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)10.4.121.0/25
network10.4.121.0/25
broadcast10.4.121.127
first host10.4.121.1
last host10.4.121.126
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.4.121.0/25
address00001010.00000100.01111001.00000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000100.01111001.00000000
broadcast00001010.00000100.01111001.01111111
green = network part, grey = host part
hex0x0a047900
decimal168065280
reverse dns0.121.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:7900

/25 split into /32 · 128 subnets

close ×
#networkhost rangebroadcast
110.4.121.0/3210.4.121.0 – 10.4.121.010.4.121.0
210.4.121.1/3210.4.121.1 – 10.4.121.110.4.121.1
310.4.121.2/3210.4.121.2 – 10.4.121.210.4.121.2
410.4.121.3/3210.4.121.3 – 10.4.121.310.4.121.3
510.4.121.4/3210.4.121.4 – 10.4.121.410.4.121.4
610.4.121.5/3210.4.121.5 – 10.4.121.510.4.121.5
710.4.121.6/3210.4.121.6 – 10.4.121.610.4.121.6
810.4.121.7/3210.4.121.7 – 10.4.121.710.4.121.7
910.4.121.8/3210.4.121.8 – 10.4.121.810.4.121.8
1010.4.121.9/3210.4.121.9 – 10.4.121.910.4.121.9
1110.4.121.10/3210.4.121.10 – 10.4.121.1010.4.121.10
1210.4.121.11/3210.4.121.11 – 10.4.121.1110.4.121.11
1310.4.121.12/3210.4.121.12 – 10.4.121.1210.4.121.12
1410.4.121.13/3210.4.121.13 – 10.4.121.1310.4.121.13
1510.4.121.14/3210.4.121.14 – 10.4.121.1410.4.121.14
1610.4.121.15/3210.4.121.15 – 10.4.121.1510.4.121.15
1710.4.121.16/3210.4.121.16 – 10.4.121.1610.4.121.16
1810.4.121.17/3210.4.121.17 – 10.4.121.1710.4.121.17
1910.4.121.18/3210.4.121.18 – 10.4.121.1810.4.121.18
2010.4.121.19/3210.4.121.19 – 10.4.121.1910.4.121.19
2110.4.121.20/3210.4.121.20 – 10.4.121.2010.4.121.20
2210.4.121.21/3210.4.121.21 – 10.4.121.2110.4.121.21
2310.4.121.22/3210.4.121.22 – 10.4.121.2210.4.121.22
2410.4.121.23/3210.4.121.23 – 10.4.121.2310.4.121.23
2510.4.121.24/3210.4.121.24 – 10.4.121.2410.4.121.24
2610.4.121.25/3210.4.121.25 – 10.4.121.2510.4.121.25
2710.4.121.26/3210.4.121.26 – 10.4.121.2610.4.121.26
2810.4.121.27/3210.4.121.27 – 10.4.121.2710.4.121.27
2910.4.121.28/3210.4.121.28 – 10.4.121.2810.4.121.28
3010.4.121.29/3210.4.121.29 – 10.4.121.2910.4.121.29
3110.4.121.30/3210.4.121.30 – 10.4.121.3010.4.121.30
3210.4.121.31/3210.4.121.31 – 10.4.121.3110.4.121.31
3310.4.121.32/3210.4.121.32 – 10.4.121.3210.4.121.32
3410.4.121.33/3210.4.121.33 – 10.4.121.3310.4.121.33
3510.4.121.34/3210.4.121.34 – 10.4.121.3410.4.121.34
3610.4.121.35/3210.4.121.35 – 10.4.121.3510.4.121.35
3710.4.121.36/3210.4.121.36 – 10.4.121.3610.4.121.36
3810.4.121.37/3210.4.121.37 – 10.4.121.3710.4.121.37
3910.4.121.38/3210.4.121.38 – 10.4.121.3810.4.121.38
4010.4.121.39/3210.4.121.39 – 10.4.121.3910.4.121.39
4110.4.121.40/3210.4.121.40 – 10.4.121.4010.4.121.40
4210.4.121.41/3210.4.121.41 – 10.4.121.4110.4.121.41
4310.4.121.42/3210.4.121.42 – 10.4.121.4210.4.121.42
4410.4.121.43/3210.4.121.43 – 10.4.121.4310.4.121.43
4510.4.121.44/3210.4.121.44 – 10.4.121.4410.4.121.44
4610.4.121.45/3210.4.121.45 – 10.4.121.4510.4.121.45
4710.4.121.46/3210.4.121.46 – 10.4.121.4610.4.121.46
4810.4.121.47/3210.4.121.47 – 10.4.121.4710.4.121.47
4910.4.121.48/3210.4.121.48 – 10.4.121.4810.4.121.48
5010.4.121.49/3210.4.121.49 – 10.4.121.4910.4.121.49
5110.4.121.50/3210.4.121.50 – 10.4.121.5010.4.121.50
5210.4.121.51/3210.4.121.51 – 10.4.121.5110.4.121.51
5310.4.121.52/3210.4.121.52 – 10.4.121.5210.4.121.52
5410.4.121.53/3210.4.121.53 – 10.4.121.5310.4.121.53
5510.4.121.54/3210.4.121.54 – 10.4.121.5410.4.121.54
5610.4.121.55/3210.4.121.55 – 10.4.121.5510.4.121.55
5710.4.121.56/3210.4.121.56 – 10.4.121.5610.4.121.56
5810.4.121.57/3210.4.121.57 – 10.4.121.5710.4.121.57
5910.4.121.58/3210.4.121.58 – 10.4.121.5810.4.121.58
6010.4.121.59/3210.4.121.59 – 10.4.121.5910.4.121.59
6110.4.121.60/3210.4.121.60 – 10.4.121.6010.4.121.60
6210.4.121.61/3210.4.121.61 – 10.4.121.6110.4.121.61
6310.4.121.62/3210.4.121.62 – 10.4.121.6210.4.121.62
6410.4.121.63/3210.4.121.63 – 10.4.121.6310.4.121.63
6510.4.121.64/3210.4.121.64 – 10.4.121.6410.4.121.64
6610.4.121.65/3210.4.121.65 – 10.4.121.6510.4.121.65
6710.4.121.66/3210.4.121.66 – 10.4.121.6610.4.121.66
6810.4.121.67/3210.4.121.67 – 10.4.121.6710.4.121.67
6910.4.121.68/3210.4.121.68 – 10.4.121.6810.4.121.68
7010.4.121.69/3210.4.121.69 – 10.4.121.6910.4.121.69
7110.4.121.70/3210.4.121.70 – 10.4.121.7010.4.121.70
7210.4.121.71/3210.4.121.71 – 10.4.121.7110.4.121.71
7310.4.121.72/3210.4.121.72 – 10.4.121.7210.4.121.72
7410.4.121.73/3210.4.121.73 – 10.4.121.7310.4.121.73
7510.4.121.74/3210.4.121.74 – 10.4.121.7410.4.121.74
7610.4.121.75/3210.4.121.75 – 10.4.121.7510.4.121.75
7710.4.121.76/3210.4.121.76 – 10.4.121.7610.4.121.76
7810.4.121.77/3210.4.121.77 – 10.4.121.7710.4.121.77
7910.4.121.78/3210.4.121.78 – 10.4.121.7810.4.121.78
8010.4.121.79/3210.4.121.79 – 10.4.121.7910.4.121.79
8110.4.121.80/3210.4.121.80 – 10.4.121.8010.4.121.80
8210.4.121.81/3210.4.121.81 – 10.4.121.8110.4.121.81
8310.4.121.82/3210.4.121.82 – 10.4.121.8210.4.121.82
8410.4.121.83/3210.4.121.83 – 10.4.121.8310.4.121.83
8510.4.121.84/3210.4.121.84 – 10.4.121.8410.4.121.84
8610.4.121.85/3210.4.121.85 – 10.4.121.8510.4.121.85
8710.4.121.86/3210.4.121.86 – 10.4.121.8610.4.121.86
8810.4.121.87/3210.4.121.87 – 10.4.121.8710.4.121.87
8910.4.121.88/3210.4.121.88 – 10.4.121.8810.4.121.88
9010.4.121.89/3210.4.121.89 – 10.4.121.8910.4.121.89
9110.4.121.90/3210.4.121.90 – 10.4.121.9010.4.121.90
9210.4.121.91/3210.4.121.91 – 10.4.121.9110.4.121.91
9310.4.121.92/3210.4.121.92 – 10.4.121.9210.4.121.92
9410.4.121.93/3210.4.121.93 – 10.4.121.9310.4.121.93
9510.4.121.94/3210.4.121.94 – 10.4.121.9410.4.121.94
9610.4.121.95/3210.4.121.95 – 10.4.121.9510.4.121.95
9710.4.121.96/3210.4.121.96 – 10.4.121.9610.4.121.96
9810.4.121.97/3210.4.121.97 – 10.4.121.9710.4.121.97
9910.4.121.98/3210.4.121.98 – 10.4.121.9810.4.121.98
10010.4.121.99/3210.4.121.99 – 10.4.121.9910.4.121.99
10110.4.121.100/3210.4.121.100 – 10.4.121.10010.4.121.100
10210.4.121.101/3210.4.121.101 – 10.4.121.10110.4.121.101
10310.4.121.102/3210.4.121.102 – 10.4.121.10210.4.121.102
10410.4.121.103/3210.4.121.103 – 10.4.121.10310.4.121.103
10510.4.121.104/3210.4.121.104 – 10.4.121.10410.4.121.104
10610.4.121.105/3210.4.121.105 – 10.4.121.10510.4.121.105
10710.4.121.106/3210.4.121.106 – 10.4.121.10610.4.121.106
10810.4.121.107/3210.4.121.107 – 10.4.121.10710.4.121.107
10910.4.121.108/3210.4.121.108 – 10.4.121.10810.4.121.108
11010.4.121.109/3210.4.121.109 – 10.4.121.10910.4.121.109
11110.4.121.110/3210.4.121.110 – 10.4.121.11010.4.121.110
11210.4.121.111/3210.4.121.111 – 10.4.121.11110.4.121.111
11310.4.121.112/3210.4.121.112 – 10.4.121.11210.4.121.112
11410.4.121.113/3210.4.121.113 – 10.4.121.11310.4.121.113
11510.4.121.114/3210.4.121.114 – 10.4.121.11410.4.121.114
11610.4.121.115/3210.4.121.115 – 10.4.121.11510.4.121.115
11710.4.121.116/3210.4.121.116 – 10.4.121.11610.4.121.116
11810.4.121.117/3210.4.121.117 – 10.4.121.11710.4.121.117
11910.4.121.118/3210.4.121.118 – 10.4.121.11810.4.121.118
12010.4.121.119/3210.4.121.119 – 10.4.121.11910.4.121.119
12110.4.121.120/3210.4.121.120 – 10.4.121.12010.4.121.120
12210.4.121.121/3210.4.121.121 – 10.4.121.12110.4.121.121
12310.4.121.122/3210.4.121.122 – 10.4.121.12210.4.121.122
12410.4.121.123/3210.4.121.123 – 10.4.121.12310.4.121.123
12510.4.121.124/3210.4.121.124 – 10.4.121.12410.4.121.124
12610.4.121.125/3210.4.121.125 – 10.4.121.12510.4.121.125
12710.4.121.126/3210.4.121.126 – 10.4.121.12610.4.121.126
12810.4.121.127/3210.4.121.127 – 10.4.121.12710.4.121.127
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 →