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)10.0.178.0/24

network10.0.178.0/24

broadcast10.0.178.255

first host10.0.178.1

last host10.0.178.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.178.0/24

address00001010.00000000.10110010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10110010.00000000

broadcast00001010.00000000.10110010.11111111

green = network part, grey = host part

hex0x0a00b200

decimal167817728

reverse dns0.178.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:b200

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.178.0/30	10.0.178.1 – 10.0.178.2	10.0.178.3
2	10.0.178.4/30	10.0.178.5 – 10.0.178.6	10.0.178.7
3	10.0.178.8/30	10.0.178.9 – 10.0.178.10	10.0.178.11
4	10.0.178.12/30	10.0.178.13 – 10.0.178.14	10.0.178.15
5	10.0.178.16/30	10.0.178.17 – 10.0.178.18	10.0.178.19
6	10.0.178.20/30	10.0.178.21 – 10.0.178.22	10.0.178.23
7	10.0.178.24/30	10.0.178.25 – 10.0.178.26	10.0.178.27
8	10.0.178.28/30	10.0.178.29 – 10.0.178.30	10.0.178.31
9	10.0.178.32/30	10.0.178.33 – 10.0.178.34	10.0.178.35
10	10.0.178.36/30	10.0.178.37 – 10.0.178.38	10.0.178.39
11	10.0.178.40/30	10.0.178.41 – 10.0.178.42	10.0.178.43
12	10.0.178.44/30	10.0.178.45 – 10.0.178.46	10.0.178.47
13	10.0.178.48/30	10.0.178.49 – 10.0.178.50	10.0.178.51
14	10.0.178.52/30	10.0.178.53 – 10.0.178.54	10.0.178.55
15	10.0.178.56/30	10.0.178.57 – 10.0.178.58	10.0.178.59
16	10.0.178.60/30	10.0.178.61 – 10.0.178.62	10.0.178.63
17	10.0.178.64/30	10.0.178.65 – 10.0.178.66	10.0.178.67
18	10.0.178.68/30	10.0.178.69 – 10.0.178.70	10.0.178.71
19	10.0.178.72/30	10.0.178.73 – 10.0.178.74	10.0.178.75
20	10.0.178.76/30	10.0.178.77 – 10.0.178.78	10.0.178.79
21	10.0.178.80/30	10.0.178.81 – 10.0.178.82	10.0.178.83
22	10.0.178.84/30	10.0.178.85 – 10.0.178.86	10.0.178.87
23	10.0.178.88/30	10.0.178.89 – 10.0.178.90	10.0.178.91
24	10.0.178.92/30	10.0.178.93 – 10.0.178.94	10.0.178.95
25	10.0.178.96/30	10.0.178.97 – 10.0.178.98	10.0.178.99
26	10.0.178.100/30	10.0.178.101 – 10.0.178.102	10.0.178.103
27	10.0.178.104/30	10.0.178.105 – 10.0.178.106	10.0.178.107
28	10.0.178.108/30	10.0.178.109 – 10.0.178.110	10.0.178.111
29	10.0.178.112/30	10.0.178.113 – 10.0.178.114	10.0.178.115
30	10.0.178.116/30	10.0.178.117 – 10.0.178.118	10.0.178.119
31	10.0.178.120/30	10.0.178.121 – 10.0.178.122	10.0.178.123
32	10.0.178.124/30	10.0.178.125 – 10.0.178.126	10.0.178.127
33	10.0.178.128/30	10.0.178.129 – 10.0.178.130	10.0.178.131
34	10.0.178.132/30	10.0.178.133 – 10.0.178.134	10.0.178.135
35	10.0.178.136/30	10.0.178.137 – 10.0.178.138	10.0.178.139
36	10.0.178.140/30	10.0.178.141 – 10.0.178.142	10.0.178.143
37	10.0.178.144/30	10.0.178.145 – 10.0.178.146	10.0.178.147
38	10.0.178.148/30	10.0.178.149 – 10.0.178.150	10.0.178.151
39	10.0.178.152/30	10.0.178.153 – 10.0.178.154	10.0.178.155
40	10.0.178.156/30	10.0.178.157 – 10.0.178.158	10.0.178.159
41	10.0.178.160/30	10.0.178.161 – 10.0.178.162	10.0.178.163
42	10.0.178.164/30	10.0.178.165 – 10.0.178.166	10.0.178.167
43	10.0.178.168/30	10.0.178.169 – 10.0.178.170	10.0.178.171
44	10.0.178.172/30	10.0.178.173 – 10.0.178.174	10.0.178.175
45	10.0.178.176/30	10.0.178.177 – 10.0.178.178	10.0.178.179
46	10.0.178.180/30	10.0.178.181 – 10.0.178.182	10.0.178.183
47	10.0.178.184/30	10.0.178.185 – 10.0.178.186	10.0.178.187
48	10.0.178.188/30	10.0.178.189 – 10.0.178.190	10.0.178.191
49	10.0.178.192/30	10.0.178.193 – 10.0.178.194	10.0.178.195
50	10.0.178.196/30	10.0.178.197 – 10.0.178.198	10.0.178.199
51	10.0.178.200/30	10.0.178.201 – 10.0.178.202	10.0.178.203
52	10.0.178.204/30	10.0.178.205 – 10.0.178.206	10.0.178.207
53	10.0.178.208/30	10.0.178.209 – 10.0.178.210	10.0.178.211
54	10.0.178.212/30	10.0.178.213 – 10.0.178.214	10.0.178.215
55	10.0.178.216/30	10.0.178.217 – 10.0.178.218	10.0.178.219
56	10.0.178.220/30	10.0.178.221 – 10.0.178.222	10.0.178.223
57	10.0.178.224/30	10.0.178.225 – 10.0.178.226	10.0.178.227
58	10.0.178.228/30	10.0.178.229 – 10.0.178.230	10.0.178.231
59	10.0.178.232/30	10.0.178.233 – 10.0.178.234	10.0.178.235
60	10.0.178.236/30	10.0.178.237 – 10.0.178.238	10.0.178.239
61	10.0.178.240/30	10.0.178.241 – 10.0.178.242	10.0.178.243
62	10.0.178.244/30	10.0.178.245 – 10.0.178.246	10.0.178.247
63	10.0.178.248/30	10.0.178.249 – 10.0.178.250	10.0.178.251
64	10.0.178.252/30	10.0.178.253 – 10.0.178.254	10.0.178.255

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 →