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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)10.2.50.0/25
network10.2.50.0/25
broadcast10.2.50.127
first host10.2.50.1
last host10.2.50.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.50.0/25
address00001010.00000010.00110010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00110010.00000000
broadcast00001010.00000010.00110010.01111111
green = network part, grey = host part
hex0x0a023200
decimal167916032
reverse dns0.50.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3200

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.50.0/3110.2.50.0 – 10.2.50.110.2.50.1
210.2.50.2/3110.2.50.2 – 10.2.50.310.2.50.3
310.2.50.4/3110.2.50.4 – 10.2.50.510.2.50.5
410.2.50.6/3110.2.50.6 – 10.2.50.710.2.50.7
510.2.50.8/3110.2.50.8 – 10.2.50.910.2.50.9
610.2.50.10/3110.2.50.10 – 10.2.50.1110.2.50.11
710.2.50.12/3110.2.50.12 – 10.2.50.1310.2.50.13
810.2.50.14/3110.2.50.14 – 10.2.50.1510.2.50.15
910.2.50.16/3110.2.50.16 – 10.2.50.1710.2.50.17
1010.2.50.18/3110.2.50.18 – 10.2.50.1910.2.50.19
1110.2.50.20/3110.2.50.20 – 10.2.50.2110.2.50.21
1210.2.50.22/3110.2.50.22 – 10.2.50.2310.2.50.23
1310.2.50.24/3110.2.50.24 – 10.2.50.2510.2.50.25
1410.2.50.26/3110.2.50.26 – 10.2.50.2710.2.50.27
1510.2.50.28/3110.2.50.28 – 10.2.50.2910.2.50.29
1610.2.50.30/3110.2.50.30 – 10.2.50.3110.2.50.31
1710.2.50.32/3110.2.50.32 – 10.2.50.3310.2.50.33
1810.2.50.34/3110.2.50.34 – 10.2.50.3510.2.50.35
1910.2.50.36/3110.2.50.36 – 10.2.50.3710.2.50.37
2010.2.50.38/3110.2.50.38 – 10.2.50.3910.2.50.39
2110.2.50.40/3110.2.50.40 – 10.2.50.4110.2.50.41
2210.2.50.42/3110.2.50.42 – 10.2.50.4310.2.50.43
2310.2.50.44/3110.2.50.44 – 10.2.50.4510.2.50.45
2410.2.50.46/3110.2.50.46 – 10.2.50.4710.2.50.47
2510.2.50.48/3110.2.50.48 – 10.2.50.4910.2.50.49
2610.2.50.50/3110.2.50.50 – 10.2.50.5110.2.50.51
2710.2.50.52/3110.2.50.52 – 10.2.50.5310.2.50.53
2810.2.50.54/3110.2.50.54 – 10.2.50.5510.2.50.55
2910.2.50.56/3110.2.50.56 – 10.2.50.5710.2.50.57
3010.2.50.58/3110.2.50.58 – 10.2.50.5910.2.50.59
3110.2.50.60/3110.2.50.60 – 10.2.50.6110.2.50.61
3210.2.50.62/3110.2.50.62 – 10.2.50.6310.2.50.63
3310.2.50.64/3110.2.50.64 – 10.2.50.6510.2.50.65
3410.2.50.66/3110.2.50.66 – 10.2.50.6710.2.50.67
3510.2.50.68/3110.2.50.68 – 10.2.50.6910.2.50.69
3610.2.50.70/3110.2.50.70 – 10.2.50.7110.2.50.71
3710.2.50.72/3110.2.50.72 – 10.2.50.7310.2.50.73
3810.2.50.74/3110.2.50.74 – 10.2.50.7510.2.50.75
3910.2.50.76/3110.2.50.76 – 10.2.50.7710.2.50.77
4010.2.50.78/3110.2.50.78 – 10.2.50.7910.2.50.79
4110.2.50.80/3110.2.50.80 – 10.2.50.8110.2.50.81
4210.2.50.82/3110.2.50.82 – 10.2.50.8310.2.50.83
4310.2.50.84/3110.2.50.84 – 10.2.50.8510.2.50.85
4410.2.50.86/3110.2.50.86 – 10.2.50.8710.2.50.87
4510.2.50.88/3110.2.50.88 – 10.2.50.8910.2.50.89
4610.2.50.90/3110.2.50.90 – 10.2.50.9110.2.50.91
4710.2.50.92/3110.2.50.92 – 10.2.50.9310.2.50.93
4810.2.50.94/3110.2.50.94 – 10.2.50.9510.2.50.95
4910.2.50.96/3110.2.50.96 – 10.2.50.9710.2.50.97
5010.2.50.98/3110.2.50.98 – 10.2.50.9910.2.50.99
5110.2.50.100/3110.2.50.100 – 10.2.50.10110.2.50.101
5210.2.50.102/3110.2.50.102 – 10.2.50.10310.2.50.103
5310.2.50.104/3110.2.50.104 – 10.2.50.10510.2.50.105
5410.2.50.106/3110.2.50.106 – 10.2.50.10710.2.50.107
5510.2.50.108/3110.2.50.108 – 10.2.50.10910.2.50.109
5610.2.50.110/3110.2.50.110 – 10.2.50.11110.2.50.111
5710.2.50.112/3110.2.50.112 – 10.2.50.11310.2.50.113
5810.2.50.114/3110.2.50.114 – 10.2.50.11510.2.50.115
5910.2.50.116/3110.2.50.116 – 10.2.50.11710.2.50.117
6010.2.50.118/3110.2.50.118 – 10.2.50.11910.2.50.119
6110.2.50.120/3110.2.50.120 – 10.2.50.12110.2.50.121
6210.2.50.122/3110.2.50.122 – 10.2.50.12310.2.50.123
6310.2.50.124/3110.2.50.124 – 10.2.50.12510.2.50.125
6410.2.50.126/3110.2.50.126 – 10.2.50.12710.2.50.127
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 →