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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)10.4.45.0/25
network10.4.45.0/25
broadcast10.4.45.127
first host10.4.45.1
last host10.4.45.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.4.45.0/25
address00001010.00000100.00101101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000100.00101101.00000000
broadcast00001010.00000100.00101101.01111111
green = network part, grey = host part
hex0x0a042d00
decimal168045824
reverse dns0.45.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:2d00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.45.0/3110.4.45.0 – 10.4.45.110.4.45.1
210.4.45.2/3110.4.45.2 – 10.4.45.310.4.45.3
310.4.45.4/3110.4.45.4 – 10.4.45.510.4.45.5
410.4.45.6/3110.4.45.6 – 10.4.45.710.4.45.7
510.4.45.8/3110.4.45.8 – 10.4.45.910.4.45.9
610.4.45.10/3110.4.45.10 – 10.4.45.1110.4.45.11
710.4.45.12/3110.4.45.12 – 10.4.45.1310.4.45.13
810.4.45.14/3110.4.45.14 – 10.4.45.1510.4.45.15
910.4.45.16/3110.4.45.16 – 10.4.45.1710.4.45.17
1010.4.45.18/3110.4.45.18 – 10.4.45.1910.4.45.19
1110.4.45.20/3110.4.45.20 – 10.4.45.2110.4.45.21
1210.4.45.22/3110.4.45.22 – 10.4.45.2310.4.45.23
1310.4.45.24/3110.4.45.24 – 10.4.45.2510.4.45.25
1410.4.45.26/3110.4.45.26 – 10.4.45.2710.4.45.27
1510.4.45.28/3110.4.45.28 – 10.4.45.2910.4.45.29
1610.4.45.30/3110.4.45.30 – 10.4.45.3110.4.45.31
1710.4.45.32/3110.4.45.32 – 10.4.45.3310.4.45.33
1810.4.45.34/3110.4.45.34 – 10.4.45.3510.4.45.35
1910.4.45.36/3110.4.45.36 – 10.4.45.3710.4.45.37
2010.4.45.38/3110.4.45.38 – 10.4.45.3910.4.45.39
2110.4.45.40/3110.4.45.40 – 10.4.45.4110.4.45.41
2210.4.45.42/3110.4.45.42 – 10.4.45.4310.4.45.43
2310.4.45.44/3110.4.45.44 – 10.4.45.4510.4.45.45
2410.4.45.46/3110.4.45.46 – 10.4.45.4710.4.45.47
2510.4.45.48/3110.4.45.48 – 10.4.45.4910.4.45.49
2610.4.45.50/3110.4.45.50 – 10.4.45.5110.4.45.51
2710.4.45.52/3110.4.45.52 – 10.4.45.5310.4.45.53
2810.4.45.54/3110.4.45.54 – 10.4.45.5510.4.45.55
2910.4.45.56/3110.4.45.56 – 10.4.45.5710.4.45.57
3010.4.45.58/3110.4.45.58 – 10.4.45.5910.4.45.59
3110.4.45.60/3110.4.45.60 – 10.4.45.6110.4.45.61
3210.4.45.62/3110.4.45.62 – 10.4.45.6310.4.45.63
3310.4.45.64/3110.4.45.64 – 10.4.45.6510.4.45.65
3410.4.45.66/3110.4.45.66 – 10.4.45.6710.4.45.67
3510.4.45.68/3110.4.45.68 – 10.4.45.6910.4.45.69
3610.4.45.70/3110.4.45.70 – 10.4.45.7110.4.45.71
3710.4.45.72/3110.4.45.72 – 10.4.45.7310.4.45.73
3810.4.45.74/3110.4.45.74 – 10.4.45.7510.4.45.75
3910.4.45.76/3110.4.45.76 – 10.4.45.7710.4.45.77
4010.4.45.78/3110.4.45.78 – 10.4.45.7910.4.45.79
4110.4.45.80/3110.4.45.80 – 10.4.45.8110.4.45.81
4210.4.45.82/3110.4.45.82 – 10.4.45.8310.4.45.83
4310.4.45.84/3110.4.45.84 – 10.4.45.8510.4.45.85
4410.4.45.86/3110.4.45.86 – 10.4.45.8710.4.45.87
4510.4.45.88/3110.4.45.88 – 10.4.45.8910.4.45.89
4610.4.45.90/3110.4.45.90 – 10.4.45.9110.4.45.91
4710.4.45.92/3110.4.45.92 – 10.4.45.9310.4.45.93
4810.4.45.94/3110.4.45.94 – 10.4.45.9510.4.45.95
4910.4.45.96/3110.4.45.96 – 10.4.45.9710.4.45.97
5010.4.45.98/3110.4.45.98 – 10.4.45.9910.4.45.99
5110.4.45.100/3110.4.45.100 – 10.4.45.10110.4.45.101
5210.4.45.102/3110.4.45.102 – 10.4.45.10310.4.45.103
5310.4.45.104/3110.4.45.104 – 10.4.45.10510.4.45.105
5410.4.45.106/3110.4.45.106 – 10.4.45.10710.4.45.107
5510.4.45.108/3110.4.45.108 – 10.4.45.10910.4.45.109
5610.4.45.110/3110.4.45.110 – 10.4.45.11110.4.45.111
5710.4.45.112/3110.4.45.112 – 10.4.45.11310.4.45.113
5810.4.45.114/3110.4.45.114 – 10.4.45.11510.4.45.115
5910.4.45.116/3110.4.45.116 – 10.4.45.11710.4.45.117
6010.4.45.118/3110.4.45.118 – 10.4.45.11910.4.45.119
6110.4.45.120/3110.4.45.120 – 10.4.45.12110.4.45.121
6210.4.45.122/3110.4.45.122 – 10.4.45.12310.4.45.123
6310.4.45.124/3110.4.45.124 – 10.4.45.12510.4.45.125
6410.4.45.126/3110.4.45.126 – 10.4.45.12710.4.45.127
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 →