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.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.0.106.0/24

network10.0.106.0/24

broadcast10.0.106.255

first host10.0.106.1

last host10.0.106.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.106.0/24

address00001010.00000000.01101010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01101010.00000000

broadcast00001010.00000000.01101010.11111111

green = network part, grey = host part

hex0x0a006a00

decimal167799296

reverse dns0.106.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6a00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.106.0/30	10.0.106.1 – 10.0.106.2	10.0.106.3
2	10.0.106.4/30	10.0.106.5 – 10.0.106.6	10.0.106.7
3	10.0.106.8/30	10.0.106.9 – 10.0.106.10	10.0.106.11
4	10.0.106.12/30	10.0.106.13 – 10.0.106.14	10.0.106.15
5	10.0.106.16/30	10.0.106.17 – 10.0.106.18	10.0.106.19
6	10.0.106.20/30	10.0.106.21 – 10.0.106.22	10.0.106.23
7	10.0.106.24/30	10.0.106.25 – 10.0.106.26	10.0.106.27
8	10.0.106.28/30	10.0.106.29 – 10.0.106.30	10.0.106.31
9	10.0.106.32/30	10.0.106.33 – 10.0.106.34	10.0.106.35
10	10.0.106.36/30	10.0.106.37 – 10.0.106.38	10.0.106.39
11	10.0.106.40/30	10.0.106.41 – 10.0.106.42	10.0.106.43
12	10.0.106.44/30	10.0.106.45 – 10.0.106.46	10.0.106.47
13	10.0.106.48/30	10.0.106.49 – 10.0.106.50	10.0.106.51
14	10.0.106.52/30	10.0.106.53 – 10.0.106.54	10.0.106.55
15	10.0.106.56/30	10.0.106.57 – 10.0.106.58	10.0.106.59
16	10.0.106.60/30	10.0.106.61 – 10.0.106.62	10.0.106.63
17	10.0.106.64/30	10.0.106.65 – 10.0.106.66	10.0.106.67
18	10.0.106.68/30	10.0.106.69 – 10.0.106.70	10.0.106.71
19	10.0.106.72/30	10.0.106.73 – 10.0.106.74	10.0.106.75
20	10.0.106.76/30	10.0.106.77 – 10.0.106.78	10.0.106.79
21	10.0.106.80/30	10.0.106.81 – 10.0.106.82	10.0.106.83
22	10.0.106.84/30	10.0.106.85 – 10.0.106.86	10.0.106.87
23	10.0.106.88/30	10.0.106.89 – 10.0.106.90	10.0.106.91
24	10.0.106.92/30	10.0.106.93 – 10.0.106.94	10.0.106.95
25	10.0.106.96/30	10.0.106.97 – 10.0.106.98	10.0.106.99
26	10.0.106.100/30	10.0.106.101 – 10.0.106.102	10.0.106.103
27	10.0.106.104/30	10.0.106.105 – 10.0.106.106	10.0.106.107
28	10.0.106.108/30	10.0.106.109 – 10.0.106.110	10.0.106.111
29	10.0.106.112/30	10.0.106.113 – 10.0.106.114	10.0.106.115
30	10.0.106.116/30	10.0.106.117 – 10.0.106.118	10.0.106.119
31	10.0.106.120/30	10.0.106.121 – 10.0.106.122	10.0.106.123
32	10.0.106.124/30	10.0.106.125 – 10.0.106.126	10.0.106.127
33	10.0.106.128/30	10.0.106.129 – 10.0.106.130	10.0.106.131
34	10.0.106.132/30	10.0.106.133 – 10.0.106.134	10.0.106.135
35	10.0.106.136/30	10.0.106.137 – 10.0.106.138	10.0.106.139
36	10.0.106.140/30	10.0.106.141 – 10.0.106.142	10.0.106.143
37	10.0.106.144/30	10.0.106.145 – 10.0.106.146	10.0.106.147
38	10.0.106.148/30	10.0.106.149 – 10.0.106.150	10.0.106.151
39	10.0.106.152/30	10.0.106.153 – 10.0.106.154	10.0.106.155
40	10.0.106.156/30	10.0.106.157 – 10.0.106.158	10.0.106.159
41	10.0.106.160/30	10.0.106.161 – 10.0.106.162	10.0.106.163
42	10.0.106.164/30	10.0.106.165 – 10.0.106.166	10.0.106.167
43	10.0.106.168/30	10.0.106.169 – 10.0.106.170	10.0.106.171
44	10.0.106.172/30	10.0.106.173 – 10.0.106.174	10.0.106.175
45	10.0.106.176/30	10.0.106.177 – 10.0.106.178	10.0.106.179
46	10.0.106.180/30	10.0.106.181 – 10.0.106.182	10.0.106.183
47	10.0.106.184/30	10.0.106.185 – 10.0.106.186	10.0.106.187
48	10.0.106.188/30	10.0.106.189 – 10.0.106.190	10.0.106.191
49	10.0.106.192/30	10.0.106.193 – 10.0.106.194	10.0.106.195
50	10.0.106.196/30	10.0.106.197 – 10.0.106.198	10.0.106.199
51	10.0.106.200/30	10.0.106.201 – 10.0.106.202	10.0.106.203
52	10.0.106.204/30	10.0.106.205 – 10.0.106.206	10.0.106.207
53	10.0.106.208/30	10.0.106.209 – 10.0.106.210	10.0.106.211
54	10.0.106.212/30	10.0.106.213 – 10.0.106.214	10.0.106.215
55	10.0.106.216/30	10.0.106.217 – 10.0.106.218	10.0.106.219
56	10.0.106.220/30	10.0.106.221 – 10.0.106.222	10.0.106.223
57	10.0.106.224/30	10.0.106.225 – 10.0.106.226	10.0.106.227
58	10.0.106.228/30	10.0.106.229 – 10.0.106.230	10.0.106.231
59	10.0.106.232/30	10.0.106.233 – 10.0.106.234	10.0.106.235
60	10.0.106.236/30	10.0.106.237 – 10.0.106.238	10.0.106.239
61	10.0.106.240/30	10.0.106.241 – 10.0.106.242	10.0.106.243
62	10.0.106.244/30	10.0.106.245 – 10.0.106.246	10.0.106.247
63	10.0.106.248/30	10.0.106.249 – 10.0.106.250	10.0.106.251
64	10.0.106.252/30	10.0.106.253 – 10.0.106.254	10.0.106.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /24
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →