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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)10.152.131.0/25
network10.152.131.0/25
broadcast10.152.131.127
first host10.152.131.1
last host10.152.131.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.152.131.0/25
address00001010.10011000.10000011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10011000.10000011.00000000
broadcast00001010.10011000.10000011.01111111
green = network part, grey = host part
hex0x0a988300
decimal177767168
reverse dns0.131.152.10.in-addr.arpa
ipv4-mapped::ffff:a98:8300

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.152.131.0/3110.152.131.0 – 10.152.131.110.152.131.1
210.152.131.2/3110.152.131.2 – 10.152.131.310.152.131.3
310.152.131.4/3110.152.131.4 – 10.152.131.510.152.131.5
410.152.131.6/3110.152.131.6 – 10.152.131.710.152.131.7
510.152.131.8/3110.152.131.8 – 10.152.131.910.152.131.9
610.152.131.10/3110.152.131.10 – 10.152.131.1110.152.131.11
710.152.131.12/3110.152.131.12 – 10.152.131.1310.152.131.13
810.152.131.14/3110.152.131.14 – 10.152.131.1510.152.131.15
910.152.131.16/3110.152.131.16 – 10.152.131.1710.152.131.17
1010.152.131.18/3110.152.131.18 – 10.152.131.1910.152.131.19
1110.152.131.20/3110.152.131.20 – 10.152.131.2110.152.131.21
1210.152.131.22/3110.152.131.22 – 10.152.131.2310.152.131.23
1310.152.131.24/3110.152.131.24 – 10.152.131.2510.152.131.25
1410.152.131.26/3110.152.131.26 – 10.152.131.2710.152.131.27
1510.152.131.28/3110.152.131.28 – 10.152.131.2910.152.131.29
1610.152.131.30/3110.152.131.30 – 10.152.131.3110.152.131.31
1710.152.131.32/3110.152.131.32 – 10.152.131.3310.152.131.33
1810.152.131.34/3110.152.131.34 – 10.152.131.3510.152.131.35
1910.152.131.36/3110.152.131.36 – 10.152.131.3710.152.131.37
2010.152.131.38/3110.152.131.38 – 10.152.131.3910.152.131.39
2110.152.131.40/3110.152.131.40 – 10.152.131.4110.152.131.41
2210.152.131.42/3110.152.131.42 – 10.152.131.4310.152.131.43
2310.152.131.44/3110.152.131.44 – 10.152.131.4510.152.131.45
2410.152.131.46/3110.152.131.46 – 10.152.131.4710.152.131.47
2510.152.131.48/3110.152.131.48 – 10.152.131.4910.152.131.49
2610.152.131.50/3110.152.131.50 – 10.152.131.5110.152.131.51
2710.152.131.52/3110.152.131.52 – 10.152.131.5310.152.131.53
2810.152.131.54/3110.152.131.54 – 10.152.131.5510.152.131.55
2910.152.131.56/3110.152.131.56 – 10.152.131.5710.152.131.57
3010.152.131.58/3110.152.131.58 – 10.152.131.5910.152.131.59
3110.152.131.60/3110.152.131.60 – 10.152.131.6110.152.131.61
3210.152.131.62/3110.152.131.62 – 10.152.131.6310.152.131.63
3310.152.131.64/3110.152.131.64 – 10.152.131.6510.152.131.65
3410.152.131.66/3110.152.131.66 – 10.152.131.6710.152.131.67
3510.152.131.68/3110.152.131.68 – 10.152.131.6910.152.131.69
3610.152.131.70/3110.152.131.70 – 10.152.131.7110.152.131.71
3710.152.131.72/3110.152.131.72 – 10.152.131.7310.152.131.73
3810.152.131.74/3110.152.131.74 – 10.152.131.7510.152.131.75
3910.152.131.76/3110.152.131.76 – 10.152.131.7710.152.131.77
4010.152.131.78/3110.152.131.78 – 10.152.131.7910.152.131.79
4110.152.131.80/3110.152.131.80 – 10.152.131.8110.152.131.81
4210.152.131.82/3110.152.131.82 – 10.152.131.8310.152.131.83
4310.152.131.84/3110.152.131.84 – 10.152.131.8510.152.131.85
4410.152.131.86/3110.152.131.86 – 10.152.131.8710.152.131.87
4510.152.131.88/3110.152.131.88 – 10.152.131.8910.152.131.89
4610.152.131.90/3110.152.131.90 – 10.152.131.9110.152.131.91
4710.152.131.92/3110.152.131.92 – 10.152.131.9310.152.131.93
4810.152.131.94/3110.152.131.94 – 10.152.131.9510.152.131.95
4910.152.131.96/3110.152.131.96 – 10.152.131.9710.152.131.97
5010.152.131.98/3110.152.131.98 – 10.152.131.9910.152.131.99
5110.152.131.100/3110.152.131.100 – 10.152.131.10110.152.131.101
5210.152.131.102/3110.152.131.102 – 10.152.131.10310.152.131.103
5310.152.131.104/3110.152.131.104 – 10.152.131.10510.152.131.105
5410.152.131.106/3110.152.131.106 – 10.152.131.10710.152.131.107
5510.152.131.108/3110.152.131.108 – 10.152.131.10910.152.131.109
5610.152.131.110/3110.152.131.110 – 10.152.131.11110.152.131.111
5710.152.131.112/3110.152.131.112 – 10.152.131.11310.152.131.113
5810.152.131.114/3110.152.131.114 – 10.152.131.11510.152.131.115
5910.152.131.116/3110.152.131.116 – 10.152.131.11710.152.131.117
6010.152.131.118/3110.152.131.118 – 10.152.131.11910.152.131.119
6110.152.131.120/3110.152.131.120 – 10.152.131.12110.152.131.121
6210.152.131.122/3110.152.131.122 – 10.152.131.12310.152.131.123
6310.152.131.124/3110.152.131.124 – 10.152.131.12510.152.131.125
6410.152.131.126/3110.152.131.126 – 10.152.131.12710.152.131.127
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 →