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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)10.71.9.0/25
network10.71.9.0/25
broadcast10.71.9.127
first host10.71.9.1
last host10.71.9.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.71.9.0/25
address00001010.01000111.00001001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01000111.00001001.00000000
broadcast00001010.01000111.00001001.01111111
green = network part, grey = host part
hex0x0a470900
decimal172427520
reverse dns0.9.71.10.in-addr.arpa
ipv4-mapped::ffff:a47:900

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.71.9.0/3110.71.9.0 – 10.71.9.110.71.9.1
210.71.9.2/3110.71.9.2 – 10.71.9.310.71.9.3
310.71.9.4/3110.71.9.4 – 10.71.9.510.71.9.5
410.71.9.6/3110.71.9.6 – 10.71.9.710.71.9.7
510.71.9.8/3110.71.9.8 – 10.71.9.910.71.9.9
610.71.9.10/3110.71.9.10 – 10.71.9.1110.71.9.11
710.71.9.12/3110.71.9.12 – 10.71.9.1310.71.9.13
810.71.9.14/3110.71.9.14 – 10.71.9.1510.71.9.15
910.71.9.16/3110.71.9.16 – 10.71.9.1710.71.9.17
1010.71.9.18/3110.71.9.18 – 10.71.9.1910.71.9.19
1110.71.9.20/3110.71.9.20 – 10.71.9.2110.71.9.21
1210.71.9.22/3110.71.9.22 – 10.71.9.2310.71.9.23
1310.71.9.24/3110.71.9.24 – 10.71.9.2510.71.9.25
1410.71.9.26/3110.71.9.26 – 10.71.9.2710.71.9.27
1510.71.9.28/3110.71.9.28 – 10.71.9.2910.71.9.29
1610.71.9.30/3110.71.9.30 – 10.71.9.3110.71.9.31
1710.71.9.32/3110.71.9.32 – 10.71.9.3310.71.9.33
1810.71.9.34/3110.71.9.34 – 10.71.9.3510.71.9.35
1910.71.9.36/3110.71.9.36 – 10.71.9.3710.71.9.37
2010.71.9.38/3110.71.9.38 – 10.71.9.3910.71.9.39
2110.71.9.40/3110.71.9.40 – 10.71.9.4110.71.9.41
2210.71.9.42/3110.71.9.42 – 10.71.9.4310.71.9.43
2310.71.9.44/3110.71.9.44 – 10.71.9.4510.71.9.45
2410.71.9.46/3110.71.9.46 – 10.71.9.4710.71.9.47
2510.71.9.48/3110.71.9.48 – 10.71.9.4910.71.9.49
2610.71.9.50/3110.71.9.50 – 10.71.9.5110.71.9.51
2710.71.9.52/3110.71.9.52 – 10.71.9.5310.71.9.53
2810.71.9.54/3110.71.9.54 – 10.71.9.5510.71.9.55
2910.71.9.56/3110.71.9.56 – 10.71.9.5710.71.9.57
3010.71.9.58/3110.71.9.58 – 10.71.9.5910.71.9.59
3110.71.9.60/3110.71.9.60 – 10.71.9.6110.71.9.61
3210.71.9.62/3110.71.9.62 – 10.71.9.6310.71.9.63
3310.71.9.64/3110.71.9.64 – 10.71.9.6510.71.9.65
3410.71.9.66/3110.71.9.66 – 10.71.9.6710.71.9.67
3510.71.9.68/3110.71.9.68 – 10.71.9.6910.71.9.69
3610.71.9.70/3110.71.9.70 – 10.71.9.7110.71.9.71
3710.71.9.72/3110.71.9.72 – 10.71.9.7310.71.9.73
3810.71.9.74/3110.71.9.74 – 10.71.9.7510.71.9.75
3910.71.9.76/3110.71.9.76 – 10.71.9.7710.71.9.77
4010.71.9.78/3110.71.9.78 – 10.71.9.7910.71.9.79
4110.71.9.80/3110.71.9.80 – 10.71.9.8110.71.9.81
4210.71.9.82/3110.71.9.82 – 10.71.9.8310.71.9.83
4310.71.9.84/3110.71.9.84 – 10.71.9.8510.71.9.85
4410.71.9.86/3110.71.9.86 – 10.71.9.8710.71.9.87
4510.71.9.88/3110.71.9.88 – 10.71.9.8910.71.9.89
4610.71.9.90/3110.71.9.90 – 10.71.9.9110.71.9.91
4710.71.9.92/3110.71.9.92 – 10.71.9.9310.71.9.93
4810.71.9.94/3110.71.9.94 – 10.71.9.9510.71.9.95
4910.71.9.96/3110.71.9.96 – 10.71.9.9710.71.9.97
5010.71.9.98/3110.71.9.98 – 10.71.9.9910.71.9.99
5110.71.9.100/3110.71.9.100 – 10.71.9.10110.71.9.101
5210.71.9.102/3110.71.9.102 – 10.71.9.10310.71.9.103
5310.71.9.104/3110.71.9.104 – 10.71.9.10510.71.9.105
5410.71.9.106/3110.71.9.106 – 10.71.9.10710.71.9.107
5510.71.9.108/3110.71.9.108 – 10.71.9.10910.71.9.109
5610.71.9.110/3110.71.9.110 – 10.71.9.11110.71.9.111
5710.71.9.112/3110.71.9.112 – 10.71.9.11310.71.9.113
5810.71.9.114/3110.71.9.114 – 10.71.9.11510.71.9.115
5910.71.9.116/3110.71.9.116 – 10.71.9.11710.71.9.117
6010.71.9.118/3110.71.9.118 – 10.71.9.11910.71.9.119
6110.71.9.120/3110.71.9.120 – 10.71.9.12110.71.9.121
6210.71.9.122/3110.71.9.122 – 10.71.9.12310.71.9.123
6310.71.9.124/3110.71.9.124 – 10.71.9.12510.71.9.125
6410.71.9.126/3110.71.9.126 – 10.71.9.12710.71.9.127
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 →