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)10.0.100.0/25
network10.0.100.0/25
broadcast10.0.100.127
first host10.0.100.1
last host10.0.100.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.100.0/25
address00001010.00000000.01100100.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01100100.00000000
broadcast00001010.00000000.01100100.01111111
green = network part, grey = host part
hex0x0a006400
decimal167797760
reverse dns0.100.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:6400

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.100.0/3210.0.100.0 – 10.0.100.010.0.100.0
210.0.100.1/3210.0.100.1 – 10.0.100.110.0.100.1
310.0.100.2/3210.0.100.2 – 10.0.100.210.0.100.2
410.0.100.3/3210.0.100.3 – 10.0.100.310.0.100.3
510.0.100.4/3210.0.100.4 – 10.0.100.410.0.100.4
610.0.100.5/3210.0.100.5 – 10.0.100.510.0.100.5
710.0.100.6/3210.0.100.6 – 10.0.100.610.0.100.6
810.0.100.7/3210.0.100.7 – 10.0.100.710.0.100.7
910.0.100.8/3210.0.100.8 – 10.0.100.810.0.100.8
1010.0.100.9/3210.0.100.9 – 10.0.100.910.0.100.9
1110.0.100.10/3210.0.100.10 – 10.0.100.1010.0.100.10
1210.0.100.11/3210.0.100.11 – 10.0.100.1110.0.100.11
1310.0.100.12/3210.0.100.12 – 10.0.100.1210.0.100.12
1410.0.100.13/3210.0.100.13 – 10.0.100.1310.0.100.13
1510.0.100.14/3210.0.100.14 – 10.0.100.1410.0.100.14
1610.0.100.15/3210.0.100.15 – 10.0.100.1510.0.100.15
1710.0.100.16/3210.0.100.16 – 10.0.100.1610.0.100.16
1810.0.100.17/3210.0.100.17 – 10.0.100.1710.0.100.17
1910.0.100.18/3210.0.100.18 – 10.0.100.1810.0.100.18
2010.0.100.19/3210.0.100.19 – 10.0.100.1910.0.100.19
2110.0.100.20/3210.0.100.20 – 10.0.100.2010.0.100.20
2210.0.100.21/3210.0.100.21 – 10.0.100.2110.0.100.21
2310.0.100.22/3210.0.100.22 – 10.0.100.2210.0.100.22
2410.0.100.23/3210.0.100.23 – 10.0.100.2310.0.100.23
2510.0.100.24/3210.0.100.24 – 10.0.100.2410.0.100.24
2610.0.100.25/3210.0.100.25 – 10.0.100.2510.0.100.25
2710.0.100.26/3210.0.100.26 – 10.0.100.2610.0.100.26
2810.0.100.27/3210.0.100.27 – 10.0.100.2710.0.100.27
2910.0.100.28/3210.0.100.28 – 10.0.100.2810.0.100.28
3010.0.100.29/3210.0.100.29 – 10.0.100.2910.0.100.29
3110.0.100.30/3210.0.100.30 – 10.0.100.3010.0.100.30
3210.0.100.31/3210.0.100.31 – 10.0.100.3110.0.100.31
3310.0.100.32/3210.0.100.32 – 10.0.100.3210.0.100.32
3410.0.100.33/3210.0.100.33 – 10.0.100.3310.0.100.33
3510.0.100.34/3210.0.100.34 – 10.0.100.3410.0.100.34
3610.0.100.35/3210.0.100.35 – 10.0.100.3510.0.100.35
3710.0.100.36/3210.0.100.36 – 10.0.100.3610.0.100.36
3810.0.100.37/3210.0.100.37 – 10.0.100.3710.0.100.37
3910.0.100.38/3210.0.100.38 – 10.0.100.3810.0.100.38
4010.0.100.39/3210.0.100.39 – 10.0.100.3910.0.100.39
4110.0.100.40/3210.0.100.40 – 10.0.100.4010.0.100.40
4210.0.100.41/3210.0.100.41 – 10.0.100.4110.0.100.41
4310.0.100.42/3210.0.100.42 – 10.0.100.4210.0.100.42
4410.0.100.43/3210.0.100.43 – 10.0.100.4310.0.100.43
4510.0.100.44/3210.0.100.44 – 10.0.100.4410.0.100.44
4610.0.100.45/3210.0.100.45 – 10.0.100.4510.0.100.45
4710.0.100.46/3210.0.100.46 – 10.0.100.4610.0.100.46
4810.0.100.47/3210.0.100.47 – 10.0.100.4710.0.100.47
4910.0.100.48/3210.0.100.48 – 10.0.100.4810.0.100.48
5010.0.100.49/3210.0.100.49 – 10.0.100.4910.0.100.49
5110.0.100.50/3210.0.100.50 – 10.0.100.5010.0.100.50
5210.0.100.51/3210.0.100.51 – 10.0.100.5110.0.100.51
5310.0.100.52/3210.0.100.52 – 10.0.100.5210.0.100.52
5410.0.100.53/3210.0.100.53 – 10.0.100.5310.0.100.53
5510.0.100.54/3210.0.100.54 – 10.0.100.5410.0.100.54
5610.0.100.55/3210.0.100.55 – 10.0.100.5510.0.100.55
5710.0.100.56/3210.0.100.56 – 10.0.100.5610.0.100.56
5810.0.100.57/3210.0.100.57 – 10.0.100.5710.0.100.57
5910.0.100.58/3210.0.100.58 – 10.0.100.5810.0.100.58
6010.0.100.59/3210.0.100.59 – 10.0.100.5910.0.100.59
6110.0.100.60/3210.0.100.60 – 10.0.100.6010.0.100.60
6210.0.100.61/3210.0.100.61 – 10.0.100.6110.0.100.61
6310.0.100.62/3210.0.100.62 – 10.0.100.6210.0.100.62
6410.0.100.63/3210.0.100.63 – 10.0.100.6310.0.100.63
6510.0.100.64/3210.0.100.64 – 10.0.100.6410.0.100.64
6610.0.100.65/3210.0.100.65 – 10.0.100.6510.0.100.65
6710.0.100.66/3210.0.100.66 – 10.0.100.6610.0.100.66
6810.0.100.67/3210.0.100.67 – 10.0.100.6710.0.100.67
6910.0.100.68/3210.0.100.68 – 10.0.100.6810.0.100.68
7010.0.100.69/3210.0.100.69 – 10.0.100.6910.0.100.69
7110.0.100.70/3210.0.100.70 – 10.0.100.7010.0.100.70
7210.0.100.71/3210.0.100.71 – 10.0.100.7110.0.100.71
7310.0.100.72/3210.0.100.72 – 10.0.100.7210.0.100.72
7410.0.100.73/3210.0.100.73 – 10.0.100.7310.0.100.73
7510.0.100.74/3210.0.100.74 – 10.0.100.7410.0.100.74
7610.0.100.75/3210.0.100.75 – 10.0.100.7510.0.100.75
7710.0.100.76/3210.0.100.76 – 10.0.100.7610.0.100.76
7810.0.100.77/3210.0.100.77 – 10.0.100.7710.0.100.77
7910.0.100.78/3210.0.100.78 – 10.0.100.7810.0.100.78
8010.0.100.79/3210.0.100.79 – 10.0.100.7910.0.100.79
8110.0.100.80/3210.0.100.80 – 10.0.100.8010.0.100.80
8210.0.100.81/3210.0.100.81 – 10.0.100.8110.0.100.81
8310.0.100.82/3210.0.100.82 – 10.0.100.8210.0.100.82
8410.0.100.83/3210.0.100.83 – 10.0.100.8310.0.100.83
8510.0.100.84/3210.0.100.84 – 10.0.100.8410.0.100.84
8610.0.100.85/3210.0.100.85 – 10.0.100.8510.0.100.85
8710.0.100.86/3210.0.100.86 – 10.0.100.8610.0.100.86
8810.0.100.87/3210.0.100.87 – 10.0.100.8710.0.100.87
8910.0.100.88/3210.0.100.88 – 10.0.100.8810.0.100.88
9010.0.100.89/3210.0.100.89 – 10.0.100.8910.0.100.89
9110.0.100.90/3210.0.100.90 – 10.0.100.9010.0.100.90
9210.0.100.91/3210.0.100.91 – 10.0.100.9110.0.100.91
9310.0.100.92/3210.0.100.92 – 10.0.100.9210.0.100.92
9410.0.100.93/3210.0.100.93 – 10.0.100.9310.0.100.93
9510.0.100.94/3210.0.100.94 – 10.0.100.9410.0.100.94
9610.0.100.95/3210.0.100.95 – 10.0.100.9510.0.100.95
9710.0.100.96/3210.0.100.96 – 10.0.100.9610.0.100.96
9810.0.100.97/3210.0.100.97 – 10.0.100.9710.0.100.97
9910.0.100.98/3210.0.100.98 – 10.0.100.9810.0.100.98
10010.0.100.99/3210.0.100.99 – 10.0.100.9910.0.100.99
10110.0.100.100/3210.0.100.100 – 10.0.100.10010.0.100.100
10210.0.100.101/3210.0.100.101 – 10.0.100.10110.0.100.101
10310.0.100.102/3210.0.100.102 – 10.0.100.10210.0.100.102
10410.0.100.103/3210.0.100.103 – 10.0.100.10310.0.100.103
10510.0.100.104/3210.0.100.104 – 10.0.100.10410.0.100.104
10610.0.100.105/3210.0.100.105 – 10.0.100.10510.0.100.105
10710.0.100.106/3210.0.100.106 – 10.0.100.10610.0.100.106
10810.0.100.107/3210.0.100.107 – 10.0.100.10710.0.100.107
10910.0.100.108/3210.0.100.108 – 10.0.100.10810.0.100.108
11010.0.100.109/3210.0.100.109 – 10.0.100.10910.0.100.109
11110.0.100.110/3210.0.100.110 – 10.0.100.11010.0.100.110
11210.0.100.111/3210.0.100.111 – 10.0.100.11110.0.100.111
11310.0.100.112/3210.0.100.112 – 10.0.100.11210.0.100.112
11410.0.100.113/3210.0.100.113 – 10.0.100.11310.0.100.113
11510.0.100.114/3210.0.100.114 – 10.0.100.11410.0.100.114
11610.0.100.115/3210.0.100.115 – 10.0.100.11510.0.100.115
11710.0.100.116/3210.0.100.116 – 10.0.100.11610.0.100.116
11810.0.100.117/3210.0.100.117 – 10.0.100.11710.0.100.117
11910.0.100.118/3210.0.100.118 – 10.0.100.11810.0.100.118
12010.0.100.119/3210.0.100.119 – 10.0.100.11910.0.100.119
12110.0.100.120/3210.0.100.120 – 10.0.100.12010.0.100.120
12210.0.100.121/3210.0.100.121 – 10.0.100.12110.0.100.121
12310.0.100.122/3210.0.100.122 – 10.0.100.12210.0.100.122
12410.0.100.123/3210.0.100.123 – 10.0.100.12310.0.100.123
12510.0.100.124/3210.0.100.124 – 10.0.100.12410.0.100.124
12610.0.100.125/3210.0.100.125 – 10.0.100.12510.0.100.125
12710.0.100.126/3210.0.100.126 – 10.0.100.12610.0.100.126
12810.0.100.127/3210.0.100.127 – 10.0.100.12710.0.100.127
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 →