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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)10.2.197.0/25
network10.2.197.0/25
broadcast10.2.197.127
first host10.2.197.1
last host10.2.197.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.197.0/25
address00001010.00000010.11000101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.11000101.00000000
broadcast00001010.00000010.11000101.01111111
green = network part, grey = host part
hex0x0a02c500
decimal167953664
reverse dns0.197.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:c500

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.197.0/3110.2.197.0 – 10.2.197.110.2.197.1
210.2.197.2/3110.2.197.2 – 10.2.197.310.2.197.3
310.2.197.4/3110.2.197.4 – 10.2.197.510.2.197.5
410.2.197.6/3110.2.197.6 – 10.2.197.710.2.197.7
510.2.197.8/3110.2.197.8 – 10.2.197.910.2.197.9
610.2.197.10/3110.2.197.10 – 10.2.197.1110.2.197.11
710.2.197.12/3110.2.197.12 – 10.2.197.1310.2.197.13
810.2.197.14/3110.2.197.14 – 10.2.197.1510.2.197.15
910.2.197.16/3110.2.197.16 – 10.2.197.1710.2.197.17
1010.2.197.18/3110.2.197.18 – 10.2.197.1910.2.197.19
1110.2.197.20/3110.2.197.20 – 10.2.197.2110.2.197.21
1210.2.197.22/3110.2.197.22 – 10.2.197.2310.2.197.23
1310.2.197.24/3110.2.197.24 – 10.2.197.2510.2.197.25
1410.2.197.26/3110.2.197.26 – 10.2.197.2710.2.197.27
1510.2.197.28/3110.2.197.28 – 10.2.197.2910.2.197.29
1610.2.197.30/3110.2.197.30 – 10.2.197.3110.2.197.31
1710.2.197.32/3110.2.197.32 – 10.2.197.3310.2.197.33
1810.2.197.34/3110.2.197.34 – 10.2.197.3510.2.197.35
1910.2.197.36/3110.2.197.36 – 10.2.197.3710.2.197.37
2010.2.197.38/3110.2.197.38 – 10.2.197.3910.2.197.39
2110.2.197.40/3110.2.197.40 – 10.2.197.4110.2.197.41
2210.2.197.42/3110.2.197.42 – 10.2.197.4310.2.197.43
2310.2.197.44/3110.2.197.44 – 10.2.197.4510.2.197.45
2410.2.197.46/3110.2.197.46 – 10.2.197.4710.2.197.47
2510.2.197.48/3110.2.197.48 – 10.2.197.4910.2.197.49
2610.2.197.50/3110.2.197.50 – 10.2.197.5110.2.197.51
2710.2.197.52/3110.2.197.52 – 10.2.197.5310.2.197.53
2810.2.197.54/3110.2.197.54 – 10.2.197.5510.2.197.55
2910.2.197.56/3110.2.197.56 – 10.2.197.5710.2.197.57
3010.2.197.58/3110.2.197.58 – 10.2.197.5910.2.197.59
3110.2.197.60/3110.2.197.60 – 10.2.197.6110.2.197.61
3210.2.197.62/3110.2.197.62 – 10.2.197.6310.2.197.63
3310.2.197.64/3110.2.197.64 – 10.2.197.6510.2.197.65
3410.2.197.66/3110.2.197.66 – 10.2.197.6710.2.197.67
3510.2.197.68/3110.2.197.68 – 10.2.197.6910.2.197.69
3610.2.197.70/3110.2.197.70 – 10.2.197.7110.2.197.71
3710.2.197.72/3110.2.197.72 – 10.2.197.7310.2.197.73
3810.2.197.74/3110.2.197.74 – 10.2.197.7510.2.197.75
3910.2.197.76/3110.2.197.76 – 10.2.197.7710.2.197.77
4010.2.197.78/3110.2.197.78 – 10.2.197.7910.2.197.79
4110.2.197.80/3110.2.197.80 – 10.2.197.8110.2.197.81
4210.2.197.82/3110.2.197.82 – 10.2.197.8310.2.197.83
4310.2.197.84/3110.2.197.84 – 10.2.197.8510.2.197.85
4410.2.197.86/3110.2.197.86 – 10.2.197.8710.2.197.87
4510.2.197.88/3110.2.197.88 – 10.2.197.8910.2.197.89
4610.2.197.90/3110.2.197.90 – 10.2.197.9110.2.197.91
4710.2.197.92/3110.2.197.92 – 10.2.197.9310.2.197.93
4810.2.197.94/3110.2.197.94 – 10.2.197.9510.2.197.95
4910.2.197.96/3110.2.197.96 – 10.2.197.9710.2.197.97
5010.2.197.98/3110.2.197.98 – 10.2.197.9910.2.197.99
5110.2.197.100/3110.2.197.100 – 10.2.197.10110.2.197.101
5210.2.197.102/3110.2.197.102 – 10.2.197.10310.2.197.103
5310.2.197.104/3110.2.197.104 – 10.2.197.10510.2.197.105
5410.2.197.106/3110.2.197.106 – 10.2.197.10710.2.197.107
5510.2.197.108/3110.2.197.108 – 10.2.197.10910.2.197.109
5610.2.197.110/3110.2.197.110 – 10.2.197.11110.2.197.111
5710.2.197.112/3110.2.197.112 – 10.2.197.11310.2.197.113
5810.2.197.114/3110.2.197.114 – 10.2.197.11510.2.197.115
5910.2.197.116/3110.2.197.116 – 10.2.197.11710.2.197.117
6010.2.197.118/3110.2.197.118 – 10.2.197.11910.2.197.119
6110.2.197.120/3110.2.197.120 – 10.2.197.12110.2.197.121
6210.2.197.122/3110.2.197.122 – 10.2.197.12310.2.197.123
6310.2.197.124/3110.2.197.124 – 10.2.197.12510.2.197.125
6410.2.197.126/3110.2.197.126 – 10.2.197.12710.2.197.127
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 →