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)10.3.233.0/24

network10.3.233.0/24

broadcast10.3.233.255

first host10.3.233.1

last host10.3.233.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.233.0/24

address00001010.00000011.11101001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.11101001.00000000

broadcast00001010.00000011.11101001.11111111

green = network part, grey = host part

hex0x0a03e900

decimal168028416

reverse dns0.233.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.233.0/30	10.3.233.1 – 10.3.233.2	10.3.233.3
2	10.3.233.4/30	10.3.233.5 – 10.3.233.6	10.3.233.7
3	10.3.233.8/30	10.3.233.9 – 10.3.233.10	10.3.233.11
4	10.3.233.12/30	10.3.233.13 – 10.3.233.14	10.3.233.15
5	10.3.233.16/30	10.3.233.17 – 10.3.233.18	10.3.233.19
6	10.3.233.20/30	10.3.233.21 – 10.3.233.22	10.3.233.23
7	10.3.233.24/30	10.3.233.25 – 10.3.233.26	10.3.233.27
8	10.3.233.28/30	10.3.233.29 – 10.3.233.30	10.3.233.31
9	10.3.233.32/30	10.3.233.33 – 10.3.233.34	10.3.233.35
10	10.3.233.36/30	10.3.233.37 – 10.3.233.38	10.3.233.39
11	10.3.233.40/30	10.3.233.41 – 10.3.233.42	10.3.233.43
12	10.3.233.44/30	10.3.233.45 – 10.3.233.46	10.3.233.47
13	10.3.233.48/30	10.3.233.49 – 10.3.233.50	10.3.233.51
14	10.3.233.52/30	10.3.233.53 – 10.3.233.54	10.3.233.55
15	10.3.233.56/30	10.3.233.57 – 10.3.233.58	10.3.233.59
16	10.3.233.60/30	10.3.233.61 – 10.3.233.62	10.3.233.63
17	10.3.233.64/30	10.3.233.65 – 10.3.233.66	10.3.233.67
18	10.3.233.68/30	10.3.233.69 – 10.3.233.70	10.3.233.71
19	10.3.233.72/30	10.3.233.73 – 10.3.233.74	10.3.233.75
20	10.3.233.76/30	10.3.233.77 – 10.3.233.78	10.3.233.79
21	10.3.233.80/30	10.3.233.81 – 10.3.233.82	10.3.233.83
22	10.3.233.84/30	10.3.233.85 – 10.3.233.86	10.3.233.87
23	10.3.233.88/30	10.3.233.89 – 10.3.233.90	10.3.233.91
24	10.3.233.92/30	10.3.233.93 – 10.3.233.94	10.3.233.95
25	10.3.233.96/30	10.3.233.97 – 10.3.233.98	10.3.233.99
26	10.3.233.100/30	10.3.233.101 – 10.3.233.102	10.3.233.103
27	10.3.233.104/30	10.3.233.105 – 10.3.233.106	10.3.233.107
28	10.3.233.108/30	10.3.233.109 – 10.3.233.110	10.3.233.111
29	10.3.233.112/30	10.3.233.113 – 10.3.233.114	10.3.233.115
30	10.3.233.116/30	10.3.233.117 – 10.3.233.118	10.3.233.119
31	10.3.233.120/30	10.3.233.121 – 10.3.233.122	10.3.233.123
32	10.3.233.124/30	10.3.233.125 – 10.3.233.126	10.3.233.127
33	10.3.233.128/30	10.3.233.129 – 10.3.233.130	10.3.233.131
34	10.3.233.132/30	10.3.233.133 – 10.3.233.134	10.3.233.135
35	10.3.233.136/30	10.3.233.137 – 10.3.233.138	10.3.233.139
36	10.3.233.140/30	10.3.233.141 – 10.3.233.142	10.3.233.143
37	10.3.233.144/30	10.3.233.145 – 10.3.233.146	10.3.233.147
38	10.3.233.148/30	10.3.233.149 – 10.3.233.150	10.3.233.151
39	10.3.233.152/30	10.3.233.153 – 10.3.233.154	10.3.233.155
40	10.3.233.156/30	10.3.233.157 – 10.3.233.158	10.3.233.159
41	10.3.233.160/30	10.3.233.161 – 10.3.233.162	10.3.233.163
42	10.3.233.164/30	10.3.233.165 – 10.3.233.166	10.3.233.167
43	10.3.233.168/30	10.3.233.169 – 10.3.233.170	10.3.233.171
44	10.3.233.172/30	10.3.233.173 – 10.3.233.174	10.3.233.175
45	10.3.233.176/30	10.3.233.177 – 10.3.233.178	10.3.233.179
46	10.3.233.180/30	10.3.233.181 – 10.3.233.182	10.3.233.183
47	10.3.233.184/30	10.3.233.185 – 10.3.233.186	10.3.233.187
48	10.3.233.188/30	10.3.233.189 – 10.3.233.190	10.3.233.191
49	10.3.233.192/30	10.3.233.193 – 10.3.233.194	10.3.233.195
50	10.3.233.196/30	10.3.233.197 – 10.3.233.198	10.3.233.199
51	10.3.233.200/30	10.3.233.201 – 10.3.233.202	10.3.233.203
52	10.3.233.204/30	10.3.233.205 – 10.3.233.206	10.3.233.207
53	10.3.233.208/30	10.3.233.209 – 10.3.233.210	10.3.233.211
54	10.3.233.212/30	10.3.233.213 – 10.3.233.214	10.3.233.215
55	10.3.233.216/30	10.3.233.217 – 10.3.233.218	10.3.233.219
56	10.3.233.220/30	10.3.233.221 – 10.3.233.222	10.3.233.223
57	10.3.233.224/30	10.3.233.225 – 10.3.233.226	10.3.233.227
58	10.3.233.228/30	10.3.233.229 – 10.3.233.230	10.3.233.231
59	10.3.233.232/30	10.3.233.233 – 10.3.233.234	10.3.233.235
60	10.3.233.236/30	10.3.233.237 – 10.3.233.238	10.3.233.239
61	10.3.233.240/30	10.3.233.241 – 10.3.233.242	10.3.233.243
62	10.3.233.244/30	10.3.233.245 – 10.3.233.246	10.3.233.247
63	10.3.233.248/30	10.3.233.249 – 10.3.233.250	10.3.233.251
64	10.3.233.252/30	10.3.233.253 – 10.3.233.254	10.3.233.255

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 →