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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)10.2.61.0/25
network10.2.61.0/25
broadcast10.2.61.127
first host10.2.61.1
last host10.2.61.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.61.0/25
address00001010.00000010.00111101.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00111101.00000000
broadcast00001010.00000010.00111101.01111111
green = network part, grey = host part
hex0x0a023d00
decimal167918848
reverse dns0.61.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:3d00

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.61.0/3110.2.61.0 – 10.2.61.110.2.61.1
210.2.61.2/3110.2.61.2 – 10.2.61.310.2.61.3
310.2.61.4/3110.2.61.4 – 10.2.61.510.2.61.5
410.2.61.6/3110.2.61.6 – 10.2.61.710.2.61.7
510.2.61.8/3110.2.61.8 – 10.2.61.910.2.61.9
610.2.61.10/3110.2.61.10 – 10.2.61.1110.2.61.11
710.2.61.12/3110.2.61.12 – 10.2.61.1310.2.61.13
810.2.61.14/3110.2.61.14 – 10.2.61.1510.2.61.15
910.2.61.16/3110.2.61.16 – 10.2.61.1710.2.61.17
1010.2.61.18/3110.2.61.18 – 10.2.61.1910.2.61.19
1110.2.61.20/3110.2.61.20 – 10.2.61.2110.2.61.21
1210.2.61.22/3110.2.61.22 – 10.2.61.2310.2.61.23
1310.2.61.24/3110.2.61.24 – 10.2.61.2510.2.61.25
1410.2.61.26/3110.2.61.26 – 10.2.61.2710.2.61.27
1510.2.61.28/3110.2.61.28 – 10.2.61.2910.2.61.29
1610.2.61.30/3110.2.61.30 – 10.2.61.3110.2.61.31
1710.2.61.32/3110.2.61.32 – 10.2.61.3310.2.61.33
1810.2.61.34/3110.2.61.34 – 10.2.61.3510.2.61.35
1910.2.61.36/3110.2.61.36 – 10.2.61.3710.2.61.37
2010.2.61.38/3110.2.61.38 – 10.2.61.3910.2.61.39
2110.2.61.40/3110.2.61.40 – 10.2.61.4110.2.61.41
2210.2.61.42/3110.2.61.42 – 10.2.61.4310.2.61.43
2310.2.61.44/3110.2.61.44 – 10.2.61.4510.2.61.45
2410.2.61.46/3110.2.61.46 – 10.2.61.4710.2.61.47
2510.2.61.48/3110.2.61.48 – 10.2.61.4910.2.61.49
2610.2.61.50/3110.2.61.50 – 10.2.61.5110.2.61.51
2710.2.61.52/3110.2.61.52 – 10.2.61.5310.2.61.53
2810.2.61.54/3110.2.61.54 – 10.2.61.5510.2.61.55
2910.2.61.56/3110.2.61.56 – 10.2.61.5710.2.61.57
3010.2.61.58/3110.2.61.58 – 10.2.61.5910.2.61.59
3110.2.61.60/3110.2.61.60 – 10.2.61.6110.2.61.61
3210.2.61.62/3110.2.61.62 – 10.2.61.6310.2.61.63
3310.2.61.64/3110.2.61.64 – 10.2.61.6510.2.61.65
3410.2.61.66/3110.2.61.66 – 10.2.61.6710.2.61.67
3510.2.61.68/3110.2.61.68 – 10.2.61.6910.2.61.69
3610.2.61.70/3110.2.61.70 – 10.2.61.7110.2.61.71
3710.2.61.72/3110.2.61.72 – 10.2.61.7310.2.61.73
3810.2.61.74/3110.2.61.74 – 10.2.61.7510.2.61.75
3910.2.61.76/3110.2.61.76 – 10.2.61.7710.2.61.77
4010.2.61.78/3110.2.61.78 – 10.2.61.7910.2.61.79
4110.2.61.80/3110.2.61.80 – 10.2.61.8110.2.61.81
4210.2.61.82/3110.2.61.82 – 10.2.61.8310.2.61.83
4310.2.61.84/3110.2.61.84 – 10.2.61.8510.2.61.85
4410.2.61.86/3110.2.61.86 – 10.2.61.8710.2.61.87
4510.2.61.88/3110.2.61.88 – 10.2.61.8910.2.61.89
4610.2.61.90/3110.2.61.90 – 10.2.61.9110.2.61.91
4710.2.61.92/3110.2.61.92 – 10.2.61.9310.2.61.93
4810.2.61.94/3110.2.61.94 – 10.2.61.9510.2.61.95
4910.2.61.96/3110.2.61.96 – 10.2.61.9710.2.61.97
5010.2.61.98/3110.2.61.98 – 10.2.61.9910.2.61.99
5110.2.61.100/3110.2.61.100 – 10.2.61.10110.2.61.101
5210.2.61.102/3110.2.61.102 – 10.2.61.10310.2.61.103
5310.2.61.104/3110.2.61.104 – 10.2.61.10510.2.61.105
5410.2.61.106/3110.2.61.106 – 10.2.61.10710.2.61.107
5510.2.61.108/3110.2.61.108 – 10.2.61.10910.2.61.109
5610.2.61.110/3110.2.61.110 – 10.2.61.11110.2.61.111
5710.2.61.112/3110.2.61.112 – 10.2.61.11310.2.61.113
5810.2.61.114/3110.2.61.114 – 10.2.61.11510.2.61.115
5910.2.61.116/3110.2.61.116 – 10.2.61.11710.2.61.117
6010.2.61.118/3110.2.61.118 – 10.2.61.11910.2.61.119
6110.2.61.120/3110.2.61.120 – 10.2.61.12110.2.61.121
6210.2.61.122/3110.2.61.122 – 10.2.61.12310.2.61.123
6310.2.61.124/3110.2.61.124 – 10.2.61.12510.2.61.125
6410.2.61.126/3110.2.61.126 – 10.2.61.12710.2.61.127
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 →