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)10.31.2.0/25
network10.31.2.0/25
broadcast10.31.2.127
first host10.31.2.1
last host10.31.2.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.31.2.0/25
address00001010.00011111.00000010.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00011111.00000010.00000000
broadcast00001010.00011111.00000010.01111111
green = network part, grey = host part
hex0x0a1f0200
decimal169804288
reverse dns0.2.31.10.in-addr.arpa
ipv4-mapped::ffff:a1f:200

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.31.2.0/3210.31.2.0 – 10.31.2.010.31.2.0
210.31.2.1/3210.31.2.1 – 10.31.2.110.31.2.1
310.31.2.2/3210.31.2.2 – 10.31.2.210.31.2.2
410.31.2.3/3210.31.2.3 – 10.31.2.310.31.2.3
510.31.2.4/3210.31.2.4 – 10.31.2.410.31.2.4
610.31.2.5/3210.31.2.5 – 10.31.2.510.31.2.5
710.31.2.6/3210.31.2.6 – 10.31.2.610.31.2.6
810.31.2.7/3210.31.2.7 – 10.31.2.710.31.2.7
910.31.2.8/3210.31.2.8 – 10.31.2.810.31.2.8
1010.31.2.9/3210.31.2.9 – 10.31.2.910.31.2.9
1110.31.2.10/3210.31.2.10 – 10.31.2.1010.31.2.10
1210.31.2.11/3210.31.2.11 – 10.31.2.1110.31.2.11
1310.31.2.12/3210.31.2.12 – 10.31.2.1210.31.2.12
1410.31.2.13/3210.31.2.13 – 10.31.2.1310.31.2.13
1510.31.2.14/3210.31.2.14 – 10.31.2.1410.31.2.14
1610.31.2.15/3210.31.2.15 – 10.31.2.1510.31.2.15
1710.31.2.16/3210.31.2.16 – 10.31.2.1610.31.2.16
1810.31.2.17/3210.31.2.17 – 10.31.2.1710.31.2.17
1910.31.2.18/3210.31.2.18 – 10.31.2.1810.31.2.18
2010.31.2.19/3210.31.2.19 – 10.31.2.1910.31.2.19
2110.31.2.20/3210.31.2.20 – 10.31.2.2010.31.2.20
2210.31.2.21/3210.31.2.21 – 10.31.2.2110.31.2.21
2310.31.2.22/3210.31.2.22 – 10.31.2.2210.31.2.22
2410.31.2.23/3210.31.2.23 – 10.31.2.2310.31.2.23
2510.31.2.24/3210.31.2.24 – 10.31.2.2410.31.2.24
2610.31.2.25/3210.31.2.25 – 10.31.2.2510.31.2.25
2710.31.2.26/3210.31.2.26 – 10.31.2.2610.31.2.26
2810.31.2.27/3210.31.2.27 – 10.31.2.2710.31.2.27
2910.31.2.28/3210.31.2.28 – 10.31.2.2810.31.2.28
3010.31.2.29/3210.31.2.29 – 10.31.2.2910.31.2.29
3110.31.2.30/3210.31.2.30 – 10.31.2.3010.31.2.30
3210.31.2.31/3210.31.2.31 – 10.31.2.3110.31.2.31
3310.31.2.32/3210.31.2.32 – 10.31.2.3210.31.2.32
3410.31.2.33/3210.31.2.33 – 10.31.2.3310.31.2.33
3510.31.2.34/3210.31.2.34 – 10.31.2.3410.31.2.34
3610.31.2.35/3210.31.2.35 – 10.31.2.3510.31.2.35
3710.31.2.36/3210.31.2.36 – 10.31.2.3610.31.2.36
3810.31.2.37/3210.31.2.37 – 10.31.2.3710.31.2.37
3910.31.2.38/3210.31.2.38 – 10.31.2.3810.31.2.38
4010.31.2.39/3210.31.2.39 – 10.31.2.3910.31.2.39
4110.31.2.40/3210.31.2.40 – 10.31.2.4010.31.2.40
4210.31.2.41/3210.31.2.41 – 10.31.2.4110.31.2.41
4310.31.2.42/3210.31.2.42 – 10.31.2.4210.31.2.42
4410.31.2.43/3210.31.2.43 – 10.31.2.4310.31.2.43
4510.31.2.44/3210.31.2.44 – 10.31.2.4410.31.2.44
4610.31.2.45/3210.31.2.45 – 10.31.2.4510.31.2.45
4710.31.2.46/3210.31.2.46 – 10.31.2.4610.31.2.46
4810.31.2.47/3210.31.2.47 – 10.31.2.4710.31.2.47
4910.31.2.48/3210.31.2.48 – 10.31.2.4810.31.2.48
5010.31.2.49/3210.31.2.49 – 10.31.2.4910.31.2.49
5110.31.2.50/3210.31.2.50 – 10.31.2.5010.31.2.50
5210.31.2.51/3210.31.2.51 – 10.31.2.5110.31.2.51
5310.31.2.52/3210.31.2.52 – 10.31.2.5210.31.2.52
5410.31.2.53/3210.31.2.53 – 10.31.2.5310.31.2.53
5510.31.2.54/3210.31.2.54 – 10.31.2.5410.31.2.54
5610.31.2.55/3210.31.2.55 – 10.31.2.5510.31.2.55
5710.31.2.56/3210.31.2.56 – 10.31.2.5610.31.2.56
5810.31.2.57/3210.31.2.57 – 10.31.2.5710.31.2.57
5910.31.2.58/3210.31.2.58 – 10.31.2.5810.31.2.58
6010.31.2.59/3210.31.2.59 – 10.31.2.5910.31.2.59
6110.31.2.60/3210.31.2.60 – 10.31.2.6010.31.2.60
6210.31.2.61/3210.31.2.61 – 10.31.2.6110.31.2.61
6310.31.2.62/3210.31.2.62 – 10.31.2.6210.31.2.62
6410.31.2.63/3210.31.2.63 – 10.31.2.6310.31.2.63
6510.31.2.64/3210.31.2.64 – 10.31.2.6410.31.2.64
6610.31.2.65/3210.31.2.65 – 10.31.2.6510.31.2.65
6710.31.2.66/3210.31.2.66 – 10.31.2.6610.31.2.66
6810.31.2.67/3210.31.2.67 – 10.31.2.6710.31.2.67
6910.31.2.68/3210.31.2.68 – 10.31.2.6810.31.2.68
7010.31.2.69/3210.31.2.69 – 10.31.2.6910.31.2.69
7110.31.2.70/3210.31.2.70 – 10.31.2.7010.31.2.70
7210.31.2.71/3210.31.2.71 – 10.31.2.7110.31.2.71
7310.31.2.72/3210.31.2.72 – 10.31.2.7210.31.2.72
7410.31.2.73/3210.31.2.73 – 10.31.2.7310.31.2.73
7510.31.2.74/3210.31.2.74 – 10.31.2.7410.31.2.74
7610.31.2.75/3210.31.2.75 – 10.31.2.7510.31.2.75
7710.31.2.76/3210.31.2.76 – 10.31.2.7610.31.2.76
7810.31.2.77/3210.31.2.77 – 10.31.2.7710.31.2.77
7910.31.2.78/3210.31.2.78 – 10.31.2.7810.31.2.78
8010.31.2.79/3210.31.2.79 – 10.31.2.7910.31.2.79
8110.31.2.80/3210.31.2.80 – 10.31.2.8010.31.2.80
8210.31.2.81/3210.31.2.81 – 10.31.2.8110.31.2.81
8310.31.2.82/3210.31.2.82 – 10.31.2.8210.31.2.82
8410.31.2.83/3210.31.2.83 – 10.31.2.8310.31.2.83
8510.31.2.84/3210.31.2.84 – 10.31.2.8410.31.2.84
8610.31.2.85/3210.31.2.85 – 10.31.2.8510.31.2.85
8710.31.2.86/3210.31.2.86 – 10.31.2.8610.31.2.86
8810.31.2.87/3210.31.2.87 – 10.31.2.8710.31.2.87
8910.31.2.88/3210.31.2.88 – 10.31.2.8810.31.2.88
9010.31.2.89/3210.31.2.89 – 10.31.2.8910.31.2.89
9110.31.2.90/3210.31.2.90 – 10.31.2.9010.31.2.90
9210.31.2.91/3210.31.2.91 – 10.31.2.9110.31.2.91
9310.31.2.92/3210.31.2.92 – 10.31.2.9210.31.2.92
9410.31.2.93/3210.31.2.93 – 10.31.2.9310.31.2.93
9510.31.2.94/3210.31.2.94 – 10.31.2.9410.31.2.94
9610.31.2.95/3210.31.2.95 – 10.31.2.9510.31.2.95
9710.31.2.96/3210.31.2.96 – 10.31.2.9610.31.2.96
9810.31.2.97/3210.31.2.97 – 10.31.2.9710.31.2.97
9910.31.2.98/3210.31.2.98 – 10.31.2.9810.31.2.98
10010.31.2.99/3210.31.2.99 – 10.31.2.9910.31.2.99
10110.31.2.100/3210.31.2.100 – 10.31.2.10010.31.2.100
10210.31.2.101/3210.31.2.101 – 10.31.2.10110.31.2.101
10310.31.2.102/3210.31.2.102 – 10.31.2.10210.31.2.102
10410.31.2.103/3210.31.2.103 – 10.31.2.10310.31.2.103
10510.31.2.104/3210.31.2.104 – 10.31.2.10410.31.2.104
10610.31.2.105/3210.31.2.105 – 10.31.2.10510.31.2.105
10710.31.2.106/3210.31.2.106 – 10.31.2.10610.31.2.106
10810.31.2.107/3210.31.2.107 – 10.31.2.10710.31.2.107
10910.31.2.108/3210.31.2.108 – 10.31.2.10810.31.2.108
11010.31.2.109/3210.31.2.109 – 10.31.2.10910.31.2.109
11110.31.2.110/3210.31.2.110 – 10.31.2.11010.31.2.110
11210.31.2.111/3210.31.2.111 – 10.31.2.11110.31.2.111
11310.31.2.112/3210.31.2.112 – 10.31.2.11210.31.2.112
11410.31.2.113/3210.31.2.113 – 10.31.2.11310.31.2.113
11510.31.2.114/3210.31.2.114 – 10.31.2.11410.31.2.114
11610.31.2.115/3210.31.2.115 – 10.31.2.11510.31.2.115
11710.31.2.116/3210.31.2.116 – 10.31.2.11610.31.2.116
11810.31.2.117/3210.31.2.117 – 10.31.2.11710.31.2.117
11910.31.2.118/3210.31.2.118 – 10.31.2.11810.31.2.118
12010.31.2.119/3210.31.2.119 – 10.31.2.11910.31.2.119
12110.31.2.120/3210.31.2.120 – 10.31.2.12010.31.2.120
12210.31.2.121/3210.31.2.121 – 10.31.2.12110.31.2.121
12310.31.2.122/3210.31.2.122 – 10.31.2.12210.31.2.122
12410.31.2.123/3210.31.2.123 – 10.31.2.12310.31.2.123
12510.31.2.124/3210.31.2.124 – 10.31.2.12410.31.2.124
12610.31.2.125/3210.31.2.125 – 10.31.2.12510.31.2.125
12710.31.2.126/3210.31.2.126 – 10.31.2.12610.31.2.126
12810.31.2.127/3210.31.2.127 – 10.31.2.12710.31.2.127
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 →