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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)10.75.2.0/25
network10.75.2.0/25
broadcast10.75.2.127
first host10.75.2.1
last host10.75.2.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.75.2.0/25
address00001010.01001011.00000010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01001011.00000010.00000000
broadcast00001010.01001011.00000010.01111111
green = network part, grey = host part
hex0x0a4b0200
decimal172687872
reverse dns0.2.75.10.in-addr.arpa
ipv4-mapped::ffff:a4b:200

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.75.2.0/3110.75.2.0 – 10.75.2.110.75.2.1
210.75.2.2/3110.75.2.2 – 10.75.2.310.75.2.3
310.75.2.4/3110.75.2.4 – 10.75.2.510.75.2.5
410.75.2.6/3110.75.2.6 – 10.75.2.710.75.2.7
510.75.2.8/3110.75.2.8 – 10.75.2.910.75.2.9
610.75.2.10/3110.75.2.10 – 10.75.2.1110.75.2.11
710.75.2.12/3110.75.2.12 – 10.75.2.1310.75.2.13
810.75.2.14/3110.75.2.14 – 10.75.2.1510.75.2.15
910.75.2.16/3110.75.2.16 – 10.75.2.1710.75.2.17
1010.75.2.18/3110.75.2.18 – 10.75.2.1910.75.2.19
1110.75.2.20/3110.75.2.20 – 10.75.2.2110.75.2.21
1210.75.2.22/3110.75.2.22 – 10.75.2.2310.75.2.23
1310.75.2.24/3110.75.2.24 – 10.75.2.2510.75.2.25
1410.75.2.26/3110.75.2.26 – 10.75.2.2710.75.2.27
1510.75.2.28/3110.75.2.28 – 10.75.2.2910.75.2.29
1610.75.2.30/3110.75.2.30 – 10.75.2.3110.75.2.31
1710.75.2.32/3110.75.2.32 – 10.75.2.3310.75.2.33
1810.75.2.34/3110.75.2.34 – 10.75.2.3510.75.2.35
1910.75.2.36/3110.75.2.36 – 10.75.2.3710.75.2.37
2010.75.2.38/3110.75.2.38 – 10.75.2.3910.75.2.39
2110.75.2.40/3110.75.2.40 – 10.75.2.4110.75.2.41
2210.75.2.42/3110.75.2.42 – 10.75.2.4310.75.2.43
2310.75.2.44/3110.75.2.44 – 10.75.2.4510.75.2.45
2410.75.2.46/3110.75.2.46 – 10.75.2.4710.75.2.47
2510.75.2.48/3110.75.2.48 – 10.75.2.4910.75.2.49
2610.75.2.50/3110.75.2.50 – 10.75.2.5110.75.2.51
2710.75.2.52/3110.75.2.52 – 10.75.2.5310.75.2.53
2810.75.2.54/3110.75.2.54 – 10.75.2.5510.75.2.55
2910.75.2.56/3110.75.2.56 – 10.75.2.5710.75.2.57
3010.75.2.58/3110.75.2.58 – 10.75.2.5910.75.2.59
3110.75.2.60/3110.75.2.60 – 10.75.2.6110.75.2.61
3210.75.2.62/3110.75.2.62 – 10.75.2.6310.75.2.63
3310.75.2.64/3110.75.2.64 – 10.75.2.6510.75.2.65
3410.75.2.66/3110.75.2.66 – 10.75.2.6710.75.2.67
3510.75.2.68/3110.75.2.68 – 10.75.2.6910.75.2.69
3610.75.2.70/3110.75.2.70 – 10.75.2.7110.75.2.71
3710.75.2.72/3110.75.2.72 – 10.75.2.7310.75.2.73
3810.75.2.74/3110.75.2.74 – 10.75.2.7510.75.2.75
3910.75.2.76/3110.75.2.76 – 10.75.2.7710.75.2.77
4010.75.2.78/3110.75.2.78 – 10.75.2.7910.75.2.79
4110.75.2.80/3110.75.2.80 – 10.75.2.8110.75.2.81
4210.75.2.82/3110.75.2.82 – 10.75.2.8310.75.2.83
4310.75.2.84/3110.75.2.84 – 10.75.2.8510.75.2.85
4410.75.2.86/3110.75.2.86 – 10.75.2.8710.75.2.87
4510.75.2.88/3110.75.2.88 – 10.75.2.8910.75.2.89
4610.75.2.90/3110.75.2.90 – 10.75.2.9110.75.2.91
4710.75.2.92/3110.75.2.92 – 10.75.2.9310.75.2.93
4810.75.2.94/3110.75.2.94 – 10.75.2.9510.75.2.95
4910.75.2.96/3110.75.2.96 – 10.75.2.9710.75.2.97
5010.75.2.98/3110.75.2.98 – 10.75.2.9910.75.2.99
5110.75.2.100/3110.75.2.100 – 10.75.2.10110.75.2.101
5210.75.2.102/3110.75.2.102 – 10.75.2.10310.75.2.103
5310.75.2.104/3110.75.2.104 – 10.75.2.10510.75.2.105
5410.75.2.106/3110.75.2.106 – 10.75.2.10710.75.2.107
5510.75.2.108/3110.75.2.108 – 10.75.2.10910.75.2.109
5610.75.2.110/3110.75.2.110 – 10.75.2.11110.75.2.111
5710.75.2.112/3110.75.2.112 – 10.75.2.11310.75.2.113
5810.75.2.114/3110.75.2.114 – 10.75.2.11510.75.2.115
5910.75.2.116/3110.75.2.116 – 10.75.2.11710.75.2.117
6010.75.2.118/3110.75.2.118 – 10.75.2.11910.75.2.119
6110.75.2.120/3110.75.2.120 – 10.75.2.12110.75.2.121
6210.75.2.122/3110.75.2.122 – 10.75.2.12310.75.2.123
6310.75.2.124/3110.75.2.124 – 10.75.2.12510.75.2.125
6410.75.2.126/3110.75.2.126 – 10.75.2.12710.75.2.127
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 →