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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)10.166.3.0/25
network10.166.3.0/25
broadcast10.166.3.127
first host10.166.3.1
last host10.166.3.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.166.3.0/25
address00001010.10100110.00000011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100110.00000011.00000000
broadcast00001010.10100110.00000011.01111111
green = network part, grey = host part
hex0x0aa60300
decimal178651904
reverse dns0.3.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.3.0/3110.166.3.0 – 10.166.3.110.166.3.1
210.166.3.2/3110.166.3.2 – 10.166.3.310.166.3.3
310.166.3.4/3110.166.3.4 – 10.166.3.510.166.3.5
410.166.3.6/3110.166.3.6 – 10.166.3.710.166.3.7
510.166.3.8/3110.166.3.8 – 10.166.3.910.166.3.9
610.166.3.10/3110.166.3.10 – 10.166.3.1110.166.3.11
710.166.3.12/3110.166.3.12 – 10.166.3.1310.166.3.13
810.166.3.14/3110.166.3.14 – 10.166.3.1510.166.3.15
910.166.3.16/3110.166.3.16 – 10.166.3.1710.166.3.17
1010.166.3.18/3110.166.3.18 – 10.166.3.1910.166.3.19
1110.166.3.20/3110.166.3.20 – 10.166.3.2110.166.3.21
1210.166.3.22/3110.166.3.22 – 10.166.3.2310.166.3.23
1310.166.3.24/3110.166.3.24 – 10.166.3.2510.166.3.25
1410.166.3.26/3110.166.3.26 – 10.166.3.2710.166.3.27
1510.166.3.28/3110.166.3.28 – 10.166.3.2910.166.3.29
1610.166.3.30/3110.166.3.30 – 10.166.3.3110.166.3.31
1710.166.3.32/3110.166.3.32 – 10.166.3.3310.166.3.33
1810.166.3.34/3110.166.3.34 – 10.166.3.3510.166.3.35
1910.166.3.36/3110.166.3.36 – 10.166.3.3710.166.3.37
2010.166.3.38/3110.166.3.38 – 10.166.3.3910.166.3.39
2110.166.3.40/3110.166.3.40 – 10.166.3.4110.166.3.41
2210.166.3.42/3110.166.3.42 – 10.166.3.4310.166.3.43
2310.166.3.44/3110.166.3.44 – 10.166.3.4510.166.3.45
2410.166.3.46/3110.166.3.46 – 10.166.3.4710.166.3.47
2510.166.3.48/3110.166.3.48 – 10.166.3.4910.166.3.49
2610.166.3.50/3110.166.3.50 – 10.166.3.5110.166.3.51
2710.166.3.52/3110.166.3.52 – 10.166.3.5310.166.3.53
2810.166.3.54/3110.166.3.54 – 10.166.3.5510.166.3.55
2910.166.3.56/3110.166.3.56 – 10.166.3.5710.166.3.57
3010.166.3.58/3110.166.3.58 – 10.166.3.5910.166.3.59
3110.166.3.60/3110.166.3.60 – 10.166.3.6110.166.3.61
3210.166.3.62/3110.166.3.62 – 10.166.3.6310.166.3.63
3310.166.3.64/3110.166.3.64 – 10.166.3.6510.166.3.65
3410.166.3.66/3110.166.3.66 – 10.166.3.6710.166.3.67
3510.166.3.68/3110.166.3.68 – 10.166.3.6910.166.3.69
3610.166.3.70/3110.166.3.70 – 10.166.3.7110.166.3.71
3710.166.3.72/3110.166.3.72 – 10.166.3.7310.166.3.73
3810.166.3.74/3110.166.3.74 – 10.166.3.7510.166.3.75
3910.166.3.76/3110.166.3.76 – 10.166.3.7710.166.3.77
4010.166.3.78/3110.166.3.78 – 10.166.3.7910.166.3.79
4110.166.3.80/3110.166.3.80 – 10.166.3.8110.166.3.81
4210.166.3.82/3110.166.3.82 – 10.166.3.8310.166.3.83
4310.166.3.84/3110.166.3.84 – 10.166.3.8510.166.3.85
4410.166.3.86/3110.166.3.86 – 10.166.3.8710.166.3.87
4510.166.3.88/3110.166.3.88 – 10.166.3.8910.166.3.89
4610.166.3.90/3110.166.3.90 – 10.166.3.9110.166.3.91
4710.166.3.92/3110.166.3.92 – 10.166.3.9310.166.3.93
4810.166.3.94/3110.166.3.94 – 10.166.3.9510.166.3.95
4910.166.3.96/3110.166.3.96 – 10.166.3.9710.166.3.97
5010.166.3.98/3110.166.3.98 – 10.166.3.9910.166.3.99
5110.166.3.100/3110.166.3.100 – 10.166.3.10110.166.3.101
5210.166.3.102/3110.166.3.102 – 10.166.3.10310.166.3.103
5310.166.3.104/3110.166.3.104 – 10.166.3.10510.166.3.105
5410.166.3.106/3110.166.3.106 – 10.166.3.10710.166.3.107
5510.166.3.108/3110.166.3.108 – 10.166.3.10910.166.3.109
5610.166.3.110/3110.166.3.110 – 10.166.3.11110.166.3.111
5710.166.3.112/3110.166.3.112 – 10.166.3.11310.166.3.113
5810.166.3.114/3110.166.3.114 – 10.166.3.11510.166.3.115
5910.166.3.116/3110.166.3.116 – 10.166.3.11710.166.3.117
6010.166.3.118/3110.166.3.118 – 10.166.3.11910.166.3.119
6110.166.3.120/3110.166.3.120 – 10.166.3.12110.166.3.121
6210.166.3.122/3110.166.3.122 – 10.166.3.12310.166.3.123
6310.166.3.124/3110.166.3.124 – 10.166.3.12510.166.3.125
6410.166.3.126/3110.166.3.126 – 10.166.3.12710.166.3.127
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 →