ip
ipku.in

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)10.3.252.0/25
network10.3.252.0/25
broadcast10.3.252.127
first host10.3.252.1
last host10.3.252.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.252.0/25
address00001010.00000011.11111100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.11111100.00000000
broadcast00001010.00000011.11111100.01111111
green = network part, grey = host part
hex0x0a03fc00
decimal168033280
reverse dns0.252.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:fc00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.252.0/3110.3.252.0 – 10.3.252.110.3.252.1
210.3.252.2/3110.3.252.2 – 10.3.252.310.3.252.3
310.3.252.4/3110.3.252.4 – 10.3.252.510.3.252.5
410.3.252.6/3110.3.252.6 – 10.3.252.710.3.252.7
510.3.252.8/3110.3.252.8 – 10.3.252.910.3.252.9
610.3.252.10/3110.3.252.10 – 10.3.252.1110.3.252.11
710.3.252.12/3110.3.252.12 – 10.3.252.1310.3.252.13
810.3.252.14/3110.3.252.14 – 10.3.252.1510.3.252.15
910.3.252.16/3110.3.252.16 – 10.3.252.1710.3.252.17
1010.3.252.18/3110.3.252.18 – 10.3.252.1910.3.252.19
1110.3.252.20/3110.3.252.20 – 10.3.252.2110.3.252.21
1210.3.252.22/3110.3.252.22 – 10.3.252.2310.3.252.23
1310.3.252.24/3110.3.252.24 – 10.3.252.2510.3.252.25
1410.3.252.26/3110.3.252.26 – 10.3.252.2710.3.252.27
1510.3.252.28/3110.3.252.28 – 10.3.252.2910.3.252.29
1610.3.252.30/3110.3.252.30 – 10.3.252.3110.3.252.31
1710.3.252.32/3110.3.252.32 – 10.3.252.3310.3.252.33
1810.3.252.34/3110.3.252.34 – 10.3.252.3510.3.252.35
1910.3.252.36/3110.3.252.36 – 10.3.252.3710.3.252.37
2010.3.252.38/3110.3.252.38 – 10.3.252.3910.3.252.39
2110.3.252.40/3110.3.252.40 – 10.3.252.4110.3.252.41
2210.3.252.42/3110.3.252.42 – 10.3.252.4310.3.252.43
2310.3.252.44/3110.3.252.44 – 10.3.252.4510.3.252.45
2410.3.252.46/3110.3.252.46 – 10.3.252.4710.3.252.47
2510.3.252.48/3110.3.252.48 – 10.3.252.4910.3.252.49
2610.3.252.50/3110.3.252.50 – 10.3.252.5110.3.252.51
2710.3.252.52/3110.3.252.52 – 10.3.252.5310.3.252.53
2810.3.252.54/3110.3.252.54 – 10.3.252.5510.3.252.55
2910.3.252.56/3110.3.252.56 – 10.3.252.5710.3.252.57
3010.3.252.58/3110.3.252.58 – 10.3.252.5910.3.252.59
3110.3.252.60/3110.3.252.60 – 10.3.252.6110.3.252.61
3210.3.252.62/3110.3.252.62 – 10.3.252.6310.3.252.63
3310.3.252.64/3110.3.252.64 – 10.3.252.6510.3.252.65
3410.3.252.66/3110.3.252.66 – 10.3.252.6710.3.252.67
3510.3.252.68/3110.3.252.68 – 10.3.252.6910.3.252.69
3610.3.252.70/3110.3.252.70 – 10.3.252.7110.3.252.71
3710.3.252.72/3110.3.252.72 – 10.3.252.7310.3.252.73
3810.3.252.74/3110.3.252.74 – 10.3.252.7510.3.252.75
3910.3.252.76/3110.3.252.76 – 10.3.252.7710.3.252.77
4010.3.252.78/3110.3.252.78 – 10.3.252.7910.3.252.79
4110.3.252.80/3110.3.252.80 – 10.3.252.8110.3.252.81
4210.3.252.82/3110.3.252.82 – 10.3.252.8310.3.252.83
4310.3.252.84/3110.3.252.84 – 10.3.252.8510.3.252.85
4410.3.252.86/3110.3.252.86 – 10.3.252.8710.3.252.87
4510.3.252.88/3110.3.252.88 – 10.3.252.8910.3.252.89
4610.3.252.90/3110.3.252.90 – 10.3.252.9110.3.252.91
4710.3.252.92/3110.3.252.92 – 10.3.252.9310.3.252.93
4810.3.252.94/3110.3.252.94 – 10.3.252.9510.3.252.95
4910.3.252.96/3110.3.252.96 – 10.3.252.9710.3.252.97
5010.3.252.98/3110.3.252.98 – 10.3.252.9910.3.252.99
5110.3.252.100/3110.3.252.100 – 10.3.252.10110.3.252.101
5210.3.252.102/3110.3.252.102 – 10.3.252.10310.3.252.103
5310.3.252.104/3110.3.252.104 – 10.3.252.10510.3.252.105
5410.3.252.106/3110.3.252.106 – 10.3.252.10710.3.252.107
5510.3.252.108/3110.3.252.108 – 10.3.252.10910.3.252.109
5610.3.252.110/3110.3.252.110 – 10.3.252.11110.3.252.111
5710.3.252.112/3110.3.252.112 – 10.3.252.11310.3.252.113
5810.3.252.114/3110.3.252.114 – 10.3.252.11510.3.252.115
5910.3.252.116/3110.3.252.116 – 10.3.252.11710.3.252.117
6010.3.252.118/3110.3.252.118 – 10.3.252.11910.3.252.119
6110.3.252.120/3110.3.252.120 – 10.3.252.12110.3.252.121
6210.3.252.122/3110.3.252.122 – 10.3.252.12310.3.252.123
6310.3.252.124/3110.3.252.124 – 10.3.252.12510.3.252.125
6410.3.252.126/3110.3.252.126 – 10.3.252.12710.3.252.127
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 →