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)10.2.158.0/24

network10.2.158.0/24

broadcast10.2.158.255

first host10.2.158.1

last host10.2.158.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.158.0/24

address00001010.00000010.10011110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10011110.00000000

broadcast00001010.00000010.10011110.11111111

green = network part, grey = host part

hex0x0a029e00

decimal167943680

reverse dns0.158.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9e00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.158.0/30	10.2.158.1 – 10.2.158.2	10.2.158.3
2	10.2.158.4/30	10.2.158.5 – 10.2.158.6	10.2.158.7
3	10.2.158.8/30	10.2.158.9 – 10.2.158.10	10.2.158.11
4	10.2.158.12/30	10.2.158.13 – 10.2.158.14	10.2.158.15
5	10.2.158.16/30	10.2.158.17 – 10.2.158.18	10.2.158.19
6	10.2.158.20/30	10.2.158.21 – 10.2.158.22	10.2.158.23
7	10.2.158.24/30	10.2.158.25 – 10.2.158.26	10.2.158.27
8	10.2.158.28/30	10.2.158.29 – 10.2.158.30	10.2.158.31
9	10.2.158.32/30	10.2.158.33 – 10.2.158.34	10.2.158.35
10	10.2.158.36/30	10.2.158.37 – 10.2.158.38	10.2.158.39
11	10.2.158.40/30	10.2.158.41 – 10.2.158.42	10.2.158.43
12	10.2.158.44/30	10.2.158.45 – 10.2.158.46	10.2.158.47
13	10.2.158.48/30	10.2.158.49 – 10.2.158.50	10.2.158.51
14	10.2.158.52/30	10.2.158.53 – 10.2.158.54	10.2.158.55
15	10.2.158.56/30	10.2.158.57 – 10.2.158.58	10.2.158.59
16	10.2.158.60/30	10.2.158.61 – 10.2.158.62	10.2.158.63
17	10.2.158.64/30	10.2.158.65 – 10.2.158.66	10.2.158.67
18	10.2.158.68/30	10.2.158.69 – 10.2.158.70	10.2.158.71
19	10.2.158.72/30	10.2.158.73 – 10.2.158.74	10.2.158.75
20	10.2.158.76/30	10.2.158.77 – 10.2.158.78	10.2.158.79
21	10.2.158.80/30	10.2.158.81 – 10.2.158.82	10.2.158.83
22	10.2.158.84/30	10.2.158.85 – 10.2.158.86	10.2.158.87
23	10.2.158.88/30	10.2.158.89 – 10.2.158.90	10.2.158.91
24	10.2.158.92/30	10.2.158.93 – 10.2.158.94	10.2.158.95
25	10.2.158.96/30	10.2.158.97 – 10.2.158.98	10.2.158.99
26	10.2.158.100/30	10.2.158.101 – 10.2.158.102	10.2.158.103
27	10.2.158.104/30	10.2.158.105 – 10.2.158.106	10.2.158.107
28	10.2.158.108/30	10.2.158.109 – 10.2.158.110	10.2.158.111
29	10.2.158.112/30	10.2.158.113 – 10.2.158.114	10.2.158.115
30	10.2.158.116/30	10.2.158.117 – 10.2.158.118	10.2.158.119
31	10.2.158.120/30	10.2.158.121 – 10.2.158.122	10.2.158.123
32	10.2.158.124/30	10.2.158.125 – 10.2.158.126	10.2.158.127
33	10.2.158.128/30	10.2.158.129 – 10.2.158.130	10.2.158.131
34	10.2.158.132/30	10.2.158.133 – 10.2.158.134	10.2.158.135
35	10.2.158.136/30	10.2.158.137 – 10.2.158.138	10.2.158.139
36	10.2.158.140/30	10.2.158.141 – 10.2.158.142	10.2.158.143
37	10.2.158.144/30	10.2.158.145 – 10.2.158.146	10.2.158.147
38	10.2.158.148/30	10.2.158.149 – 10.2.158.150	10.2.158.151
39	10.2.158.152/30	10.2.158.153 – 10.2.158.154	10.2.158.155
40	10.2.158.156/30	10.2.158.157 – 10.2.158.158	10.2.158.159
41	10.2.158.160/30	10.2.158.161 – 10.2.158.162	10.2.158.163
42	10.2.158.164/30	10.2.158.165 – 10.2.158.166	10.2.158.167
43	10.2.158.168/30	10.2.158.169 – 10.2.158.170	10.2.158.171
44	10.2.158.172/30	10.2.158.173 – 10.2.158.174	10.2.158.175
45	10.2.158.176/30	10.2.158.177 – 10.2.158.178	10.2.158.179
46	10.2.158.180/30	10.2.158.181 – 10.2.158.182	10.2.158.183
47	10.2.158.184/30	10.2.158.185 – 10.2.158.186	10.2.158.187
48	10.2.158.188/30	10.2.158.189 – 10.2.158.190	10.2.158.191
49	10.2.158.192/30	10.2.158.193 – 10.2.158.194	10.2.158.195
50	10.2.158.196/30	10.2.158.197 – 10.2.158.198	10.2.158.199
51	10.2.158.200/30	10.2.158.201 – 10.2.158.202	10.2.158.203
52	10.2.158.204/30	10.2.158.205 – 10.2.158.206	10.2.158.207
53	10.2.158.208/30	10.2.158.209 – 10.2.158.210	10.2.158.211
54	10.2.158.212/30	10.2.158.213 – 10.2.158.214	10.2.158.215
55	10.2.158.216/30	10.2.158.217 – 10.2.158.218	10.2.158.219
56	10.2.158.220/30	10.2.158.221 – 10.2.158.222	10.2.158.223
57	10.2.158.224/30	10.2.158.225 – 10.2.158.226	10.2.158.227
58	10.2.158.228/30	10.2.158.229 – 10.2.158.230	10.2.158.231
59	10.2.158.232/30	10.2.158.233 – 10.2.158.234	10.2.158.235
60	10.2.158.236/30	10.2.158.237 – 10.2.158.238	10.2.158.239
61	10.2.158.240/30	10.2.158.241 – 10.2.158.242	10.2.158.243
62	10.2.158.244/30	10.2.158.245 – 10.2.158.246	10.2.158.247
63	10.2.158.248/30	10.2.158.249 – 10.2.158.250	10.2.158.251
64	10.2.158.252/30	10.2.158.253 – 10.2.158.254	10.2.158.255

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 →