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)10.2.216.0/24

network10.2.216.0/24

broadcast10.2.216.255

first host10.2.216.1

last host10.2.216.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.216.0/24

address00001010.00000010.11011000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11011000.00000000

broadcast00001010.00000010.11011000.11111111

green = network part, grey = host part

hex0x0a02d800

decimal167958528

reverse dns0.216.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d800

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.216.0/30	10.2.216.1 – 10.2.216.2	10.2.216.3
2	10.2.216.4/30	10.2.216.5 – 10.2.216.6	10.2.216.7
3	10.2.216.8/30	10.2.216.9 – 10.2.216.10	10.2.216.11
4	10.2.216.12/30	10.2.216.13 – 10.2.216.14	10.2.216.15
5	10.2.216.16/30	10.2.216.17 – 10.2.216.18	10.2.216.19
6	10.2.216.20/30	10.2.216.21 – 10.2.216.22	10.2.216.23
7	10.2.216.24/30	10.2.216.25 – 10.2.216.26	10.2.216.27
8	10.2.216.28/30	10.2.216.29 – 10.2.216.30	10.2.216.31
9	10.2.216.32/30	10.2.216.33 – 10.2.216.34	10.2.216.35
10	10.2.216.36/30	10.2.216.37 – 10.2.216.38	10.2.216.39
11	10.2.216.40/30	10.2.216.41 – 10.2.216.42	10.2.216.43
12	10.2.216.44/30	10.2.216.45 – 10.2.216.46	10.2.216.47
13	10.2.216.48/30	10.2.216.49 – 10.2.216.50	10.2.216.51
14	10.2.216.52/30	10.2.216.53 – 10.2.216.54	10.2.216.55
15	10.2.216.56/30	10.2.216.57 – 10.2.216.58	10.2.216.59
16	10.2.216.60/30	10.2.216.61 – 10.2.216.62	10.2.216.63
17	10.2.216.64/30	10.2.216.65 – 10.2.216.66	10.2.216.67
18	10.2.216.68/30	10.2.216.69 – 10.2.216.70	10.2.216.71
19	10.2.216.72/30	10.2.216.73 – 10.2.216.74	10.2.216.75
20	10.2.216.76/30	10.2.216.77 – 10.2.216.78	10.2.216.79
21	10.2.216.80/30	10.2.216.81 – 10.2.216.82	10.2.216.83
22	10.2.216.84/30	10.2.216.85 – 10.2.216.86	10.2.216.87
23	10.2.216.88/30	10.2.216.89 – 10.2.216.90	10.2.216.91
24	10.2.216.92/30	10.2.216.93 – 10.2.216.94	10.2.216.95
25	10.2.216.96/30	10.2.216.97 – 10.2.216.98	10.2.216.99
26	10.2.216.100/30	10.2.216.101 – 10.2.216.102	10.2.216.103
27	10.2.216.104/30	10.2.216.105 – 10.2.216.106	10.2.216.107
28	10.2.216.108/30	10.2.216.109 – 10.2.216.110	10.2.216.111
29	10.2.216.112/30	10.2.216.113 – 10.2.216.114	10.2.216.115
30	10.2.216.116/30	10.2.216.117 – 10.2.216.118	10.2.216.119
31	10.2.216.120/30	10.2.216.121 – 10.2.216.122	10.2.216.123
32	10.2.216.124/30	10.2.216.125 – 10.2.216.126	10.2.216.127
33	10.2.216.128/30	10.2.216.129 – 10.2.216.130	10.2.216.131
34	10.2.216.132/30	10.2.216.133 – 10.2.216.134	10.2.216.135
35	10.2.216.136/30	10.2.216.137 – 10.2.216.138	10.2.216.139
36	10.2.216.140/30	10.2.216.141 – 10.2.216.142	10.2.216.143
37	10.2.216.144/30	10.2.216.145 – 10.2.216.146	10.2.216.147
38	10.2.216.148/30	10.2.216.149 – 10.2.216.150	10.2.216.151
39	10.2.216.152/30	10.2.216.153 – 10.2.216.154	10.2.216.155
40	10.2.216.156/30	10.2.216.157 – 10.2.216.158	10.2.216.159
41	10.2.216.160/30	10.2.216.161 – 10.2.216.162	10.2.216.163
42	10.2.216.164/30	10.2.216.165 – 10.2.216.166	10.2.216.167
43	10.2.216.168/30	10.2.216.169 – 10.2.216.170	10.2.216.171
44	10.2.216.172/30	10.2.216.173 – 10.2.216.174	10.2.216.175
45	10.2.216.176/30	10.2.216.177 – 10.2.216.178	10.2.216.179
46	10.2.216.180/30	10.2.216.181 – 10.2.216.182	10.2.216.183
47	10.2.216.184/30	10.2.216.185 – 10.2.216.186	10.2.216.187
48	10.2.216.188/30	10.2.216.189 – 10.2.216.190	10.2.216.191
49	10.2.216.192/30	10.2.216.193 – 10.2.216.194	10.2.216.195
50	10.2.216.196/30	10.2.216.197 – 10.2.216.198	10.2.216.199
51	10.2.216.200/30	10.2.216.201 – 10.2.216.202	10.2.216.203
52	10.2.216.204/30	10.2.216.205 – 10.2.216.206	10.2.216.207
53	10.2.216.208/30	10.2.216.209 – 10.2.216.210	10.2.216.211
54	10.2.216.212/30	10.2.216.213 – 10.2.216.214	10.2.216.215
55	10.2.216.216/30	10.2.216.217 – 10.2.216.218	10.2.216.219
56	10.2.216.220/30	10.2.216.221 – 10.2.216.222	10.2.216.223
57	10.2.216.224/30	10.2.216.225 – 10.2.216.226	10.2.216.227
58	10.2.216.228/30	10.2.216.229 – 10.2.216.230	10.2.216.231
59	10.2.216.232/30	10.2.216.233 – 10.2.216.234	10.2.216.235
60	10.2.216.236/30	10.2.216.237 – 10.2.216.238	10.2.216.239
61	10.2.216.240/30	10.2.216.241 – 10.2.216.242	10.2.216.243
62	10.2.216.244/30	10.2.216.245 – 10.2.216.246	10.2.216.247
63	10.2.216.248/30	10.2.216.249 – 10.2.216.250	10.2.216.251
64	10.2.216.252/30	10.2.216.253 – 10.2.216.254	10.2.216.255

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 →