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)10.3.207.0/25
network10.3.207.0/25
broadcast10.3.207.127
first host10.3.207.1
last host10.3.207.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.3.207.0/25
address00001010.00000011.11001111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000011.11001111.00000000
broadcast00001010.00000011.11001111.01111111
green = network part, grey = host part
hex0x0a03cf00
decimal168021760
reverse dns0.207.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:cf00

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.207.0/3210.3.207.0 – 10.3.207.010.3.207.0
210.3.207.1/3210.3.207.1 – 10.3.207.110.3.207.1
310.3.207.2/3210.3.207.2 – 10.3.207.210.3.207.2
410.3.207.3/3210.3.207.3 – 10.3.207.310.3.207.3
510.3.207.4/3210.3.207.4 – 10.3.207.410.3.207.4
610.3.207.5/3210.3.207.5 – 10.3.207.510.3.207.5
710.3.207.6/3210.3.207.6 – 10.3.207.610.3.207.6
810.3.207.7/3210.3.207.7 – 10.3.207.710.3.207.7
910.3.207.8/3210.3.207.8 – 10.3.207.810.3.207.8
1010.3.207.9/3210.3.207.9 – 10.3.207.910.3.207.9
1110.3.207.10/3210.3.207.10 – 10.3.207.1010.3.207.10
1210.3.207.11/3210.3.207.11 – 10.3.207.1110.3.207.11
1310.3.207.12/3210.3.207.12 – 10.3.207.1210.3.207.12
1410.3.207.13/3210.3.207.13 – 10.3.207.1310.3.207.13
1510.3.207.14/3210.3.207.14 – 10.3.207.1410.3.207.14
1610.3.207.15/3210.3.207.15 – 10.3.207.1510.3.207.15
1710.3.207.16/3210.3.207.16 – 10.3.207.1610.3.207.16
1810.3.207.17/3210.3.207.17 – 10.3.207.1710.3.207.17
1910.3.207.18/3210.3.207.18 – 10.3.207.1810.3.207.18
2010.3.207.19/3210.3.207.19 – 10.3.207.1910.3.207.19
2110.3.207.20/3210.3.207.20 – 10.3.207.2010.3.207.20
2210.3.207.21/3210.3.207.21 – 10.3.207.2110.3.207.21
2310.3.207.22/3210.3.207.22 – 10.3.207.2210.3.207.22
2410.3.207.23/3210.3.207.23 – 10.3.207.2310.3.207.23
2510.3.207.24/3210.3.207.24 – 10.3.207.2410.3.207.24
2610.3.207.25/3210.3.207.25 – 10.3.207.2510.3.207.25
2710.3.207.26/3210.3.207.26 – 10.3.207.2610.3.207.26
2810.3.207.27/3210.3.207.27 – 10.3.207.2710.3.207.27
2910.3.207.28/3210.3.207.28 – 10.3.207.2810.3.207.28
3010.3.207.29/3210.3.207.29 – 10.3.207.2910.3.207.29
3110.3.207.30/3210.3.207.30 – 10.3.207.3010.3.207.30
3210.3.207.31/3210.3.207.31 – 10.3.207.3110.3.207.31
3310.3.207.32/3210.3.207.32 – 10.3.207.3210.3.207.32
3410.3.207.33/3210.3.207.33 – 10.3.207.3310.3.207.33
3510.3.207.34/3210.3.207.34 – 10.3.207.3410.3.207.34
3610.3.207.35/3210.3.207.35 – 10.3.207.3510.3.207.35
3710.3.207.36/3210.3.207.36 – 10.3.207.3610.3.207.36
3810.3.207.37/3210.3.207.37 – 10.3.207.3710.3.207.37
3910.3.207.38/3210.3.207.38 – 10.3.207.3810.3.207.38
4010.3.207.39/3210.3.207.39 – 10.3.207.3910.3.207.39
4110.3.207.40/3210.3.207.40 – 10.3.207.4010.3.207.40
4210.3.207.41/3210.3.207.41 – 10.3.207.4110.3.207.41
4310.3.207.42/3210.3.207.42 – 10.3.207.4210.3.207.42
4410.3.207.43/3210.3.207.43 – 10.3.207.4310.3.207.43
4510.3.207.44/3210.3.207.44 – 10.3.207.4410.3.207.44
4610.3.207.45/3210.3.207.45 – 10.3.207.4510.3.207.45
4710.3.207.46/3210.3.207.46 – 10.3.207.4610.3.207.46
4810.3.207.47/3210.3.207.47 – 10.3.207.4710.3.207.47
4910.3.207.48/3210.3.207.48 – 10.3.207.4810.3.207.48
5010.3.207.49/3210.3.207.49 – 10.3.207.4910.3.207.49
5110.3.207.50/3210.3.207.50 – 10.3.207.5010.3.207.50
5210.3.207.51/3210.3.207.51 – 10.3.207.5110.3.207.51
5310.3.207.52/3210.3.207.52 – 10.3.207.5210.3.207.52
5410.3.207.53/3210.3.207.53 – 10.3.207.5310.3.207.53
5510.3.207.54/3210.3.207.54 – 10.3.207.5410.3.207.54
5610.3.207.55/3210.3.207.55 – 10.3.207.5510.3.207.55
5710.3.207.56/3210.3.207.56 – 10.3.207.5610.3.207.56
5810.3.207.57/3210.3.207.57 – 10.3.207.5710.3.207.57
5910.3.207.58/3210.3.207.58 – 10.3.207.5810.3.207.58
6010.3.207.59/3210.3.207.59 – 10.3.207.5910.3.207.59
6110.3.207.60/3210.3.207.60 – 10.3.207.6010.3.207.60
6210.3.207.61/3210.3.207.61 – 10.3.207.6110.3.207.61
6310.3.207.62/3210.3.207.62 – 10.3.207.6210.3.207.62
6410.3.207.63/3210.3.207.63 – 10.3.207.6310.3.207.63
6510.3.207.64/3210.3.207.64 – 10.3.207.6410.3.207.64
6610.3.207.65/3210.3.207.65 – 10.3.207.6510.3.207.65
6710.3.207.66/3210.3.207.66 – 10.3.207.6610.3.207.66
6810.3.207.67/3210.3.207.67 – 10.3.207.6710.3.207.67
6910.3.207.68/3210.3.207.68 – 10.3.207.6810.3.207.68
7010.3.207.69/3210.3.207.69 – 10.3.207.6910.3.207.69
7110.3.207.70/3210.3.207.70 – 10.3.207.7010.3.207.70
7210.3.207.71/3210.3.207.71 – 10.3.207.7110.3.207.71
7310.3.207.72/3210.3.207.72 – 10.3.207.7210.3.207.72
7410.3.207.73/3210.3.207.73 – 10.3.207.7310.3.207.73
7510.3.207.74/3210.3.207.74 – 10.3.207.7410.3.207.74
7610.3.207.75/3210.3.207.75 – 10.3.207.7510.3.207.75
7710.3.207.76/3210.3.207.76 – 10.3.207.7610.3.207.76
7810.3.207.77/3210.3.207.77 – 10.3.207.7710.3.207.77
7910.3.207.78/3210.3.207.78 – 10.3.207.7810.3.207.78
8010.3.207.79/3210.3.207.79 – 10.3.207.7910.3.207.79
8110.3.207.80/3210.3.207.80 – 10.3.207.8010.3.207.80
8210.3.207.81/3210.3.207.81 – 10.3.207.8110.3.207.81
8310.3.207.82/3210.3.207.82 – 10.3.207.8210.3.207.82
8410.3.207.83/3210.3.207.83 – 10.3.207.8310.3.207.83
8510.3.207.84/3210.3.207.84 – 10.3.207.8410.3.207.84
8610.3.207.85/3210.3.207.85 – 10.3.207.8510.3.207.85
8710.3.207.86/3210.3.207.86 – 10.3.207.8610.3.207.86
8810.3.207.87/3210.3.207.87 – 10.3.207.8710.3.207.87
8910.3.207.88/3210.3.207.88 – 10.3.207.8810.3.207.88
9010.3.207.89/3210.3.207.89 – 10.3.207.8910.3.207.89
9110.3.207.90/3210.3.207.90 – 10.3.207.9010.3.207.90
9210.3.207.91/3210.3.207.91 – 10.3.207.9110.3.207.91
9310.3.207.92/3210.3.207.92 – 10.3.207.9210.3.207.92
9410.3.207.93/3210.3.207.93 – 10.3.207.9310.3.207.93
9510.3.207.94/3210.3.207.94 – 10.3.207.9410.3.207.94
9610.3.207.95/3210.3.207.95 – 10.3.207.9510.3.207.95
9710.3.207.96/3210.3.207.96 – 10.3.207.9610.3.207.96
9810.3.207.97/3210.3.207.97 – 10.3.207.9710.3.207.97
9910.3.207.98/3210.3.207.98 – 10.3.207.9810.3.207.98
10010.3.207.99/3210.3.207.99 – 10.3.207.9910.3.207.99
10110.3.207.100/3210.3.207.100 – 10.3.207.10010.3.207.100
10210.3.207.101/3210.3.207.101 – 10.3.207.10110.3.207.101
10310.3.207.102/3210.3.207.102 – 10.3.207.10210.3.207.102
10410.3.207.103/3210.3.207.103 – 10.3.207.10310.3.207.103
10510.3.207.104/3210.3.207.104 – 10.3.207.10410.3.207.104
10610.3.207.105/3210.3.207.105 – 10.3.207.10510.3.207.105
10710.3.207.106/3210.3.207.106 – 10.3.207.10610.3.207.106
10810.3.207.107/3210.3.207.107 – 10.3.207.10710.3.207.107
10910.3.207.108/3210.3.207.108 – 10.3.207.10810.3.207.108
11010.3.207.109/3210.3.207.109 – 10.3.207.10910.3.207.109
11110.3.207.110/3210.3.207.110 – 10.3.207.11010.3.207.110
11210.3.207.111/3210.3.207.111 – 10.3.207.11110.3.207.111
11310.3.207.112/3210.3.207.112 – 10.3.207.11210.3.207.112
11410.3.207.113/3210.3.207.113 – 10.3.207.11310.3.207.113
11510.3.207.114/3210.3.207.114 – 10.3.207.11410.3.207.114
11610.3.207.115/3210.3.207.115 – 10.3.207.11510.3.207.115
11710.3.207.116/3210.3.207.116 – 10.3.207.11610.3.207.116
11810.3.207.117/3210.3.207.117 – 10.3.207.11710.3.207.117
11910.3.207.118/3210.3.207.118 – 10.3.207.11810.3.207.118
12010.3.207.119/3210.3.207.119 – 10.3.207.11910.3.207.119
12110.3.207.120/3210.3.207.120 – 10.3.207.12010.3.207.120
12210.3.207.121/3210.3.207.121 – 10.3.207.12110.3.207.121
12310.3.207.122/3210.3.207.122 – 10.3.207.12210.3.207.122
12410.3.207.123/3210.3.207.123 – 10.3.207.12310.3.207.123
12510.3.207.124/3210.3.207.124 – 10.3.207.12410.3.207.124
12610.3.207.125/3210.3.207.125 – 10.3.207.12510.3.207.125
12710.3.207.126/3210.3.207.126 – 10.3.207.12610.3.207.126
12810.3.207.127/3210.3.207.127 – 10.3.207.12710.3.207.127
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 →