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)10.78.115.0/24

network10.78.115.0/24

broadcast10.78.115.255

first host10.78.115.1

last host10.78.115.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.115.0/24

address00001010.01001110.01110011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.01110011.00000000

broadcast00001010.01001110.01110011.11111111

green = network part, grey = host part

hex0x0a4e7300

decimal172913408

reverse dns0.115.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:7300

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.78.115.0/30	10.78.115.1 – 10.78.115.2	10.78.115.3
2	10.78.115.4/30	10.78.115.5 – 10.78.115.6	10.78.115.7
3	10.78.115.8/30	10.78.115.9 – 10.78.115.10	10.78.115.11
4	10.78.115.12/30	10.78.115.13 – 10.78.115.14	10.78.115.15
5	10.78.115.16/30	10.78.115.17 – 10.78.115.18	10.78.115.19
6	10.78.115.20/30	10.78.115.21 – 10.78.115.22	10.78.115.23
7	10.78.115.24/30	10.78.115.25 – 10.78.115.26	10.78.115.27
8	10.78.115.28/30	10.78.115.29 – 10.78.115.30	10.78.115.31
9	10.78.115.32/30	10.78.115.33 – 10.78.115.34	10.78.115.35
10	10.78.115.36/30	10.78.115.37 – 10.78.115.38	10.78.115.39
11	10.78.115.40/30	10.78.115.41 – 10.78.115.42	10.78.115.43
12	10.78.115.44/30	10.78.115.45 – 10.78.115.46	10.78.115.47
13	10.78.115.48/30	10.78.115.49 – 10.78.115.50	10.78.115.51
14	10.78.115.52/30	10.78.115.53 – 10.78.115.54	10.78.115.55
15	10.78.115.56/30	10.78.115.57 – 10.78.115.58	10.78.115.59
16	10.78.115.60/30	10.78.115.61 – 10.78.115.62	10.78.115.63
17	10.78.115.64/30	10.78.115.65 – 10.78.115.66	10.78.115.67
18	10.78.115.68/30	10.78.115.69 – 10.78.115.70	10.78.115.71
19	10.78.115.72/30	10.78.115.73 – 10.78.115.74	10.78.115.75
20	10.78.115.76/30	10.78.115.77 – 10.78.115.78	10.78.115.79
21	10.78.115.80/30	10.78.115.81 – 10.78.115.82	10.78.115.83
22	10.78.115.84/30	10.78.115.85 – 10.78.115.86	10.78.115.87
23	10.78.115.88/30	10.78.115.89 – 10.78.115.90	10.78.115.91
24	10.78.115.92/30	10.78.115.93 – 10.78.115.94	10.78.115.95
25	10.78.115.96/30	10.78.115.97 – 10.78.115.98	10.78.115.99
26	10.78.115.100/30	10.78.115.101 – 10.78.115.102	10.78.115.103
27	10.78.115.104/30	10.78.115.105 – 10.78.115.106	10.78.115.107
28	10.78.115.108/30	10.78.115.109 – 10.78.115.110	10.78.115.111
29	10.78.115.112/30	10.78.115.113 – 10.78.115.114	10.78.115.115
30	10.78.115.116/30	10.78.115.117 – 10.78.115.118	10.78.115.119
31	10.78.115.120/30	10.78.115.121 – 10.78.115.122	10.78.115.123
32	10.78.115.124/30	10.78.115.125 – 10.78.115.126	10.78.115.127
33	10.78.115.128/30	10.78.115.129 – 10.78.115.130	10.78.115.131
34	10.78.115.132/30	10.78.115.133 – 10.78.115.134	10.78.115.135
35	10.78.115.136/30	10.78.115.137 – 10.78.115.138	10.78.115.139
36	10.78.115.140/30	10.78.115.141 – 10.78.115.142	10.78.115.143
37	10.78.115.144/30	10.78.115.145 – 10.78.115.146	10.78.115.147
38	10.78.115.148/30	10.78.115.149 – 10.78.115.150	10.78.115.151
39	10.78.115.152/30	10.78.115.153 – 10.78.115.154	10.78.115.155
40	10.78.115.156/30	10.78.115.157 – 10.78.115.158	10.78.115.159
41	10.78.115.160/30	10.78.115.161 – 10.78.115.162	10.78.115.163
42	10.78.115.164/30	10.78.115.165 – 10.78.115.166	10.78.115.167
43	10.78.115.168/30	10.78.115.169 – 10.78.115.170	10.78.115.171
44	10.78.115.172/30	10.78.115.173 – 10.78.115.174	10.78.115.175
45	10.78.115.176/30	10.78.115.177 – 10.78.115.178	10.78.115.179
46	10.78.115.180/30	10.78.115.181 – 10.78.115.182	10.78.115.183
47	10.78.115.184/30	10.78.115.185 – 10.78.115.186	10.78.115.187
48	10.78.115.188/30	10.78.115.189 – 10.78.115.190	10.78.115.191
49	10.78.115.192/30	10.78.115.193 – 10.78.115.194	10.78.115.195
50	10.78.115.196/30	10.78.115.197 – 10.78.115.198	10.78.115.199
51	10.78.115.200/30	10.78.115.201 – 10.78.115.202	10.78.115.203
52	10.78.115.204/30	10.78.115.205 – 10.78.115.206	10.78.115.207
53	10.78.115.208/30	10.78.115.209 – 10.78.115.210	10.78.115.211
54	10.78.115.212/30	10.78.115.213 – 10.78.115.214	10.78.115.215
55	10.78.115.216/30	10.78.115.217 – 10.78.115.218	10.78.115.219
56	10.78.115.220/30	10.78.115.221 – 10.78.115.222	10.78.115.223
57	10.78.115.224/30	10.78.115.225 – 10.78.115.226	10.78.115.227
58	10.78.115.228/30	10.78.115.229 – 10.78.115.230	10.78.115.231
59	10.78.115.232/30	10.78.115.233 – 10.78.115.234	10.78.115.235
60	10.78.115.236/30	10.78.115.237 – 10.78.115.238	10.78.115.239
61	10.78.115.240/30	10.78.115.241 – 10.78.115.242	10.78.115.243
62	10.78.115.244/30	10.78.115.245 – 10.78.115.246	10.78.115.247
63	10.78.115.248/30	10.78.115.249 – 10.78.115.250	10.78.115.251
64	10.78.115.252/30	10.78.115.253 – 10.78.115.254	10.78.115.255

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 →