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)10.2.18.0/25
network10.2.18.0/25
broadcast10.2.18.127
first host10.2.18.1
last host10.2.18.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.18.0/25
address00001010.00000010.00010010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00010010.00000000
broadcast00001010.00000010.00010010.01111111
green = network part, grey = host part
hex0x0a021200
decimal167907840
reverse dns0.18.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1200

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.18.0/3210.2.18.0 – 10.2.18.010.2.18.0
210.2.18.1/3210.2.18.1 – 10.2.18.110.2.18.1
310.2.18.2/3210.2.18.2 – 10.2.18.210.2.18.2
410.2.18.3/3210.2.18.3 – 10.2.18.310.2.18.3
510.2.18.4/3210.2.18.4 – 10.2.18.410.2.18.4
610.2.18.5/3210.2.18.5 – 10.2.18.510.2.18.5
710.2.18.6/3210.2.18.6 – 10.2.18.610.2.18.6
810.2.18.7/3210.2.18.7 – 10.2.18.710.2.18.7
910.2.18.8/3210.2.18.8 – 10.2.18.810.2.18.8
1010.2.18.9/3210.2.18.9 – 10.2.18.910.2.18.9
1110.2.18.10/3210.2.18.10 – 10.2.18.1010.2.18.10
1210.2.18.11/3210.2.18.11 – 10.2.18.1110.2.18.11
1310.2.18.12/3210.2.18.12 – 10.2.18.1210.2.18.12
1410.2.18.13/3210.2.18.13 – 10.2.18.1310.2.18.13
1510.2.18.14/3210.2.18.14 – 10.2.18.1410.2.18.14
1610.2.18.15/3210.2.18.15 – 10.2.18.1510.2.18.15
1710.2.18.16/3210.2.18.16 – 10.2.18.1610.2.18.16
1810.2.18.17/3210.2.18.17 – 10.2.18.1710.2.18.17
1910.2.18.18/3210.2.18.18 – 10.2.18.1810.2.18.18
2010.2.18.19/3210.2.18.19 – 10.2.18.1910.2.18.19
2110.2.18.20/3210.2.18.20 – 10.2.18.2010.2.18.20
2210.2.18.21/3210.2.18.21 – 10.2.18.2110.2.18.21
2310.2.18.22/3210.2.18.22 – 10.2.18.2210.2.18.22
2410.2.18.23/3210.2.18.23 – 10.2.18.2310.2.18.23
2510.2.18.24/3210.2.18.24 – 10.2.18.2410.2.18.24
2610.2.18.25/3210.2.18.25 – 10.2.18.2510.2.18.25
2710.2.18.26/3210.2.18.26 – 10.2.18.2610.2.18.26
2810.2.18.27/3210.2.18.27 – 10.2.18.2710.2.18.27
2910.2.18.28/3210.2.18.28 – 10.2.18.2810.2.18.28
3010.2.18.29/3210.2.18.29 – 10.2.18.2910.2.18.29
3110.2.18.30/3210.2.18.30 – 10.2.18.3010.2.18.30
3210.2.18.31/3210.2.18.31 – 10.2.18.3110.2.18.31
3310.2.18.32/3210.2.18.32 – 10.2.18.3210.2.18.32
3410.2.18.33/3210.2.18.33 – 10.2.18.3310.2.18.33
3510.2.18.34/3210.2.18.34 – 10.2.18.3410.2.18.34
3610.2.18.35/3210.2.18.35 – 10.2.18.3510.2.18.35
3710.2.18.36/3210.2.18.36 – 10.2.18.3610.2.18.36
3810.2.18.37/3210.2.18.37 – 10.2.18.3710.2.18.37
3910.2.18.38/3210.2.18.38 – 10.2.18.3810.2.18.38
4010.2.18.39/3210.2.18.39 – 10.2.18.3910.2.18.39
4110.2.18.40/3210.2.18.40 – 10.2.18.4010.2.18.40
4210.2.18.41/3210.2.18.41 – 10.2.18.4110.2.18.41
4310.2.18.42/3210.2.18.42 – 10.2.18.4210.2.18.42
4410.2.18.43/3210.2.18.43 – 10.2.18.4310.2.18.43
4510.2.18.44/3210.2.18.44 – 10.2.18.4410.2.18.44
4610.2.18.45/3210.2.18.45 – 10.2.18.4510.2.18.45
4710.2.18.46/3210.2.18.46 – 10.2.18.4610.2.18.46
4810.2.18.47/3210.2.18.47 – 10.2.18.4710.2.18.47
4910.2.18.48/3210.2.18.48 – 10.2.18.4810.2.18.48
5010.2.18.49/3210.2.18.49 – 10.2.18.4910.2.18.49
5110.2.18.50/3210.2.18.50 – 10.2.18.5010.2.18.50
5210.2.18.51/3210.2.18.51 – 10.2.18.5110.2.18.51
5310.2.18.52/3210.2.18.52 – 10.2.18.5210.2.18.52
5410.2.18.53/3210.2.18.53 – 10.2.18.5310.2.18.53
5510.2.18.54/3210.2.18.54 – 10.2.18.5410.2.18.54
5610.2.18.55/3210.2.18.55 – 10.2.18.5510.2.18.55
5710.2.18.56/3210.2.18.56 – 10.2.18.5610.2.18.56
5810.2.18.57/3210.2.18.57 – 10.2.18.5710.2.18.57
5910.2.18.58/3210.2.18.58 – 10.2.18.5810.2.18.58
6010.2.18.59/3210.2.18.59 – 10.2.18.5910.2.18.59
6110.2.18.60/3210.2.18.60 – 10.2.18.6010.2.18.60
6210.2.18.61/3210.2.18.61 – 10.2.18.6110.2.18.61
6310.2.18.62/3210.2.18.62 – 10.2.18.6210.2.18.62
6410.2.18.63/3210.2.18.63 – 10.2.18.6310.2.18.63
6510.2.18.64/3210.2.18.64 – 10.2.18.6410.2.18.64
6610.2.18.65/3210.2.18.65 – 10.2.18.6510.2.18.65
6710.2.18.66/3210.2.18.66 – 10.2.18.6610.2.18.66
6810.2.18.67/3210.2.18.67 – 10.2.18.6710.2.18.67
6910.2.18.68/3210.2.18.68 – 10.2.18.6810.2.18.68
7010.2.18.69/3210.2.18.69 – 10.2.18.6910.2.18.69
7110.2.18.70/3210.2.18.70 – 10.2.18.7010.2.18.70
7210.2.18.71/3210.2.18.71 – 10.2.18.7110.2.18.71
7310.2.18.72/3210.2.18.72 – 10.2.18.7210.2.18.72
7410.2.18.73/3210.2.18.73 – 10.2.18.7310.2.18.73
7510.2.18.74/3210.2.18.74 – 10.2.18.7410.2.18.74
7610.2.18.75/3210.2.18.75 – 10.2.18.7510.2.18.75
7710.2.18.76/3210.2.18.76 – 10.2.18.7610.2.18.76
7810.2.18.77/3210.2.18.77 – 10.2.18.7710.2.18.77
7910.2.18.78/3210.2.18.78 – 10.2.18.7810.2.18.78
8010.2.18.79/3210.2.18.79 – 10.2.18.7910.2.18.79
8110.2.18.80/3210.2.18.80 – 10.2.18.8010.2.18.80
8210.2.18.81/3210.2.18.81 – 10.2.18.8110.2.18.81
8310.2.18.82/3210.2.18.82 – 10.2.18.8210.2.18.82
8410.2.18.83/3210.2.18.83 – 10.2.18.8310.2.18.83
8510.2.18.84/3210.2.18.84 – 10.2.18.8410.2.18.84
8610.2.18.85/3210.2.18.85 – 10.2.18.8510.2.18.85
8710.2.18.86/3210.2.18.86 – 10.2.18.8610.2.18.86
8810.2.18.87/3210.2.18.87 – 10.2.18.8710.2.18.87
8910.2.18.88/3210.2.18.88 – 10.2.18.8810.2.18.88
9010.2.18.89/3210.2.18.89 – 10.2.18.8910.2.18.89
9110.2.18.90/3210.2.18.90 – 10.2.18.9010.2.18.90
9210.2.18.91/3210.2.18.91 – 10.2.18.9110.2.18.91
9310.2.18.92/3210.2.18.92 – 10.2.18.9210.2.18.92
9410.2.18.93/3210.2.18.93 – 10.2.18.9310.2.18.93
9510.2.18.94/3210.2.18.94 – 10.2.18.9410.2.18.94
9610.2.18.95/3210.2.18.95 – 10.2.18.9510.2.18.95
9710.2.18.96/3210.2.18.96 – 10.2.18.9610.2.18.96
9810.2.18.97/3210.2.18.97 – 10.2.18.9710.2.18.97
9910.2.18.98/3210.2.18.98 – 10.2.18.9810.2.18.98
10010.2.18.99/3210.2.18.99 – 10.2.18.9910.2.18.99
10110.2.18.100/3210.2.18.100 – 10.2.18.10010.2.18.100
10210.2.18.101/3210.2.18.101 – 10.2.18.10110.2.18.101
10310.2.18.102/3210.2.18.102 – 10.2.18.10210.2.18.102
10410.2.18.103/3210.2.18.103 – 10.2.18.10310.2.18.103
10510.2.18.104/3210.2.18.104 – 10.2.18.10410.2.18.104
10610.2.18.105/3210.2.18.105 – 10.2.18.10510.2.18.105
10710.2.18.106/3210.2.18.106 – 10.2.18.10610.2.18.106
10810.2.18.107/3210.2.18.107 – 10.2.18.10710.2.18.107
10910.2.18.108/3210.2.18.108 – 10.2.18.10810.2.18.108
11010.2.18.109/3210.2.18.109 – 10.2.18.10910.2.18.109
11110.2.18.110/3210.2.18.110 – 10.2.18.11010.2.18.110
11210.2.18.111/3210.2.18.111 – 10.2.18.11110.2.18.111
11310.2.18.112/3210.2.18.112 – 10.2.18.11210.2.18.112
11410.2.18.113/3210.2.18.113 – 10.2.18.11310.2.18.113
11510.2.18.114/3210.2.18.114 – 10.2.18.11410.2.18.114
11610.2.18.115/3210.2.18.115 – 10.2.18.11510.2.18.115
11710.2.18.116/3210.2.18.116 – 10.2.18.11610.2.18.116
11810.2.18.117/3210.2.18.117 – 10.2.18.11710.2.18.117
11910.2.18.118/3210.2.18.118 – 10.2.18.11810.2.18.118
12010.2.18.119/3210.2.18.119 – 10.2.18.11910.2.18.119
12110.2.18.120/3210.2.18.120 – 10.2.18.12010.2.18.120
12210.2.18.121/3210.2.18.121 – 10.2.18.12110.2.18.121
12310.2.18.122/3210.2.18.122 – 10.2.18.12210.2.18.122
12410.2.18.123/3210.2.18.123 – 10.2.18.12310.2.18.123
12510.2.18.124/3210.2.18.124 – 10.2.18.12410.2.18.124
12610.2.18.125/3210.2.18.125 – 10.2.18.12510.2.18.125
12710.2.18.126/3210.2.18.126 – 10.2.18.12610.2.18.126
12810.2.18.127/3210.2.18.127 – 10.2.18.12710.2.18.127
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 →