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)10.78.220.0/24

network10.78.220.0/24

broadcast10.78.220.255

first host10.78.220.1

last host10.78.220.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.220.0/24

address00001010.01001110.11011100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11011100.00000000

broadcast00001010.01001110.11011100.11111111

green = network part, grey = host part

hex0x0a4edc00

decimal172940288

reverse dns0.220.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:dc00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.78.220.0/30	10.78.220.1 – 10.78.220.2	10.78.220.3
2	10.78.220.4/30	10.78.220.5 – 10.78.220.6	10.78.220.7
3	10.78.220.8/30	10.78.220.9 – 10.78.220.10	10.78.220.11
4	10.78.220.12/30	10.78.220.13 – 10.78.220.14	10.78.220.15
5	10.78.220.16/30	10.78.220.17 – 10.78.220.18	10.78.220.19
6	10.78.220.20/30	10.78.220.21 – 10.78.220.22	10.78.220.23
7	10.78.220.24/30	10.78.220.25 – 10.78.220.26	10.78.220.27
8	10.78.220.28/30	10.78.220.29 – 10.78.220.30	10.78.220.31
9	10.78.220.32/30	10.78.220.33 – 10.78.220.34	10.78.220.35
10	10.78.220.36/30	10.78.220.37 – 10.78.220.38	10.78.220.39
11	10.78.220.40/30	10.78.220.41 – 10.78.220.42	10.78.220.43
12	10.78.220.44/30	10.78.220.45 – 10.78.220.46	10.78.220.47
13	10.78.220.48/30	10.78.220.49 – 10.78.220.50	10.78.220.51
14	10.78.220.52/30	10.78.220.53 – 10.78.220.54	10.78.220.55
15	10.78.220.56/30	10.78.220.57 – 10.78.220.58	10.78.220.59
16	10.78.220.60/30	10.78.220.61 – 10.78.220.62	10.78.220.63
17	10.78.220.64/30	10.78.220.65 – 10.78.220.66	10.78.220.67
18	10.78.220.68/30	10.78.220.69 – 10.78.220.70	10.78.220.71
19	10.78.220.72/30	10.78.220.73 – 10.78.220.74	10.78.220.75
20	10.78.220.76/30	10.78.220.77 – 10.78.220.78	10.78.220.79
21	10.78.220.80/30	10.78.220.81 – 10.78.220.82	10.78.220.83
22	10.78.220.84/30	10.78.220.85 – 10.78.220.86	10.78.220.87
23	10.78.220.88/30	10.78.220.89 – 10.78.220.90	10.78.220.91
24	10.78.220.92/30	10.78.220.93 – 10.78.220.94	10.78.220.95
25	10.78.220.96/30	10.78.220.97 – 10.78.220.98	10.78.220.99
26	10.78.220.100/30	10.78.220.101 – 10.78.220.102	10.78.220.103
27	10.78.220.104/30	10.78.220.105 – 10.78.220.106	10.78.220.107
28	10.78.220.108/30	10.78.220.109 – 10.78.220.110	10.78.220.111
29	10.78.220.112/30	10.78.220.113 – 10.78.220.114	10.78.220.115
30	10.78.220.116/30	10.78.220.117 – 10.78.220.118	10.78.220.119
31	10.78.220.120/30	10.78.220.121 – 10.78.220.122	10.78.220.123
32	10.78.220.124/30	10.78.220.125 – 10.78.220.126	10.78.220.127
33	10.78.220.128/30	10.78.220.129 – 10.78.220.130	10.78.220.131
34	10.78.220.132/30	10.78.220.133 – 10.78.220.134	10.78.220.135
35	10.78.220.136/30	10.78.220.137 – 10.78.220.138	10.78.220.139
36	10.78.220.140/30	10.78.220.141 – 10.78.220.142	10.78.220.143
37	10.78.220.144/30	10.78.220.145 – 10.78.220.146	10.78.220.147
38	10.78.220.148/30	10.78.220.149 – 10.78.220.150	10.78.220.151
39	10.78.220.152/30	10.78.220.153 – 10.78.220.154	10.78.220.155
40	10.78.220.156/30	10.78.220.157 – 10.78.220.158	10.78.220.159
41	10.78.220.160/30	10.78.220.161 – 10.78.220.162	10.78.220.163
42	10.78.220.164/30	10.78.220.165 – 10.78.220.166	10.78.220.167
43	10.78.220.168/30	10.78.220.169 – 10.78.220.170	10.78.220.171
44	10.78.220.172/30	10.78.220.173 – 10.78.220.174	10.78.220.175
45	10.78.220.176/30	10.78.220.177 – 10.78.220.178	10.78.220.179
46	10.78.220.180/30	10.78.220.181 – 10.78.220.182	10.78.220.183
47	10.78.220.184/30	10.78.220.185 – 10.78.220.186	10.78.220.187
48	10.78.220.188/30	10.78.220.189 – 10.78.220.190	10.78.220.191
49	10.78.220.192/30	10.78.220.193 – 10.78.220.194	10.78.220.195
50	10.78.220.196/30	10.78.220.197 – 10.78.220.198	10.78.220.199
51	10.78.220.200/30	10.78.220.201 – 10.78.220.202	10.78.220.203
52	10.78.220.204/30	10.78.220.205 – 10.78.220.206	10.78.220.207
53	10.78.220.208/30	10.78.220.209 – 10.78.220.210	10.78.220.211
54	10.78.220.212/30	10.78.220.213 – 10.78.220.214	10.78.220.215
55	10.78.220.216/30	10.78.220.217 – 10.78.220.218	10.78.220.219
56	10.78.220.220/30	10.78.220.221 – 10.78.220.222	10.78.220.223
57	10.78.220.224/30	10.78.220.225 – 10.78.220.226	10.78.220.227
58	10.78.220.228/30	10.78.220.229 – 10.78.220.230	10.78.220.231
59	10.78.220.232/30	10.78.220.233 – 10.78.220.234	10.78.220.235
60	10.78.220.236/30	10.78.220.237 – 10.78.220.238	10.78.220.239
61	10.78.220.240/30	10.78.220.241 – 10.78.220.242	10.78.220.243
62	10.78.220.244/30	10.78.220.245 – 10.78.220.246	10.78.220.247
63	10.78.220.248/30	10.78.220.249 – 10.78.220.250	10.78.220.251
64	10.78.220.252/30	10.78.220.253 – 10.78.220.254	10.78.220.255

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 →