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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)10.2.28.0/25
network10.2.28.0/25
broadcast10.2.28.127
first host10.2.28.1
last host10.2.28.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.28.0/25
address00001010.00000010.00011100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00011100.00000000
broadcast00001010.00000010.00011100.01111111
green = network part, grey = host part
hex0x0a021c00
decimal167910400
reverse dns0.28.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1c00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.28.0/3110.2.28.0 – 10.2.28.110.2.28.1
210.2.28.2/3110.2.28.2 – 10.2.28.310.2.28.3
310.2.28.4/3110.2.28.4 – 10.2.28.510.2.28.5
410.2.28.6/3110.2.28.6 – 10.2.28.710.2.28.7
510.2.28.8/3110.2.28.8 – 10.2.28.910.2.28.9
610.2.28.10/3110.2.28.10 – 10.2.28.1110.2.28.11
710.2.28.12/3110.2.28.12 – 10.2.28.1310.2.28.13
810.2.28.14/3110.2.28.14 – 10.2.28.1510.2.28.15
910.2.28.16/3110.2.28.16 – 10.2.28.1710.2.28.17
1010.2.28.18/3110.2.28.18 – 10.2.28.1910.2.28.19
1110.2.28.20/3110.2.28.20 – 10.2.28.2110.2.28.21
1210.2.28.22/3110.2.28.22 – 10.2.28.2310.2.28.23
1310.2.28.24/3110.2.28.24 – 10.2.28.2510.2.28.25
1410.2.28.26/3110.2.28.26 – 10.2.28.2710.2.28.27
1510.2.28.28/3110.2.28.28 – 10.2.28.2910.2.28.29
1610.2.28.30/3110.2.28.30 – 10.2.28.3110.2.28.31
1710.2.28.32/3110.2.28.32 – 10.2.28.3310.2.28.33
1810.2.28.34/3110.2.28.34 – 10.2.28.3510.2.28.35
1910.2.28.36/3110.2.28.36 – 10.2.28.3710.2.28.37
2010.2.28.38/3110.2.28.38 – 10.2.28.3910.2.28.39
2110.2.28.40/3110.2.28.40 – 10.2.28.4110.2.28.41
2210.2.28.42/3110.2.28.42 – 10.2.28.4310.2.28.43
2310.2.28.44/3110.2.28.44 – 10.2.28.4510.2.28.45
2410.2.28.46/3110.2.28.46 – 10.2.28.4710.2.28.47
2510.2.28.48/3110.2.28.48 – 10.2.28.4910.2.28.49
2610.2.28.50/3110.2.28.50 – 10.2.28.5110.2.28.51
2710.2.28.52/3110.2.28.52 – 10.2.28.5310.2.28.53
2810.2.28.54/3110.2.28.54 – 10.2.28.5510.2.28.55
2910.2.28.56/3110.2.28.56 – 10.2.28.5710.2.28.57
3010.2.28.58/3110.2.28.58 – 10.2.28.5910.2.28.59
3110.2.28.60/3110.2.28.60 – 10.2.28.6110.2.28.61
3210.2.28.62/3110.2.28.62 – 10.2.28.6310.2.28.63
3310.2.28.64/3110.2.28.64 – 10.2.28.6510.2.28.65
3410.2.28.66/3110.2.28.66 – 10.2.28.6710.2.28.67
3510.2.28.68/3110.2.28.68 – 10.2.28.6910.2.28.69
3610.2.28.70/3110.2.28.70 – 10.2.28.7110.2.28.71
3710.2.28.72/3110.2.28.72 – 10.2.28.7310.2.28.73
3810.2.28.74/3110.2.28.74 – 10.2.28.7510.2.28.75
3910.2.28.76/3110.2.28.76 – 10.2.28.7710.2.28.77
4010.2.28.78/3110.2.28.78 – 10.2.28.7910.2.28.79
4110.2.28.80/3110.2.28.80 – 10.2.28.8110.2.28.81
4210.2.28.82/3110.2.28.82 – 10.2.28.8310.2.28.83
4310.2.28.84/3110.2.28.84 – 10.2.28.8510.2.28.85
4410.2.28.86/3110.2.28.86 – 10.2.28.8710.2.28.87
4510.2.28.88/3110.2.28.88 – 10.2.28.8910.2.28.89
4610.2.28.90/3110.2.28.90 – 10.2.28.9110.2.28.91
4710.2.28.92/3110.2.28.92 – 10.2.28.9310.2.28.93
4810.2.28.94/3110.2.28.94 – 10.2.28.9510.2.28.95
4910.2.28.96/3110.2.28.96 – 10.2.28.9710.2.28.97
5010.2.28.98/3110.2.28.98 – 10.2.28.9910.2.28.99
5110.2.28.100/3110.2.28.100 – 10.2.28.10110.2.28.101
5210.2.28.102/3110.2.28.102 – 10.2.28.10310.2.28.103
5310.2.28.104/3110.2.28.104 – 10.2.28.10510.2.28.105
5410.2.28.106/3110.2.28.106 – 10.2.28.10710.2.28.107
5510.2.28.108/3110.2.28.108 – 10.2.28.10910.2.28.109
5610.2.28.110/3110.2.28.110 – 10.2.28.11110.2.28.111
5710.2.28.112/3110.2.28.112 – 10.2.28.11310.2.28.113
5810.2.28.114/3110.2.28.114 – 10.2.28.11510.2.28.115
5910.2.28.116/3110.2.28.116 – 10.2.28.11710.2.28.117
6010.2.28.118/3110.2.28.118 – 10.2.28.11910.2.28.119
6110.2.28.120/3110.2.28.120 – 10.2.28.12110.2.28.121
6210.2.28.122/3110.2.28.122 – 10.2.28.12310.2.28.123
6310.2.28.124/3110.2.28.124 – 10.2.28.12510.2.28.125
6410.2.28.126/3110.2.28.126 – 10.2.28.12710.2.28.127
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 →