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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)10.2.103.0/25
network10.2.103.0/25
broadcast10.2.103.127
first host10.2.103.1
last host10.2.103.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.103.0/25
address00001010.00000010.01100111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01100111.00000000
broadcast00001010.00000010.01100111.01111111
green = network part, grey = host part
hex0x0a026700
decimal167929600
reverse dns0.103.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:6700

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.103.0/3110.2.103.0 – 10.2.103.110.2.103.1
210.2.103.2/3110.2.103.2 – 10.2.103.310.2.103.3
310.2.103.4/3110.2.103.4 – 10.2.103.510.2.103.5
410.2.103.6/3110.2.103.6 – 10.2.103.710.2.103.7
510.2.103.8/3110.2.103.8 – 10.2.103.910.2.103.9
610.2.103.10/3110.2.103.10 – 10.2.103.1110.2.103.11
710.2.103.12/3110.2.103.12 – 10.2.103.1310.2.103.13
810.2.103.14/3110.2.103.14 – 10.2.103.1510.2.103.15
910.2.103.16/3110.2.103.16 – 10.2.103.1710.2.103.17
1010.2.103.18/3110.2.103.18 – 10.2.103.1910.2.103.19
1110.2.103.20/3110.2.103.20 – 10.2.103.2110.2.103.21
1210.2.103.22/3110.2.103.22 – 10.2.103.2310.2.103.23
1310.2.103.24/3110.2.103.24 – 10.2.103.2510.2.103.25
1410.2.103.26/3110.2.103.26 – 10.2.103.2710.2.103.27
1510.2.103.28/3110.2.103.28 – 10.2.103.2910.2.103.29
1610.2.103.30/3110.2.103.30 – 10.2.103.3110.2.103.31
1710.2.103.32/3110.2.103.32 – 10.2.103.3310.2.103.33
1810.2.103.34/3110.2.103.34 – 10.2.103.3510.2.103.35
1910.2.103.36/3110.2.103.36 – 10.2.103.3710.2.103.37
2010.2.103.38/3110.2.103.38 – 10.2.103.3910.2.103.39
2110.2.103.40/3110.2.103.40 – 10.2.103.4110.2.103.41
2210.2.103.42/3110.2.103.42 – 10.2.103.4310.2.103.43
2310.2.103.44/3110.2.103.44 – 10.2.103.4510.2.103.45
2410.2.103.46/3110.2.103.46 – 10.2.103.4710.2.103.47
2510.2.103.48/3110.2.103.48 – 10.2.103.4910.2.103.49
2610.2.103.50/3110.2.103.50 – 10.2.103.5110.2.103.51
2710.2.103.52/3110.2.103.52 – 10.2.103.5310.2.103.53
2810.2.103.54/3110.2.103.54 – 10.2.103.5510.2.103.55
2910.2.103.56/3110.2.103.56 – 10.2.103.5710.2.103.57
3010.2.103.58/3110.2.103.58 – 10.2.103.5910.2.103.59
3110.2.103.60/3110.2.103.60 – 10.2.103.6110.2.103.61
3210.2.103.62/3110.2.103.62 – 10.2.103.6310.2.103.63
3310.2.103.64/3110.2.103.64 – 10.2.103.6510.2.103.65
3410.2.103.66/3110.2.103.66 – 10.2.103.6710.2.103.67
3510.2.103.68/3110.2.103.68 – 10.2.103.6910.2.103.69
3610.2.103.70/3110.2.103.70 – 10.2.103.7110.2.103.71
3710.2.103.72/3110.2.103.72 – 10.2.103.7310.2.103.73
3810.2.103.74/3110.2.103.74 – 10.2.103.7510.2.103.75
3910.2.103.76/3110.2.103.76 – 10.2.103.7710.2.103.77
4010.2.103.78/3110.2.103.78 – 10.2.103.7910.2.103.79
4110.2.103.80/3110.2.103.80 – 10.2.103.8110.2.103.81
4210.2.103.82/3110.2.103.82 – 10.2.103.8310.2.103.83
4310.2.103.84/3110.2.103.84 – 10.2.103.8510.2.103.85
4410.2.103.86/3110.2.103.86 – 10.2.103.8710.2.103.87
4510.2.103.88/3110.2.103.88 – 10.2.103.8910.2.103.89
4610.2.103.90/3110.2.103.90 – 10.2.103.9110.2.103.91
4710.2.103.92/3110.2.103.92 – 10.2.103.9310.2.103.93
4810.2.103.94/3110.2.103.94 – 10.2.103.9510.2.103.95
4910.2.103.96/3110.2.103.96 – 10.2.103.9710.2.103.97
5010.2.103.98/3110.2.103.98 – 10.2.103.9910.2.103.99
5110.2.103.100/3110.2.103.100 – 10.2.103.10110.2.103.101
5210.2.103.102/3110.2.103.102 – 10.2.103.10310.2.103.103
5310.2.103.104/3110.2.103.104 – 10.2.103.10510.2.103.105
5410.2.103.106/3110.2.103.106 – 10.2.103.10710.2.103.107
5510.2.103.108/3110.2.103.108 – 10.2.103.10910.2.103.109
5610.2.103.110/3110.2.103.110 – 10.2.103.11110.2.103.111
5710.2.103.112/3110.2.103.112 – 10.2.103.11310.2.103.113
5810.2.103.114/3110.2.103.114 – 10.2.103.11510.2.103.115
5910.2.103.116/3110.2.103.116 – 10.2.103.11710.2.103.117
6010.2.103.118/3110.2.103.118 – 10.2.103.11910.2.103.119
6110.2.103.120/3110.2.103.120 – 10.2.103.12110.2.103.121
6210.2.103.122/3110.2.103.122 – 10.2.103.12310.2.103.123
6310.2.103.124/3110.2.103.124 – 10.2.103.12510.2.103.125
6410.2.103.126/3110.2.103.126 – 10.2.103.12710.2.103.127
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 →