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)10.2.31.0/25
network10.2.31.0/25
broadcast10.2.31.127
first host10.2.31.1
last host10.2.31.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.31.0/25
address00001010.00000010.00011111.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00011111.00000000
broadcast00001010.00000010.00011111.01111111
green = network part, grey = host part
hex0x0a021f00
decimal167911168
reverse dns0.31.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1f00

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.31.0/3210.2.31.0 – 10.2.31.010.2.31.0
210.2.31.1/3210.2.31.1 – 10.2.31.110.2.31.1
310.2.31.2/3210.2.31.2 – 10.2.31.210.2.31.2
410.2.31.3/3210.2.31.3 – 10.2.31.310.2.31.3
510.2.31.4/3210.2.31.4 – 10.2.31.410.2.31.4
610.2.31.5/3210.2.31.5 – 10.2.31.510.2.31.5
710.2.31.6/3210.2.31.6 – 10.2.31.610.2.31.6
810.2.31.7/3210.2.31.7 – 10.2.31.710.2.31.7
910.2.31.8/3210.2.31.8 – 10.2.31.810.2.31.8
1010.2.31.9/3210.2.31.9 – 10.2.31.910.2.31.9
1110.2.31.10/3210.2.31.10 – 10.2.31.1010.2.31.10
1210.2.31.11/3210.2.31.11 – 10.2.31.1110.2.31.11
1310.2.31.12/3210.2.31.12 – 10.2.31.1210.2.31.12
1410.2.31.13/3210.2.31.13 – 10.2.31.1310.2.31.13
1510.2.31.14/3210.2.31.14 – 10.2.31.1410.2.31.14
1610.2.31.15/3210.2.31.15 – 10.2.31.1510.2.31.15
1710.2.31.16/3210.2.31.16 – 10.2.31.1610.2.31.16
1810.2.31.17/3210.2.31.17 – 10.2.31.1710.2.31.17
1910.2.31.18/3210.2.31.18 – 10.2.31.1810.2.31.18
2010.2.31.19/3210.2.31.19 – 10.2.31.1910.2.31.19
2110.2.31.20/3210.2.31.20 – 10.2.31.2010.2.31.20
2210.2.31.21/3210.2.31.21 – 10.2.31.2110.2.31.21
2310.2.31.22/3210.2.31.22 – 10.2.31.2210.2.31.22
2410.2.31.23/3210.2.31.23 – 10.2.31.2310.2.31.23
2510.2.31.24/3210.2.31.24 – 10.2.31.2410.2.31.24
2610.2.31.25/3210.2.31.25 – 10.2.31.2510.2.31.25
2710.2.31.26/3210.2.31.26 – 10.2.31.2610.2.31.26
2810.2.31.27/3210.2.31.27 – 10.2.31.2710.2.31.27
2910.2.31.28/3210.2.31.28 – 10.2.31.2810.2.31.28
3010.2.31.29/3210.2.31.29 – 10.2.31.2910.2.31.29
3110.2.31.30/3210.2.31.30 – 10.2.31.3010.2.31.30
3210.2.31.31/3210.2.31.31 – 10.2.31.3110.2.31.31
3310.2.31.32/3210.2.31.32 – 10.2.31.3210.2.31.32
3410.2.31.33/3210.2.31.33 – 10.2.31.3310.2.31.33
3510.2.31.34/3210.2.31.34 – 10.2.31.3410.2.31.34
3610.2.31.35/3210.2.31.35 – 10.2.31.3510.2.31.35
3710.2.31.36/3210.2.31.36 – 10.2.31.3610.2.31.36
3810.2.31.37/3210.2.31.37 – 10.2.31.3710.2.31.37
3910.2.31.38/3210.2.31.38 – 10.2.31.3810.2.31.38
4010.2.31.39/3210.2.31.39 – 10.2.31.3910.2.31.39
4110.2.31.40/3210.2.31.40 – 10.2.31.4010.2.31.40
4210.2.31.41/3210.2.31.41 – 10.2.31.4110.2.31.41
4310.2.31.42/3210.2.31.42 – 10.2.31.4210.2.31.42
4410.2.31.43/3210.2.31.43 – 10.2.31.4310.2.31.43
4510.2.31.44/3210.2.31.44 – 10.2.31.4410.2.31.44
4610.2.31.45/3210.2.31.45 – 10.2.31.4510.2.31.45
4710.2.31.46/3210.2.31.46 – 10.2.31.4610.2.31.46
4810.2.31.47/3210.2.31.47 – 10.2.31.4710.2.31.47
4910.2.31.48/3210.2.31.48 – 10.2.31.4810.2.31.48
5010.2.31.49/3210.2.31.49 – 10.2.31.4910.2.31.49
5110.2.31.50/3210.2.31.50 – 10.2.31.5010.2.31.50
5210.2.31.51/3210.2.31.51 – 10.2.31.5110.2.31.51
5310.2.31.52/3210.2.31.52 – 10.2.31.5210.2.31.52
5410.2.31.53/3210.2.31.53 – 10.2.31.5310.2.31.53
5510.2.31.54/3210.2.31.54 – 10.2.31.5410.2.31.54
5610.2.31.55/3210.2.31.55 – 10.2.31.5510.2.31.55
5710.2.31.56/3210.2.31.56 – 10.2.31.5610.2.31.56
5810.2.31.57/3210.2.31.57 – 10.2.31.5710.2.31.57
5910.2.31.58/3210.2.31.58 – 10.2.31.5810.2.31.58
6010.2.31.59/3210.2.31.59 – 10.2.31.5910.2.31.59
6110.2.31.60/3210.2.31.60 – 10.2.31.6010.2.31.60
6210.2.31.61/3210.2.31.61 – 10.2.31.6110.2.31.61
6310.2.31.62/3210.2.31.62 – 10.2.31.6210.2.31.62
6410.2.31.63/3210.2.31.63 – 10.2.31.6310.2.31.63
6510.2.31.64/3210.2.31.64 – 10.2.31.6410.2.31.64
6610.2.31.65/3210.2.31.65 – 10.2.31.6510.2.31.65
6710.2.31.66/3210.2.31.66 – 10.2.31.6610.2.31.66
6810.2.31.67/3210.2.31.67 – 10.2.31.6710.2.31.67
6910.2.31.68/3210.2.31.68 – 10.2.31.6810.2.31.68
7010.2.31.69/3210.2.31.69 – 10.2.31.6910.2.31.69
7110.2.31.70/3210.2.31.70 – 10.2.31.7010.2.31.70
7210.2.31.71/3210.2.31.71 – 10.2.31.7110.2.31.71
7310.2.31.72/3210.2.31.72 – 10.2.31.7210.2.31.72
7410.2.31.73/3210.2.31.73 – 10.2.31.7310.2.31.73
7510.2.31.74/3210.2.31.74 – 10.2.31.7410.2.31.74
7610.2.31.75/3210.2.31.75 – 10.2.31.7510.2.31.75
7710.2.31.76/3210.2.31.76 – 10.2.31.7610.2.31.76
7810.2.31.77/3210.2.31.77 – 10.2.31.7710.2.31.77
7910.2.31.78/3210.2.31.78 – 10.2.31.7810.2.31.78
8010.2.31.79/3210.2.31.79 – 10.2.31.7910.2.31.79
8110.2.31.80/3210.2.31.80 – 10.2.31.8010.2.31.80
8210.2.31.81/3210.2.31.81 – 10.2.31.8110.2.31.81
8310.2.31.82/3210.2.31.82 – 10.2.31.8210.2.31.82
8410.2.31.83/3210.2.31.83 – 10.2.31.8310.2.31.83
8510.2.31.84/3210.2.31.84 – 10.2.31.8410.2.31.84
8610.2.31.85/3210.2.31.85 – 10.2.31.8510.2.31.85
8710.2.31.86/3210.2.31.86 – 10.2.31.8610.2.31.86
8810.2.31.87/3210.2.31.87 – 10.2.31.8710.2.31.87
8910.2.31.88/3210.2.31.88 – 10.2.31.8810.2.31.88
9010.2.31.89/3210.2.31.89 – 10.2.31.8910.2.31.89
9110.2.31.90/3210.2.31.90 – 10.2.31.9010.2.31.90
9210.2.31.91/3210.2.31.91 – 10.2.31.9110.2.31.91
9310.2.31.92/3210.2.31.92 – 10.2.31.9210.2.31.92
9410.2.31.93/3210.2.31.93 – 10.2.31.9310.2.31.93
9510.2.31.94/3210.2.31.94 – 10.2.31.9410.2.31.94
9610.2.31.95/3210.2.31.95 – 10.2.31.9510.2.31.95
9710.2.31.96/3210.2.31.96 – 10.2.31.9610.2.31.96
9810.2.31.97/3210.2.31.97 – 10.2.31.9710.2.31.97
9910.2.31.98/3210.2.31.98 – 10.2.31.9810.2.31.98
10010.2.31.99/3210.2.31.99 – 10.2.31.9910.2.31.99
10110.2.31.100/3210.2.31.100 – 10.2.31.10010.2.31.100
10210.2.31.101/3210.2.31.101 – 10.2.31.10110.2.31.101
10310.2.31.102/3210.2.31.102 – 10.2.31.10210.2.31.102
10410.2.31.103/3210.2.31.103 – 10.2.31.10310.2.31.103
10510.2.31.104/3210.2.31.104 – 10.2.31.10410.2.31.104
10610.2.31.105/3210.2.31.105 – 10.2.31.10510.2.31.105
10710.2.31.106/3210.2.31.106 – 10.2.31.10610.2.31.106
10810.2.31.107/3210.2.31.107 – 10.2.31.10710.2.31.107
10910.2.31.108/3210.2.31.108 – 10.2.31.10810.2.31.108
11010.2.31.109/3210.2.31.109 – 10.2.31.10910.2.31.109
11110.2.31.110/3210.2.31.110 – 10.2.31.11010.2.31.110
11210.2.31.111/3210.2.31.111 – 10.2.31.11110.2.31.111
11310.2.31.112/3210.2.31.112 – 10.2.31.11210.2.31.112
11410.2.31.113/3210.2.31.113 – 10.2.31.11310.2.31.113
11510.2.31.114/3210.2.31.114 – 10.2.31.11410.2.31.114
11610.2.31.115/3210.2.31.115 – 10.2.31.11510.2.31.115
11710.2.31.116/3210.2.31.116 – 10.2.31.11610.2.31.116
11810.2.31.117/3210.2.31.117 – 10.2.31.11710.2.31.117
11910.2.31.118/3210.2.31.118 – 10.2.31.11810.2.31.118
12010.2.31.119/3210.2.31.119 – 10.2.31.11910.2.31.119
12110.2.31.120/3210.2.31.120 – 10.2.31.12010.2.31.120
12210.2.31.121/3210.2.31.121 – 10.2.31.12110.2.31.121
12310.2.31.122/3210.2.31.122 – 10.2.31.12210.2.31.122
12410.2.31.123/3210.2.31.123 – 10.2.31.12310.2.31.123
12510.2.31.124/3210.2.31.124 – 10.2.31.12410.2.31.124
12610.2.31.125/3210.2.31.125 – 10.2.31.12510.2.31.125
12710.2.31.126/3210.2.31.126 – 10.2.31.12610.2.31.126
12810.2.31.127/3210.2.31.127 – 10.2.31.12710.2.31.127
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 →