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
private IP (RFC 1918)10.5.187.0/25
network10.5.187.0/25
broadcast10.5.187.127
first host10.5.187.1
last host10.5.187.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.5.187.0/25
address00001010.00000101.10111011.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000101.10111011.00000000
broadcast00001010.00000101.10111011.01111111
green = network part, grey = host part
hex0x0a05bb00
decimal168147712
reverse dns0.187.5.10.in-addr.arpa
ipv4-mapped::ffff:a05:bb00

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.5.187.0/3210.5.187.0 – 10.5.187.010.5.187.0
210.5.187.1/3210.5.187.1 – 10.5.187.110.5.187.1
310.5.187.2/3210.5.187.2 – 10.5.187.210.5.187.2
410.5.187.3/3210.5.187.3 – 10.5.187.310.5.187.3
510.5.187.4/3210.5.187.4 – 10.5.187.410.5.187.4
610.5.187.5/3210.5.187.5 – 10.5.187.510.5.187.5
710.5.187.6/3210.5.187.6 – 10.5.187.610.5.187.6
810.5.187.7/3210.5.187.7 – 10.5.187.710.5.187.7
910.5.187.8/3210.5.187.8 – 10.5.187.810.5.187.8
1010.5.187.9/3210.5.187.9 – 10.5.187.910.5.187.9
1110.5.187.10/3210.5.187.10 – 10.5.187.1010.5.187.10
1210.5.187.11/3210.5.187.11 – 10.5.187.1110.5.187.11
1310.5.187.12/3210.5.187.12 – 10.5.187.1210.5.187.12
1410.5.187.13/3210.5.187.13 – 10.5.187.1310.5.187.13
1510.5.187.14/3210.5.187.14 – 10.5.187.1410.5.187.14
1610.5.187.15/3210.5.187.15 – 10.5.187.1510.5.187.15
1710.5.187.16/3210.5.187.16 – 10.5.187.1610.5.187.16
1810.5.187.17/3210.5.187.17 – 10.5.187.1710.5.187.17
1910.5.187.18/3210.5.187.18 – 10.5.187.1810.5.187.18
2010.5.187.19/3210.5.187.19 – 10.5.187.1910.5.187.19
2110.5.187.20/3210.5.187.20 – 10.5.187.2010.5.187.20
2210.5.187.21/3210.5.187.21 – 10.5.187.2110.5.187.21
2310.5.187.22/3210.5.187.22 – 10.5.187.2210.5.187.22
2410.5.187.23/3210.5.187.23 – 10.5.187.2310.5.187.23
2510.5.187.24/3210.5.187.24 – 10.5.187.2410.5.187.24
2610.5.187.25/3210.5.187.25 – 10.5.187.2510.5.187.25
2710.5.187.26/3210.5.187.26 – 10.5.187.2610.5.187.26
2810.5.187.27/3210.5.187.27 – 10.5.187.2710.5.187.27
2910.5.187.28/3210.5.187.28 – 10.5.187.2810.5.187.28
3010.5.187.29/3210.5.187.29 – 10.5.187.2910.5.187.29
3110.5.187.30/3210.5.187.30 – 10.5.187.3010.5.187.30
3210.5.187.31/3210.5.187.31 – 10.5.187.3110.5.187.31
3310.5.187.32/3210.5.187.32 – 10.5.187.3210.5.187.32
3410.5.187.33/3210.5.187.33 – 10.5.187.3310.5.187.33
3510.5.187.34/3210.5.187.34 – 10.5.187.3410.5.187.34
3610.5.187.35/3210.5.187.35 – 10.5.187.3510.5.187.35
3710.5.187.36/3210.5.187.36 – 10.5.187.3610.5.187.36
3810.5.187.37/3210.5.187.37 – 10.5.187.3710.5.187.37
3910.5.187.38/3210.5.187.38 – 10.5.187.3810.5.187.38
4010.5.187.39/3210.5.187.39 – 10.5.187.3910.5.187.39
4110.5.187.40/3210.5.187.40 – 10.5.187.4010.5.187.40
4210.5.187.41/3210.5.187.41 – 10.5.187.4110.5.187.41
4310.5.187.42/3210.5.187.42 – 10.5.187.4210.5.187.42
4410.5.187.43/3210.5.187.43 – 10.5.187.4310.5.187.43
4510.5.187.44/3210.5.187.44 – 10.5.187.4410.5.187.44
4610.5.187.45/3210.5.187.45 – 10.5.187.4510.5.187.45
4710.5.187.46/3210.5.187.46 – 10.5.187.4610.5.187.46
4810.5.187.47/3210.5.187.47 – 10.5.187.4710.5.187.47
4910.5.187.48/3210.5.187.48 – 10.5.187.4810.5.187.48
5010.5.187.49/3210.5.187.49 – 10.5.187.4910.5.187.49
5110.5.187.50/3210.5.187.50 – 10.5.187.5010.5.187.50
5210.5.187.51/3210.5.187.51 – 10.5.187.5110.5.187.51
5310.5.187.52/3210.5.187.52 – 10.5.187.5210.5.187.52
5410.5.187.53/3210.5.187.53 – 10.5.187.5310.5.187.53
5510.5.187.54/3210.5.187.54 – 10.5.187.5410.5.187.54
5610.5.187.55/3210.5.187.55 – 10.5.187.5510.5.187.55
5710.5.187.56/3210.5.187.56 – 10.5.187.5610.5.187.56
5810.5.187.57/3210.5.187.57 – 10.5.187.5710.5.187.57
5910.5.187.58/3210.5.187.58 – 10.5.187.5810.5.187.58
6010.5.187.59/3210.5.187.59 – 10.5.187.5910.5.187.59
6110.5.187.60/3210.5.187.60 – 10.5.187.6010.5.187.60
6210.5.187.61/3210.5.187.61 – 10.5.187.6110.5.187.61
6310.5.187.62/3210.5.187.62 – 10.5.187.6210.5.187.62
6410.5.187.63/3210.5.187.63 – 10.5.187.6310.5.187.63
6510.5.187.64/3210.5.187.64 – 10.5.187.6410.5.187.64
6610.5.187.65/3210.5.187.65 – 10.5.187.6510.5.187.65
6710.5.187.66/3210.5.187.66 – 10.5.187.6610.5.187.66
6810.5.187.67/3210.5.187.67 – 10.5.187.6710.5.187.67
6910.5.187.68/3210.5.187.68 – 10.5.187.6810.5.187.68
7010.5.187.69/3210.5.187.69 – 10.5.187.6910.5.187.69
7110.5.187.70/3210.5.187.70 – 10.5.187.7010.5.187.70
7210.5.187.71/3210.5.187.71 – 10.5.187.7110.5.187.71
7310.5.187.72/3210.5.187.72 – 10.5.187.7210.5.187.72
7410.5.187.73/3210.5.187.73 – 10.5.187.7310.5.187.73
7510.5.187.74/3210.5.187.74 – 10.5.187.7410.5.187.74
7610.5.187.75/3210.5.187.75 – 10.5.187.7510.5.187.75
7710.5.187.76/3210.5.187.76 – 10.5.187.7610.5.187.76
7810.5.187.77/3210.5.187.77 – 10.5.187.7710.5.187.77
7910.5.187.78/3210.5.187.78 – 10.5.187.7810.5.187.78
8010.5.187.79/3210.5.187.79 – 10.5.187.7910.5.187.79
8110.5.187.80/3210.5.187.80 – 10.5.187.8010.5.187.80
8210.5.187.81/3210.5.187.81 – 10.5.187.8110.5.187.81
8310.5.187.82/3210.5.187.82 – 10.5.187.8210.5.187.82
8410.5.187.83/3210.5.187.83 – 10.5.187.8310.5.187.83
8510.5.187.84/3210.5.187.84 – 10.5.187.8410.5.187.84
8610.5.187.85/3210.5.187.85 – 10.5.187.8510.5.187.85
8710.5.187.86/3210.5.187.86 – 10.5.187.8610.5.187.86
8810.5.187.87/3210.5.187.87 – 10.5.187.8710.5.187.87
8910.5.187.88/3210.5.187.88 – 10.5.187.8810.5.187.88
9010.5.187.89/3210.5.187.89 – 10.5.187.8910.5.187.89
9110.5.187.90/3210.5.187.90 – 10.5.187.9010.5.187.90
9210.5.187.91/3210.5.187.91 – 10.5.187.9110.5.187.91
9310.5.187.92/3210.5.187.92 – 10.5.187.9210.5.187.92
9410.5.187.93/3210.5.187.93 – 10.5.187.9310.5.187.93
9510.5.187.94/3210.5.187.94 – 10.5.187.9410.5.187.94
9610.5.187.95/3210.5.187.95 – 10.5.187.9510.5.187.95
9710.5.187.96/3210.5.187.96 – 10.5.187.9610.5.187.96
9810.5.187.97/3210.5.187.97 – 10.5.187.9710.5.187.97
9910.5.187.98/3210.5.187.98 – 10.5.187.9810.5.187.98
10010.5.187.99/3210.5.187.99 – 10.5.187.9910.5.187.99
10110.5.187.100/3210.5.187.100 – 10.5.187.10010.5.187.100
10210.5.187.101/3210.5.187.101 – 10.5.187.10110.5.187.101
10310.5.187.102/3210.5.187.102 – 10.5.187.10210.5.187.102
10410.5.187.103/3210.5.187.103 – 10.5.187.10310.5.187.103
10510.5.187.104/3210.5.187.104 – 10.5.187.10410.5.187.104
10610.5.187.105/3210.5.187.105 – 10.5.187.10510.5.187.105
10710.5.187.106/3210.5.187.106 – 10.5.187.10610.5.187.106
10810.5.187.107/3210.5.187.107 – 10.5.187.10710.5.187.107
10910.5.187.108/3210.5.187.108 – 10.5.187.10810.5.187.108
11010.5.187.109/3210.5.187.109 – 10.5.187.10910.5.187.109
11110.5.187.110/3210.5.187.110 – 10.5.187.11010.5.187.110
11210.5.187.111/3210.5.187.111 – 10.5.187.11110.5.187.111
11310.5.187.112/3210.5.187.112 – 10.5.187.11210.5.187.112
11410.5.187.113/3210.5.187.113 – 10.5.187.11310.5.187.113
11510.5.187.114/3210.5.187.114 – 10.5.187.11410.5.187.114
11610.5.187.115/3210.5.187.115 – 10.5.187.11510.5.187.115
11710.5.187.116/3210.5.187.116 – 10.5.187.11610.5.187.116
11810.5.187.117/3210.5.187.117 – 10.5.187.11710.5.187.117
11910.5.187.118/3210.5.187.118 – 10.5.187.11810.5.187.118
12010.5.187.119/3210.5.187.119 – 10.5.187.11910.5.187.119
12110.5.187.120/3210.5.187.120 – 10.5.187.12010.5.187.120
12210.5.187.121/3210.5.187.121 – 10.5.187.12110.5.187.121
12310.5.187.122/3210.5.187.122 – 10.5.187.12210.5.187.122
12410.5.187.123/3210.5.187.123 – 10.5.187.12310.5.187.123
12510.5.187.124/3210.5.187.124 – 10.5.187.12410.5.187.124
12610.5.187.125/3210.5.187.125 – 10.5.187.12510.5.187.125
12710.5.187.126/3210.5.187.126 – 10.5.187.12610.5.187.126
12810.5.187.127/3210.5.187.127 – 10.5.187.12710.5.187.127
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 →