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)10.0.118.0/24

network10.0.118.0/24

broadcast10.0.118.255

first host10.0.118.1

last host10.0.118.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.118.0/24

address00001010.00000000.01110110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01110110.00000000

broadcast00001010.00000000.01110110.11111111

green = network part, grey = host part

hex0x0a007600

decimal167802368

reverse dns0.118.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7600

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.118.0/30	10.0.118.1 – 10.0.118.2	10.0.118.3
2	10.0.118.4/30	10.0.118.5 – 10.0.118.6	10.0.118.7
3	10.0.118.8/30	10.0.118.9 – 10.0.118.10	10.0.118.11
4	10.0.118.12/30	10.0.118.13 – 10.0.118.14	10.0.118.15
5	10.0.118.16/30	10.0.118.17 – 10.0.118.18	10.0.118.19
6	10.0.118.20/30	10.0.118.21 – 10.0.118.22	10.0.118.23
7	10.0.118.24/30	10.0.118.25 – 10.0.118.26	10.0.118.27
8	10.0.118.28/30	10.0.118.29 – 10.0.118.30	10.0.118.31
9	10.0.118.32/30	10.0.118.33 – 10.0.118.34	10.0.118.35
10	10.0.118.36/30	10.0.118.37 – 10.0.118.38	10.0.118.39
11	10.0.118.40/30	10.0.118.41 – 10.0.118.42	10.0.118.43
12	10.0.118.44/30	10.0.118.45 – 10.0.118.46	10.0.118.47
13	10.0.118.48/30	10.0.118.49 – 10.0.118.50	10.0.118.51
14	10.0.118.52/30	10.0.118.53 – 10.0.118.54	10.0.118.55
15	10.0.118.56/30	10.0.118.57 – 10.0.118.58	10.0.118.59
16	10.0.118.60/30	10.0.118.61 – 10.0.118.62	10.0.118.63
17	10.0.118.64/30	10.0.118.65 – 10.0.118.66	10.0.118.67
18	10.0.118.68/30	10.0.118.69 – 10.0.118.70	10.0.118.71
19	10.0.118.72/30	10.0.118.73 – 10.0.118.74	10.0.118.75
20	10.0.118.76/30	10.0.118.77 – 10.0.118.78	10.0.118.79
21	10.0.118.80/30	10.0.118.81 – 10.0.118.82	10.0.118.83
22	10.0.118.84/30	10.0.118.85 – 10.0.118.86	10.0.118.87
23	10.0.118.88/30	10.0.118.89 – 10.0.118.90	10.0.118.91
24	10.0.118.92/30	10.0.118.93 – 10.0.118.94	10.0.118.95
25	10.0.118.96/30	10.0.118.97 – 10.0.118.98	10.0.118.99
26	10.0.118.100/30	10.0.118.101 – 10.0.118.102	10.0.118.103
27	10.0.118.104/30	10.0.118.105 – 10.0.118.106	10.0.118.107
28	10.0.118.108/30	10.0.118.109 – 10.0.118.110	10.0.118.111
29	10.0.118.112/30	10.0.118.113 – 10.0.118.114	10.0.118.115
30	10.0.118.116/30	10.0.118.117 – 10.0.118.118	10.0.118.119
31	10.0.118.120/30	10.0.118.121 – 10.0.118.122	10.0.118.123
32	10.0.118.124/30	10.0.118.125 – 10.0.118.126	10.0.118.127
33	10.0.118.128/30	10.0.118.129 – 10.0.118.130	10.0.118.131
34	10.0.118.132/30	10.0.118.133 – 10.0.118.134	10.0.118.135
35	10.0.118.136/30	10.0.118.137 – 10.0.118.138	10.0.118.139
36	10.0.118.140/30	10.0.118.141 – 10.0.118.142	10.0.118.143
37	10.0.118.144/30	10.0.118.145 – 10.0.118.146	10.0.118.147
38	10.0.118.148/30	10.0.118.149 – 10.0.118.150	10.0.118.151
39	10.0.118.152/30	10.0.118.153 – 10.0.118.154	10.0.118.155
40	10.0.118.156/30	10.0.118.157 – 10.0.118.158	10.0.118.159
41	10.0.118.160/30	10.0.118.161 – 10.0.118.162	10.0.118.163
42	10.0.118.164/30	10.0.118.165 – 10.0.118.166	10.0.118.167
43	10.0.118.168/30	10.0.118.169 – 10.0.118.170	10.0.118.171
44	10.0.118.172/30	10.0.118.173 – 10.0.118.174	10.0.118.175
45	10.0.118.176/30	10.0.118.177 – 10.0.118.178	10.0.118.179
46	10.0.118.180/30	10.0.118.181 – 10.0.118.182	10.0.118.183
47	10.0.118.184/30	10.0.118.185 – 10.0.118.186	10.0.118.187
48	10.0.118.188/30	10.0.118.189 – 10.0.118.190	10.0.118.191
49	10.0.118.192/30	10.0.118.193 – 10.0.118.194	10.0.118.195
50	10.0.118.196/30	10.0.118.197 – 10.0.118.198	10.0.118.199
51	10.0.118.200/30	10.0.118.201 – 10.0.118.202	10.0.118.203
52	10.0.118.204/30	10.0.118.205 – 10.0.118.206	10.0.118.207
53	10.0.118.208/30	10.0.118.209 – 10.0.118.210	10.0.118.211
54	10.0.118.212/30	10.0.118.213 – 10.0.118.214	10.0.118.215
55	10.0.118.216/30	10.0.118.217 – 10.0.118.218	10.0.118.219
56	10.0.118.220/30	10.0.118.221 – 10.0.118.222	10.0.118.223
57	10.0.118.224/30	10.0.118.225 – 10.0.118.226	10.0.118.227
58	10.0.118.228/30	10.0.118.229 – 10.0.118.230	10.0.118.231
59	10.0.118.232/30	10.0.118.233 – 10.0.118.234	10.0.118.235
60	10.0.118.236/30	10.0.118.237 – 10.0.118.238	10.0.118.239
61	10.0.118.240/30	10.0.118.241 – 10.0.118.242	10.0.118.243
62	10.0.118.244/30	10.0.118.245 – 10.0.118.246	10.0.118.247
63	10.0.118.248/30	10.0.118.249 – 10.0.118.250	10.0.118.251
64	10.0.118.252/30	10.0.118.253 – 10.0.118.254	10.0.118.255

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 →