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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)10.87.45.0/25
network10.87.45.0/25
broadcast10.87.45.127
first host10.87.45.1
last host10.87.45.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.87.45.0/25
address00001010.01010111.00101101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01010111.00101101.00000000
broadcast00001010.01010111.00101101.01111111
green = network part, grey = host part
hex0x0a572d00
decimal173485312
reverse dns0.45.87.10.in-addr.arpa
ipv4-mapped::ffff:a57:2d00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.87.45.0/3110.87.45.0 – 10.87.45.110.87.45.1
210.87.45.2/3110.87.45.2 – 10.87.45.310.87.45.3
310.87.45.4/3110.87.45.4 – 10.87.45.510.87.45.5
410.87.45.6/3110.87.45.6 – 10.87.45.710.87.45.7
510.87.45.8/3110.87.45.8 – 10.87.45.910.87.45.9
610.87.45.10/3110.87.45.10 – 10.87.45.1110.87.45.11
710.87.45.12/3110.87.45.12 – 10.87.45.1310.87.45.13
810.87.45.14/3110.87.45.14 – 10.87.45.1510.87.45.15
910.87.45.16/3110.87.45.16 – 10.87.45.1710.87.45.17
1010.87.45.18/3110.87.45.18 – 10.87.45.1910.87.45.19
1110.87.45.20/3110.87.45.20 – 10.87.45.2110.87.45.21
1210.87.45.22/3110.87.45.22 – 10.87.45.2310.87.45.23
1310.87.45.24/3110.87.45.24 – 10.87.45.2510.87.45.25
1410.87.45.26/3110.87.45.26 – 10.87.45.2710.87.45.27
1510.87.45.28/3110.87.45.28 – 10.87.45.2910.87.45.29
1610.87.45.30/3110.87.45.30 – 10.87.45.3110.87.45.31
1710.87.45.32/3110.87.45.32 – 10.87.45.3310.87.45.33
1810.87.45.34/3110.87.45.34 – 10.87.45.3510.87.45.35
1910.87.45.36/3110.87.45.36 – 10.87.45.3710.87.45.37
2010.87.45.38/3110.87.45.38 – 10.87.45.3910.87.45.39
2110.87.45.40/3110.87.45.40 – 10.87.45.4110.87.45.41
2210.87.45.42/3110.87.45.42 – 10.87.45.4310.87.45.43
2310.87.45.44/3110.87.45.44 – 10.87.45.4510.87.45.45
2410.87.45.46/3110.87.45.46 – 10.87.45.4710.87.45.47
2510.87.45.48/3110.87.45.48 – 10.87.45.4910.87.45.49
2610.87.45.50/3110.87.45.50 – 10.87.45.5110.87.45.51
2710.87.45.52/3110.87.45.52 – 10.87.45.5310.87.45.53
2810.87.45.54/3110.87.45.54 – 10.87.45.5510.87.45.55
2910.87.45.56/3110.87.45.56 – 10.87.45.5710.87.45.57
3010.87.45.58/3110.87.45.58 – 10.87.45.5910.87.45.59
3110.87.45.60/3110.87.45.60 – 10.87.45.6110.87.45.61
3210.87.45.62/3110.87.45.62 – 10.87.45.6310.87.45.63
3310.87.45.64/3110.87.45.64 – 10.87.45.6510.87.45.65
3410.87.45.66/3110.87.45.66 – 10.87.45.6710.87.45.67
3510.87.45.68/3110.87.45.68 – 10.87.45.6910.87.45.69
3610.87.45.70/3110.87.45.70 – 10.87.45.7110.87.45.71
3710.87.45.72/3110.87.45.72 – 10.87.45.7310.87.45.73
3810.87.45.74/3110.87.45.74 – 10.87.45.7510.87.45.75
3910.87.45.76/3110.87.45.76 – 10.87.45.7710.87.45.77
4010.87.45.78/3110.87.45.78 – 10.87.45.7910.87.45.79
4110.87.45.80/3110.87.45.80 – 10.87.45.8110.87.45.81
4210.87.45.82/3110.87.45.82 – 10.87.45.8310.87.45.83
4310.87.45.84/3110.87.45.84 – 10.87.45.8510.87.45.85
4410.87.45.86/3110.87.45.86 – 10.87.45.8710.87.45.87
4510.87.45.88/3110.87.45.88 – 10.87.45.8910.87.45.89
4610.87.45.90/3110.87.45.90 – 10.87.45.9110.87.45.91
4710.87.45.92/3110.87.45.92 – 10.87.45.9310.87.45.93
4810.87.45.94/3110.87.45.94 – 10.87.45.9510.87.45.95
4910.87.45.96/3110.87.45.96 – 10.87.45.9710.87.45.97
5010.87.45.98/3110.87.45.98 – 10.87.45.9910.87.45.99
5110.87.45.100/3110.87.45.100 – 10.87.45.10110.87.45.101
5210.87.45.102/3110.87.45.102 – 10.87.45.10310.87.45.103
5310.87.45.104/3110.87.45.104 – 10.87.45.10510.87.45.105
5410.87.45.106/3110.87.45.106 – 10.87.45.10710.87.45.107
5510.87.45.108/3110.87.45.108 – 10.87.45.10910.87.45.109
5610.87.45.110/3110.87.45.110 – 10.87.45.11110.87.45.111
5710.87.45.112/3110.87.45.112 – 10.87.45.11310.87.45.113
5810.87.45.114/3110.87.45.114 – 10.87.45.11510.87.45.115
5910.87.45.116/3110.87.45.116 – 10.87.45.11710.87.45.117
6010.87.45.118/3110.87.45.118 – 10.87.45.11910.87.45.119
6110.87.45.120/3110.87.45.120 – 10.87.45.12110.87.45.121
6210.87.45.122/3110.87.45.122 – 10.87.45.12310.87.45.123
6310.87.45.124/3110.87.45.124 – 10.87.45.12510.87.45.125
6410.87.45.126/3110.87.45.126 – 10.87.45.12710.87.45.127
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 →