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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)10.167.248.0/25
network10.167.248.0/25
broadcast10.167.248.127
first host10.167.248.1
last host10.167.248.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.248.0/25
address00001010.10100111.11111000.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.11111000.00000000
broadcast00001010.10100111.11111000.01111111
green = network part, grey = host part
hex0x0aa7f800
decimal178780160
reverse dns0.248.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:f800

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.248.0/3110.167.248.0 – 10.167.248.110.167.248.1
210.167.248.2/3110.167.248.2 – 10.167.248.310.167.248.3
310.167.248.4/3110.167.248.4 – 10.167.248.510.167.248.5
410.167.248.6/3110.167.248.6 – 10.167.248.710.167.248.7
510.167.248.8/3110.167.248.8 – 10.167.248.910.167.248.9
610.167.248.10/3110.167.248.10 – 10.167.248.1110.167.248.11
710.167.248.12/3110.167.248.12 – 10.167.248.1310.167.248.13
810.167.248.14/3110.167.248.14 – 10.167.248.1510.167.248.15
910.167.248.16/3110.167.248.16 – 10.167.248.1710.167.248.17
1010.167.248.18/3110.167.248.18 – 10.167.248.1910.167.248.19
1110.167.248.20/3110.167.248.20 – 10.167.248.2110.167.248.21
1210.167.248.22/3110.167.248.22 – 10.167.248.2310.167.248.23
1310.167.248.24/3110.167.248.24 – 10.167.248.2510.167.248.25
1410.167.248.26/3110.167.248.26 – 10.167.248.2710.167.248.27
1510.167.248.28/3110.167.248.28 – 10.167.248.2910.167.248.29
1610.167.248.30/3110.167.248.30 – 10.167.248.3110.167.248.31
1710.167.248.32/3110.167.248.32 – 10.167.248.3310.167.248.33
1810.167.248.34/3110.167.248.34 – 10.167.248.3510.167.248.35
1910.167.248.36/3110.167.248.36 – 10.167.248.3710.167.248.37
2010.167.248.38/3110.167.248.38 – 10.167.248.3910.167.248.39
2110.167.248.40/3110.167.248.40 – 10.167.248.4110.167.248.41
2210.167.248.42/3110.167.248.42 – 10.167.248.4310.167.248.43
2310.167.248.44/3110.167.248.44 – 10.167.248.4510.167.248.45
2410.167.248.46/3110.167.248.46 – 10.167.248.4710.167.248.47
2510.167.248.48/3110.167.248.48 – 10.167.248.4910.167.248.49
2610.167.248.50/3110.167.248.50 – 10.167.248.5110.167.248.51
2710.167.248.52/3110.167.248.52 – 10.167.248.5310.167.248.53
2810.167.248.54/3110.167.248.54 – 10.167.248.5510.167.248.55
2910.167.248.56/3110.167.248.56 – 10.167.248.5710.167.248.57
3010.167.248.58/3110.167.248.58 – 10.167.248.5910.167.248.59
3110.167.248.60/3110.167.248.60 – 10.167.248.6110.167.248.61
3210.167.248.62/3110.167.248.62 – 10.167.248.6310.167.248.63
3310.167.248.64/3110.167.248.64 – 10.167.248.6510.167.248.65
3410.167.248.66/3110.167.248.66 – 10.167.248.6710.167.248.67
3510.167.248.68/3110.167.248.68 – 10.167.248.6910.167.248.69
3610.167.248.70/3110.167.248.70 – 10.167.248.7110.167.248.71
3710.167.248.72/3110.167.248.72 – 10.167.248.7310.167.248.73
3810.167.248.74/3110.167.248.74 – 10.167.248.7510.167.248.75
3910.167.248.76/3110.167.248.76 – 10.167.248.7710.167.248.77
4010.167.248.78/3110.167.248.78 – 10.167.248.7910.167.248.79
4110.167.248.80/3110.167.248.80 – 10.167.248.8110.167.248.81
4210.167.248.82/3110.167.248.82 – 10.167.248.8310.167.248.83
4310.167.248.84/3110.167.248.84 – 10.167.248.8510.167.248.85
4410.167.248.86/3110.167.248.86 – 10.167.248.8710.167.248.87
4510.167.248.88/3110.167.248.88 – 10.167.248.8910.167.248.89
4610.167.248.90/3110.167.248.90 – 10.167.248.9110.167.248.91
4710.167.248.92/3110.167.248.92 – 10.167.248.9310.167.248.93
4810.167.248.94/3110.167.248.94 – 10.167.248.9510.167.248.95
4910.167.248.96/3110.167.248.96 – 10.167.248.9710.167.248.97
5010.167.248.98/3110.167.248.98 – 10.167.248.9910.167.248.99
5110.167.248.100/3110.167.248.100 – 10.167.248.10110.167.248.101
5210.167.248.102/3110.167.248.102 – 10.167.248.10310.167.248.103
5310.167.248.104/3110.167.248.104 – 10.167.248.10510.167.248.105
5410.167.248.106/3110.167.248.106 – 10.167.248.10710.167.248.107
5510.167.248.108/3110.167.248.108 – 10.167.248.10910.167.248.109
5610.167.248.110/3110.167.248.110 – 10.167.248.11110.167.248.111
5710.167.248.112/3110.167.248.112 – 10.167.248.11310.167.248.113
5810.167.248.114/3110.167.248.114 – 10.167.248.11510.167.248.115
5910.167.248.116/3110.167.248.116 – 10.167.248.11710.167.248.117
6010.167.248.118/3110.167.248.118 – 10.167.248.11910.167.248.119
6110.167.248.120/3110.167.248.120 – 10.167.248.12110.167.248.121
6210.167.248.122/3110.167.248.122 – 10.167.248.12310.167.248.123
6310.167.248.124/3110.167.248.124 – 10.167.248.12510.167.248.125
6410.167.248.126/3110.167.248.126 – 10.167.248.12710.167.248.127
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 →