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)10.2.133.0/24

network10.2.133.0/24

broadcast10.2.133.255

first host10.2.133.1

last host10.2.133.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.133.0/24

address00001010.00000010.10000101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10000101.00000000

broadcast00001010.00000010.10000101.11111111

green = network part, grey = host part

hex0x0a028500

decimal167937280

reverse dns0.133.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8500

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.133.0/30	10.2.133.1 – 10.2.133.2	10.2.133.3
2	10.2.133.4/30	10.2.133.5 – 10.2.133.6	10.2.133.7
3	10.2.133.8/30	10.2.133.9 – 10.2.133.10	10.2.133.11
4	10.2.133.12/30	10.2.133.13 – 10.2.133.14	10.2.133.15
5	10.2.133.16/30	10.2.133.17 – 10.2.133.18	10.2.133.19
6	10.2.133.20/30	10.2.133.21 – 10.2.133.22	10.2.133.23
7	10.2.133.24/30	10.2.133.25 – 10.2.133.26	10.2.133.27
8	10.2.133.28/30	10.2.133.29 – 10.2.133.30	10.2.133.31
9	10.2.133.32/30	10.2.133.33 – 10.2.133.34	10.2.133.35
10	10.2.133.36/30	10.2.133.37 – 10.2.133.38	10.2.133.39
11	10.2.133.40/30	10.2.133.41 – 10.2.133.42	10.2.133.43
12	10.2.133.44/30	10.2.133.45 – 10.2.133.46	10.2.133.47
13	10.2.133.48/30	10.2.133.49 – 10.2.133.50	10.2.133.51
14	10.2.133.52/30	10.2.133.53 – 10.2.133.54	10.2.133.55
15	10.2.133.56/30	10.2.133.57 – 10.2.133.58	10.2.133.59
16	10.2.133.60/30	10.2.133.61 – 10.2.133.62	10.2.133.63
17	10.2.133.64/30	10.2.133.65 – 10.2.133.66	10.2.133.67
18	10.2.133.68/30	10.2.133.69 – 10.2.133.70	10.2.133.71
19	10.2.133.72/30	10.2.133.73 – 10.2.133.74	10.2.133.75
20	10.2.133.76/30	10.2.133.77 – 10.2.133.78	10.2.133.79
21	10.2.133.80/30	10.2.133.81 – 10.2.133.82	10.2.133.83
22	10.2.133.84/30	10.2.133.85 – 10.2.133.86	10.2.133.87
23	10.2.133.88/30	10.2.133.89 – 10.2.133.90	10.2.133.91
24	10.2.133.92/30	10.2.133.93 – 10.2.133.94	10.2.133.95
25	10.2.133.96/30	10.2.133.97 – 10.2.133.98	10.2.133.99
26	10.2.133.100/30	10.2.133.101 – 10.2.133.102	10.2.133.103
27	10.2.133.104/30	10.2.133.105 – 10.2.133.106	10.2.133.107
28	10.2.133.108/30	10.2.133.109 – 10.2.133.110	10.2.133.111
29	10.2.133.112/30	10.2.133.113 – 10.2.133.114	10.2.133.115
30	10.2.133.116/30	10.2.133.117 – 10.2.133.118	10.2.133.119
31	10.2.133.120/30	10.2.133.121 – 10.2.133.122	10.2.133.123
32	10.2.133.124/30	10.2.133.125 – 10.2.133.126	10.2.133.127
33	10.2.133.128/30	10.2.133.129 – 10.2.133.130	10.2.133.131
34	10.2.133.132/30	10.2.133.133 – 10.2.133.134	10.2.133.135
35	10.2.133.136/30	10.2.133.137 – 10.2.133.138	10.2.133.139
36	10.2.133.140/30	10.2.133.141 – 10.2.133.142	10.2.133.143
37	10.2.133.144/30	10.2.133.145 – 10.2.133.146	10.2.133.147
38	10.2.133.148/30	10.2.133.149 – 10.2.133.150	10.2.133.151
39	10.2.133.152/30	10.2.133.153 – 10.2.133.154	10.2.133.155
40	10.2.133.156/30	10.2.133.157 – 10.2.133.158	10.2.133.159
41	10.2.133.160/30	10.2.133.161 – 10.2.133.162	10.2.133.163
42	10.2.133.164/30	10.2.133.165 – 10.2.133.166	10.2.133.167
43	10.2.133.168/30	10.2.133.169 – 10.2.133.170	10.2.133.171
44	10.2.133.172/30	10.2.133.173 – 10.2.133.174	10.2.133.175
45	10.2.133.176/30	10.2.133.177 – 10.2.133.178	10.2.133.179
46	10.2.133.180/30	10.2.133.181 – 10.2.133.182	10.2.133.183
47	10.2.133.184/30	10.2.133.185 – 10.2.133.186	10.2.133.187
48	10.2.133.188/30	10.2.133.189 – 10.2.133.190	10.2.133.191
49	10.2.133.192/30	10.2.133.193 – 10.2.133.194	10.2.133.195
50	10.2.133.196/30	10.2.133.197 – 10.2.133.198	10.2.133.199
51	10.2.133.200/30	10.2.133.201 – 10.2.133.202	10.2.133.203
52	10.2.133.204/30	10.2.133.205 – 10.2.133.206	10.2.133.207
53	10.2.133.208/30	10.2.133.209 – 10.2.133.210	10.2.133.211
54	10.2.133.212/30	10.2.133.213 – 10.2.133.214	10.2.133.215
55	10.2.133.216/30	10.2.133.217 – 10.2.133.218	10.2.133.219
56	10.2.133.220/30	10.2.133.221 – 10.2.133.222	10.2.133.223
57	10.2.133.224/30	10.2.133.225 – 10.2.133.226	10.2.133.227
58	10.2.133.228/30	10.2.133.229 – 10.2.133.230	10.2.133.231
59	10.2.133.232/30	10.2.133.233 – 10.2.133.234	10.2.133.235
60	10.2.133.236/30	10.2.133.237 – 10.2.133.238	10.2.133.239
61	10.2.133.240/30	10.2.133.241 – 10.2.133.242	10.2.133.243
62	10.2.133.244/30	10.2.133.245 – 10.2.133.246	10.2.133.247
63	10.2.133.248/30	10.2.133.249 – 10.2.133.250	10.2.133.251
64	10.2.133.252/30	10.2.133.253 – 10.2.133.254	10.2.133.255

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 →