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)10.2.108.0/24

network10.2.108.0/24

broadcast10.2.108.255

first host10.2.108.1

last host10.2.108.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.108.0/24

address00001010.00000010.01101100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.01101100.00000000

broadcast00001010.00000010.01101100.11111111

green = network part, grey = host part

hex0x0a026c00

decimal167930880

reverse dns0.108.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:6c00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.108.0/30	10.2.108.1 – 10.2.108.2	10.2.108.3
2	10.2.108.4/30	10.2.108.5 – 10.2.108.6	10.2.108.7
3	10.2.108.8/30	10.2.108.9 – 10.2.108.10	10.2.108.11
4	10.2.108.12/30	10.2.108.13 – 10.2.108.14	10.2.108.15
5	10.2.108.16/30	10.2.108.17 – 10.2.108.18	10.2.108.19
6	10.2.108.20/30	10.2.108.21 – 10.2.108.22	10.2.108.23
7	10.2.108.24/30	10.2.108.25 – 10.2.108.26	10.2.108.27
8	10.2.108.28/30	10.2.108.29 – 10.2.108.30	10.2.108.31
9	10.2.108.32/30	10.2.108.33 – 10.2.108.34	10.2.108.35
10	10.2.108.36/30	10.2.108.37 – 10.2.108.38	10.2.108.39
11	10.2.108.40/30	10.2.108.41 – 10.2.108.42	10.2.108.43
12	10.2.108.44/30	10.2.108.45 – 10.2.108.46	10.2.108.47
13	10.2.108.48/30	10.2.108.49 – 10.2.108.50	10.2.108.51
14	10.2.108.52/30	10.2.108.53 – 10.2.108.54	10.2.108.55
15	10.2.108.56/30	10.2.108.57 – 10.2.108.58	10.2.108.59
16	10.2.108.60/30	10.2.108.61 – 10.2.108.62	10.2.108.63
17	10.2.108.64/30	10.2.108.65 – 10.2.108.66	10.2.108.67
18	10.2.108.68/30	10.2.108.69 – 10.2.108.70	10.2.108.71
19	10.2.108.72/30	10.2.108.73 – 10.2.108.74	10.2.108.75
20	10.2.108.76/30	10.2.108.77 – 10.2.108.78	10.2.108.79
21	10.2.108.80/30	10.2.108.81 – 10.2.108.82	10.2.108.83
22	10.2.108.84/30	10.2.108.85 – 10.2.108.86	10.2.108.87
23	10.2.108.88/30	10.2.108.89 – 10.2.108.90	10.2.108.91
24	10.2.108.92/30	10.2.108.93 – 10.2.108.94	10.2.108.95
25	10.2.108.96/30	10.2.108.97 – 10.2.108.98	10.2.108.99
26	10.2.108.100/30	10.2.108.101 – 10.2.108.102	10.2.108.103
27	10.2.108.104/30	10.2.108.105 – 10.2.108.106	10.2.108.107
28	10.2.108.108/30	10.2.108.109 – 10.2.108.110	10.2.108.111
29	10.2.108.112/30	10.2.108.113 – 10.2.108.114	10.2.108.115
30	10.2.108.116/30	10.2.108.117 – 10.2.108.118	10.2.108.119
31	10.2.108.120/30	10.2.108.121 – 10.2.108.122	10.2.108.123
32	10.2.108.124/30	10.2.108.125 – 10.2.108.126	10.2.108.127
33	10.2.108.128/30	10.2.108.129 – 10.2.108.130	10.2.108.131
34	10.2.108.132/30	10.2.108.133 – 10.2.108.134	10.2.108.135
35	10.2.108.136/30	10.2.108.137 – 10.2.108.138	10.2.108.139
36	10.2.108.140/30	10.2.108.141 – 10.2.108.142	10.2.108.143
37	10.2.108.144/30	10.2.108.145 – 10.2.108.146	10.2.108.147
38	10.2.108.148/30	10.2.108.149 – 10.2.108.150	10.2.108.151
39	10.2.108.152/30	10.2.108.153 – 10.2.108.154	10.2.108.155
40	10.2.108.156/30	10.2.108.157 – 10.2.108.158	10.2.108.159
41	10.2.108.160/30	10.2.108.161 – 10.2.108.162	10.2.108.163
42	10.2.108.164/30	10.2.108.165 – 10.2.108.166	10.2.108.167
43	10.2.108.168/30	10.2.108.169 – 10.2.108.170	10.2.108.171
44	10.2.108.172/30	10.2.108.173 – 10.2.108.174	10.2.108.175
45	10.2.108.176/30	10.2.108.177 – 10.2.108.178	10.2.108.179
46	10.2.108.180/30	10.2.108.181 – 10.2.108.182	10.2.108.183
47	10.2.108.184/30	10.2.108.185 – 10.2.108.186	10.2.108.187
48	10.2.108.188/30	10.2.108.189 – 10.2.108.190	10.2.108.191
49	10.2.108.192/30	10.2.108.193 – 10.2.108.194	10.2.108.195
50	10.2.108.196/30	10.2.108.197 – 10.2.108.198	10.2.108.199
51	10.2.108.200/30	10.2.108.201 – 10.2.108.202	10.2.108.203
52	10.2.108.204/30	10.2.108.205 – 10.2.108.206	10.2.108.207
53	10.2.108.208/30	10.2.108.209 – 10.2.108.210	10.2.108.211
54	10.2.108.212/30	10.2.108.213 – 10.2.108.214	10.2.108.215
55	10.2.108.216/30	10.2.108.217 – 10.2.108.218	10.2.108.219
56	10.2.108.220/30	10.2.108.221 – 10.2.108.222	10.2.108.223
57	10.2.108.224/30	10.2.108.225 – 10.2.108.226	10.2.108.227
58	10.2.108.228/30	10.2.108.229 – 10.2.108.230	10.2.108.231
59	10.2.108.232/30	10.2.108.233 – 10.2.108.234	10.2.108.235
60	10.2.108.236/30	10.2.108.237 – 10.2.108.238	10.2.108.239
61	10.2.108.240/30	10.2.108.241 – 10.2.108.242	10.2.108.243
62	10.2.108.244/30	10.2.108.245 – 10.2.108.246	10.2.108.247
63	10.2.108.248/30	10.2.108.249 – 10.2.108.250	10.2.108.251
64	10.2.108.252/30	10.2.108.253 – 10.2.108.254	10.2.108.255

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 →