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)10.166.83.0/24

network10.166.83.0/24

broadcast10.166.83.255

first host10.166.83.1

last host10.166.83.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.83.0/24

address00001010.10100110.01010011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.01010011.00000000

broadcast00001010.10100110.01010011.11111111

green = network part, grey = host part

hex0x0aa65300

decimal178672384

reverse dns0.83.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:5300

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.166.83.0/30	10.166.83.1 – 10.166.83.2	10.166.83.3
2	10.166.83.4/30	10.166.83.5 – 10.166.83.6	10.166.83.7
3	10.166.83.8/30	10.166.83.9 – 10.166.83.10	10.166.83.11
4	10.166.83.12/30	10.166.83.13 – 10.166.83.14	10.166.83.15
5	10.166.83.16/30	10.166.83.17 – 10.166.83.18	10.166.83.19
6	10.166.83.20/30	10.166.83.21 – 10.166.83.22	10.166.83.23
7	10.166.83.24/30	10.166.83.25 – 10.166.83.26	10.166.83.27
8	10.166.83.28/30	10.166.83.29 – 10.166.83.30	10.166.83.31
9	10.166.83.32/30	10.166.83.33 – 10.166.83.34	10.166.83.35
10	10.166.83.36/30	10.166.83.37 – 10.166.83.38	10.166.83.39
11	10.166.83.40/30	10.166.83.41 – 10.166.83.42	10.166.83.43
12	10.166.83.44/30	10.166.83.45 – 10.166.83.46	10.166.83.47
13	10.166.83.48/30	10.166.83.49 – 10.166.83.50	10.166.83.51
14	10.166.83.52/30	10.166.83.53 – 10.166.83.54	10.166.83.55
15	10.166.83.56/30	10.166.83.57 – 10.166.83.58	10.166.83.59
16	10.166.83.60/30	10.166.83.61 – 10.166.83.62	10.166.83.63
17	10.166.83.64/30	10.166.83.65 – 10.166.83.66	10.166.83.67
18	10.166.83.68/30	10.166.83.69 – 10.166.83.70	10.166.83.71
19	10.166.83.72/30	10.166.83.73 – 10.166.83.74	10.166.83.75
20	10.166.83.76/30	10.166.83.77 – 10.166.83.78	10.166.83.79
21	10.166.83.80/30	10.166.83.81 – 10.166.83.82	10.166.83.83
22	10.166.83.84/30	10.166.83.85 – 10.166.83.86	10.166.83.87
23	10.166.83.88/30	10.166.83.89 – 10.166.83.90	10.166.83.91
24	10.166.83.92/30	10.166.83.93 – 10.166.83.94	10.166.83.95
25	10.166.83.96/30	10.166.83.97 – 10.166.83.98	10.166.83.99
26	10.166.83.100/30	10.166.83.101 – 10.166.83.102	10.166.83.103
27	10.166.83.104/30	10.166.83.105 – 10.166.83.106	10.166.83.107
28	10.166.83.108/30	10.166.83.109 – 10.166.83.110	10.166.83.111
29	10.166.83.112/30	10.166.83.113 – 10.166.83.114	10.166.83.115
30	10.166.83.116/30	10.166.83.117 – 10.166.83.118	10.166.83.119
31	10.166.83.120/30	10.166.83.121 – 10.166.83.122	10.166.83.123
32	10.166.83.124/30	10.166.83.125 – 10.166.83.126	10.166.83.127
33	10.166.83.128/30	10.166.83.129 – 10.166.83.130	10.166.83.131
34	10.166.83.132/30	10.166.83.133 – 10.166.83.134	10.166.83.135
35	10.166.83.136/30	10.166.83.137 – 10.166.83.138	10.166.83.139
36	10.166.83.140/30	10.166.83.141 – 10.166.83.142	10.166.83.143
37	10.166.83.144/30	10.166.83.145 – 10.166.83.146	10.166.83.147
38	10.166.83.148/30	10.166.83.149 – 10.166.83.150	10.166.83.151
39	10.166.83.152/30	10.166.83.153 – 10.166.83.154	10.166.83.155
40	10.166.83.156/30	10.166.83.157 – 10.166.83.158	10.166.83.159
41	10.166.83.160/30	10.166.83.161 – 10.166.83.162	10.166.83.163
42	10.166.83.164/30	10.166.83.165 – 10.166.83.166	10.166.83.167
43	10.166.83.168/30	10.166.83.169 – 10.166.83.170	10.166.83.171
44	10.166.83.172/30	10.166.83.173 – 10.166.83.174	10.166.83.175
45	10.166.83.176/30	10.166.83.177 – 10.166.83.178	10.166.83.179
46	10.166.83.180/30	10.166.83.181 – 10.166.83.182	10.166.83.183
47	10.166.83.184/30	10.166.83.185 – 10.166.83.186	10.166.83.187
48	10.166.83.188/30	10.166.83.189 – 10.166.83.190	10.166.83.191
49	10.166.83.192/30	10.166.83.193 – 10.166.83.194	10.166.83.195
50	10.166.83.196/30	10.166.83.197 – 10.166.83.198	10.166.83.199
51	10.166.83.200/30	10.166.83.201 – 10.166.83.202	10.166.83.203
52	10.166.83.204/30	10.166.83.205 – 10.166.83.206	10.166.83.207
53	10.166.83.208/30	10.166.83.209 – 10.166.83.210	10.166.83.211
54	10.166.83.212/30	10.166.83.213 – 10.166.83.214	10.166.83.215
55	10.166.83.216/30	10.166.83.217 – 10.166.83.218	10.166.83.219
56	10.166.83.220/30	10.166.83.221 – 10.166.83.222	10.166.83.223
57	10.166.83.224/30	10.166.83.225 – 10.166.83.226	10.166.83.227
58	10.166.83.228/30	10.166.83.229 – 10.166.83.230	10.166.83.231
59	10.166.83.232/30	10.166.83.233 – 10.166.83.234	10.166.83.235
60	10.166.83.236/30	10.166.83.237 – 10.166.83.238	10.166.83.239
61	10.166.83.240/30	10.166.83.241 – 10.166.83.242	10.166.83.243
62	10.166.83.244/30	10.166.83.245 – 10.166.83.246	10.166.83.247
63	10.166.83.248/30	10.166.83.249 – 10.166.83.250	10.166.83.251
64	10.166.83.252/30	10.166.83.253 – 10.166.83.254	10.166.83.255

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 →