.3910.40.65.39
2110.40.65.40/3110.40.65.40 – 10.40.65.4110.40.65.41
2210.40.65.42/3110.40.65.42 – 10.40.65.4310.40.65.43
2310.40.65.44/3110.40.65.44 – 10.40.65.4510.40.65.45
2410.40.65.46/3110.40.65.46 – 10.40.65.4710.40.65.47
2510.40.65.48/3110.40.65.48 – 10.40.65.4910.40.65.49
2610.40.65.50/3110.40.65.50 – 10.40.65.5110.40.65.51
2710.40.65.52/3110.40.65.52 – 10.40.65.5310.40.65.53
2810.40.65.54/3110.40.65.54 – 10.40.65.5510.40.65.55
2910.40.65.56/3110.40.65.56 – 10.40.65.5710.40.65.57
3010.40.65.58/3110.40.65.58 – 10.40.65.5910.40.65.59
3110.40.65.60/3110.40.65.60 – 10.40.65.6110.40.65.61
3210.40.65.62/3110.40.65.62 – 10.40.65.6310.40.65.63
3310.40.65.64/3110.40.65.64 – 10.40.65.6510.40.65.65
3410.40.65.66/3110.40.65.66 – 10.40.65.6710.40.65.67
3510.40.65.68/3110.40.65.68 – 10.40.65.6910.40.65.69
3610.40.65.70/3110.40.65.70 – 10.40.65.7110.40.65.71
3710.40.65.72/3110.40.65.72 – 10.40.65.7310.40.65.73
3810.40.65.74/3110.40.65.74 – 10.40.65.7510.40.65.75
3910.40.65.76/3110.40.65.76 – 10.40.65.7710.40.65.77
4010.40.65.78/3110.40.65.78 – 10.40.65.7910.40.65.79
4110.40.65.80/3110.40.65.80 – 10.40.65.8110.40.65.81
4210.40.65.82/3110.40.65.82 – 10.40.65.8310.40.65.83
4310.40.65.84/3110.40.65.84 – 10.40.65.8510.40.65.85
4410.40.65.86/3110.40.65.86 – 10.40.65.8710.40.65.87
4510.40.65.88/3110.40.65.88 – 10.40.65.8910.40.65.89
4610.40.65.90/3110.40.65.90 – 10.40.65.9110.40.65.91
4710.40.65.92/3110.40.65.92 – 10.40.65.9310.40.65.93
4810.40.65.94/3110.40.65.94 – 10.40.65.9510.40.65.95
4910.40.65.96/3110.40.65.96 – 10.40.65.9710.40.65.97
5010.40.65.98/3110.40.65.98 – 10.40.65.9910.40.65.99
5110.40.65.100/3110.40.65.100 – 10.40.65.10110.40.65.101
5210.40.65.102/3110.40.65.102 – 10.40.65.10310.40.65.103
5310.40.65.104/3110.40.65.104 – 10.40.65.10510.40.65.105
5410.40.65.106/3110.40.65.106 – 10.40.65.10710.40.65.107
5510.40.65.108/3110.40.65.108 – 10.40.65.10910.40.65.109
5610.40.65.110/3110.40.65.110 – 10.40.65.11110.40.65.111
5710.40.65.112/3110.40.65.112 – 10.40.65.11310.40.65.113
5810.40.65.114/3110.40.65.114 – 10.40.65.11510.40.65.115
5910.40.65.116/3110.40.65.116 – 10.40.65.11710.40.65.117
6010.40.65.118/3110.40.65.118 – 10.40.65.11910.40.65.119
6110.40.65.120/3110.40.65.120 – 10.40.65.12110.40.65.121
6210.40.65.122/3110.40.65.122 – 10.40.65.12310.40.65.123
6310.40.65.124/3110.40.65.124 – 10.40.65.12510.40.65.125
6410.40.65.126/3110.40.65.126 – 10.40.65.12710.40.65.127
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 →