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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)10.40.7.0/25
network10.40.7.0/25
broadcast10.40.7.127
first host10.40.7.1
last host10.40.7.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.40.7.0/25
address00001010.00101000.00000111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00101000.00000111.00000000
broadcast00001010.00101000.00000111.01111111
green = network part, grey = host part
hex0x0a280700
decimal170395392
reverse dns0.7.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:700

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.40.7.0/3110.40.7.0 – 10.40.7.110.40.7.1
210.40.7.2/3110.40.7.2 – 10.40.7.310.40.7.3
310.40.7.4/3110.40.7.4 – 10.40.7.510.40.7.5
410.40.7.6/3110.40.7.6 – 10.40.7.710.40.7.7
510.40.7.8/3110.40.7.8 – 10.40.7.910.40.7.9
610.40.7.10/3110.40.7.10 – 10.40.7.1110.40.7.11
710.40.7.12/3110.40.7.12 – 10.40.7.1310.40.7.13
810.40.7.14/3110.40.7.14 – 10.40.7.1510.40.7.15
910.40.7.16/3110.40.7.16 – 10.40.7.1710.40.7.17
1010.40.7.18/3110.40.7.18 – 10.40.7.1910.40.7.19
1110.40.7.20/3110.40.7.20 – 10.40.7.2110.40.7.21
1210.40.7.22/3110.40.7.22 – 10.40.7.2310.40.7.23
1310.40.7.24/3110.40.7.24 – 10.40.7.2510.40.7.25
1410.40.7.26/3110.40.7.26 – 10.40.7.2710.40.7.27
1510.40.7.28/3110.40.7.28 – 10.40.7.2910.40.7.29
1610.40.7.30/3110.40.7.30 – 10.40.7.3110.40.7.31
1710.40.7.32/3110.40.7.32 – 10.40.7.3310.40.7.33
1810.40.7.34/3110.40.7.34 – 10.40.7.3510.40.7.35
1910.40.7.36/3110.40.7.36 – 10.40.7.3710.40.7.37
2010.40.7.38/3110.40.7.38 – 10.40.7.3910.40.7.39
2110.40.7.40/3110.40.7.40 – 10.40.7.4110.40.7.41
2210.40.7.42/3110.40.7.42 – 10.40.7.4310.40.7.43
2310.40.7.44/3110.40.7.44 – 10.40.7.4510.40.7.45
2410.40.7.46/3110.40.7.46 – 10.40.7.4710.40.7.47
2510.40.7.48/3110.40.7.48 – 10.40.7.4910.40.7.49
2610.40.7.50/3110.40.7.50 – 10.40.7.5110.40.7.51
2710.40.7.52/3110.40.7.52 – 10.40.7.5310.40.7.53
2810.40.7.54/3110.40.7.54 – 10.40.7.5510.40.7.55
2910.40.7.56/3110.40.7.56 – 10.40.7.5710.40.7.57
3010.40.7.58/3110.40.7.58 – 10.40.7.5910.40.7.59
3110.40.7.60/3110.40.7.60 – 10.40.7.6110.40.7.61
3210.40.7.62/3110.40.7.62 – 10.40.7.6310.40.7.63
3310.40.7.64/3110.40.7.64 – 10.40.7.6510.40.7.65
3410.40.7.66/3110.40.7.66 – 10.40.7.6710.40.7.67
3510.40.7.68/3110.40.7.68 – 10.40.7.6910.40.7.69
3610.40.7.70/3110.40.7.70 – 10.40.7.7110.40.7.71
3710.40.7.72/3110.40.7.72 – 10.40.7.7310.40.7.73
3810.40.7.74/3110.40.7.74 – 10.40.7.7510.40.7.75
3910.40.7.76/3110.40.7.76 – 10.40.7.7710.40.7.77
4010.40.7.78/3110.40.7.78 – 10.40.7.7910.40.7.79
4110.40.7.80/3110.40.7.80 – 10.40.7.8110.40.7.81
4210.40.7.82/3110.40.7.82 – 10.40.7.8310.40.7.83
4310.40.7.84/3110.40.7.84 – 10.40.7.8510.40.7.85
4410.40.7.86/3110.40.7.86 – 10.40.7.8710.40.7.87
4510.40.7.88/3110.40.7.88 – 10.40.7.8910.40.7.89
4610.40.7.90/3110.40.7.90 – 10.40.7.9110.40.7.91
4710.40.7.92/3110.40.7.92 – 10.40.7.9310.40.7.93
4810.40.7.94/3110.40.7.94 – 10.40.7.9510.40.7.95
4910.40.7.96/3110.40.7.96 – 10.40.7.9710.40.7.97
5010.40.7.98/3110.40.7.98 – 10.40.7.9910.40.7.99
5110.40.7.100/3110.40.7.100 – 10.40.7.10110.40.7.101
5210.40.7.102/3110.40.7.102 – 10.40.7.10310.40.7.103
5310.40.7.104/3110.40.7.104 – 10.40.7.10510.40.7.105
5410.40.7.106/3110.40.7.106 – 10.40.7.10710.40.7.107
5510.40.7.108/3110.40.7.108 – 10.40.7.10910.40.7.109
5610.40.7.110/3110.40.7.110 – 10.40.7.11110.40.7.111
5710.40.7.112/3110.40.7.112 – 10.40.7.11310.40.7.113
5810.40.7.114/3110.40.7.114 – 10.40.7.11510.40.7.115
5910.40.7.116/3110.40.7.116 – 10.40.7.11710.40.7.117
6010.40.7.118/3110.40.7.118 – 10.40.7.11910.40.7.119
6110.40.7.120/3110.40.7.120 – 10.40.7.12110.40.7.121
6210.40.7.122/3110.40.7.122 – 10.40.7.12310.40.7.123
6310.40.7.124/3110.40.7.124 – 10.40.7.12510.40.7.125
6410.40.7.126/3110.40.7.126 – 10.40.7.12710.40.7.127
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 →