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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)10.64.77.0/25
network10.64.77.0/25
broadcast10.64.77.127
first host10.64.77.1
last host10.64.77.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.64.77.0/25
address00001010.01000000.01001101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.01000000.01001101.00000000
broadcast00001010.01000000.01001101.01111111
green = network part, grey = host part
hex0x0a404d00
decimal171986176
reverse dns0.77.64.10.in-addr.arpa
ipv4-mapped::ffff:a40:4d00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.64.77.0/3110.64.77.0 – 10.64.77.110.64.77.1
210.64.77.2/3110.64.77.2 – 10.64.77.310.64.77.3
310.64.77.4/3110.64.77.4 – 10.64.77.510.64.77.5
410.64.77.6/3110.64.77.6 – 10.64.77.710.64.77.7
510.64.77.8/3110.64.77.8 – 10.64.77.910.64.77.9
610.64.77.10/3110.64.77.10 – 10.64.77.1110.64.77.11
710.64.77.12/3110.64.77.12 – 10.64.77.1310.64.77.13
810.64.77.14/3110.64.77.14 – 10.64.77.1510.64.77.15
910.64.77.16/3110.64.77.16 – 10.64.77.1710.64.77.17
1010.64.77.18/3110.64.77.18 – 10.64.77.1910.64.77.19
1110.64.77.20/3110.64.77.20 – 10.64.77.2110.64.77.21
1210.64.77.22/3110.64.77.22 – 10.64.77.2310.64.77.23
1310.64.77.24/3110.64.77.24 – 10.64.77.2510.64.77.25
1410.64.77.26/3110.64.77.26 – 10.64.77.2710.64.77.27
1510.64.77.28/3110.64.77.28 – 10.64.77.2910.64.77.29
1610.64.77.30/3110.64.77.30 – 10.64.77.3110.64.77.31
1710.64.77.32/3110.64.77.32 – 10.64.77.3310.64.77.33
1810.64.77.34/3110.64.77.34 – 10.64.77.3510.64.77.35
1910.64.77.36/3110.64.77.36 – 10.64.77.3710.64.77.37
2010.64.77.38/3110.64.77.38 – 10.64.77.3910.64.77.39
2110.64.77.40/3110.64.77.40 – 10.64.77.4110.64.77.41
2210.64.77.42/3110.64.77.42 – 10.64.77.4310.64.77.43
2310.64.77.44/3110.64.77.44 – 10.64.77.4510.64.77.45
2410.64.77.46/3110.64.77.46 – 10.64.77.4710.64.77.47
2510.64.77.48/3110.64.77.48 – 10.64.77.4910.64.77.49
2610.64.77.50/3110.64.77.50 – 10.64.77.5110.64.77.51
2710.64.77.52/3110.64.77.52 – 10.64.77.5310.64.77.53
2810.64.77.54/3110.64.77.54 – 10.64.77.5510.64.77.55
2910.64.77.56/3110.64.77.56 – 10.64.77.5710.64.77.57
3010.64.77.58/3110.64.77.58 – 10.64.77.5910.64.77.59
3110.64.77.60/3110.64.77.60 – 10.64.77.6110.64.77.61
3210.64.77.62/3110.64.77.62 – 10.64.77.6310.64.77.63
3310.64.77.64/3110.64.77.64 – 10.64.77.6510.64.77.65
3410.64.77.66/3110.64.77.66 – 10.64.77.6710.64.77.67
3510.64.77.68/3110.64.77.68 – 10.64.77.6910.64.77.69
3610.64.77.70/3110.64.77.70 – 10.64.77.7110.64.77.71
3710.64.77.72/3110.64.77.72 – 10.64.77.7310.64.77.73
3810.64.77.74/3110.64.77.74 – 10.64.77.7510.64.77.75
3910.64.77.76/3110.64.77.76 – 10.64.77.7710.64.77.77
4010.64.77.78/3110.64.77.78 – 10.64.77.7910.64.77.79
4110.64.77.80/3110.64.77.80 – 10.64.77.8110.64.77.81
4210.64.77.82/3110.64.77.82 – 10.64.77.8310.64.77.83
4310.64.77.84/3110.64.77.84 – 10.64.77.8510.64.77.85
4410.64.77.86/3110.64.77.86 – 10.64.77.8710.64.77.87
4510.64.77.88/3110.64.77.88 – 10.64.77.8910.64.77.89
4610.64.77.90/3110.64.77.90 – 10.64.77.9110.64.77.91
4710.64.77.92/3110.64.77.92 – 10.64.77.9310.64.77.93
4810.64.77.94/3110.64.77.94 – 10.64.77.9510.64.77.95
4910.64.77.96/3110.64.77.96 – 10.64.77.9710.64.77.97
5010.64.77.98/3110.64.77.98 – 10.64.77.9910.64.77.99
5110.64.77.100/3110.64.77.100 – 10.64.77.10110.64.77.101
5210.64.77.102/3110.64.77.102 – 10.64.77.10310.64.77.103
5310.64.77.104/3110.64.77.104 – 10.64.77.10510.64.77.105
5410.64.77.106/3110.64.77.106 – 10.64.77.10710.64.77.107
5510.64.77.108/3110.64.77.108 – 10.64.77.10910.64.77.109
5610.64.77.110/3110.64.77.110 – 10.64.77.11110.64.77.111
5710.64.77.112/3110.64.77.112 – 10.64.77.11310.64.77.113
5810.64.77.114/3110.64.77.114 – 10.64.77.11510.64.77.115
5910.64.77.116/3110.64.77.116 – 10.64.77.11710.64.77.117
6010.64.77.118/3110.64.77.118 – 10.64.77.11910.64.77.119
6110.64.77.120/3110.64.77.120 – 10.64.77.12110.64.77.121
6210.64.77.122/3110.64.77.122 – 10.64.77.12310.64.77.123
6310.64.77.124/3110.64.77.124 – 10.64.77.12510.64.77.125
6410.64.77.126/3110.64.77.126 – 10.64.77.12710.64.77.127
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 →