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)10.78.202.0/24

network10.78.202.0/24

broadcast10.78.202.255

first host10.78.202.1

last host10.78.202.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.78.202.0/24

address00001010.01001110.11001010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001110.11001010.00000000

broadcast00001010.01001110.11001010.11111111

green = network part, grey = host part

hex0x0a4eca00

decimal172935680

reverse dns0.202.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:ca00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.78.202.0/30	10.78.202.1 – 10.78.202.2	10.78.202.3
2	10.78.202.4/30	10.78.202.5 – 10.78.202.6	10.78.202.7
3	10.78.202.8/30	10.78.202.9 – 10.78.202.10	10.78.202.11
4	10.78.202.12/30	10.78.202.13 – 10.78.202.14	10.78.202.15
5	10.78.202.16/30	10.78.202.17 – 10.78.202.18	10.78.202.19
6	10.78.202.20/30	10.78.202.21 – 10.78.202.22	10.78.202.23
7	10.78.202.24/30	10.78.202.25 – 10.78.202.26	10.78.202.27
8	10.78.202.28/30	10.78.202.29 – 10.78.202.30	10.78.202.31
9	10.78.202.32/30	10.78.202.33 – 10.78.202.34	10.78.202.35
10	10.78.202.36/30	10.78.202.37 – 10.78.202.38	10.78.202.39
11	10.78.202.40/30	10.78.202.41 – 10.78.202.42	10.78.202.43
12	10.78.202.44/30	10.78.202.45 – 10.78.202.46	10.78.202.47
13	10.78.202.48/30	10.78.202.49 – 10.78.202.50	10.78.202.51
14	10.78.202.52/30	10.78.202.53 – 10.78.202.54	10.78.202.55
15	10.78.202.56/30	10.78.202.57 – 10.78.202.58	10.78.202.59
16	10.78.202.60/30	10.78.202.61 – 10.78.202.62	10.78.202.63
17	10.78.202.64/30	10.78.202.65 – 10.78.202.66	10.78.202.67
18	10.78.202.68/30	10.78.202.69 – 10.78.202.70	10.78.202.71
19	10.78.202.72/30	10.78.202.73 – 10.78.202.74	10.78.202.75
20	10.78.202.76/30	10.78.202.77 – 10.78.202.78	10.78.202.79
21	10.78.202.80/30	10.78.202.81 – 10.78.202.82	10.78.202.83
22	10.78.202.84/30	10.78.202.85 – 10.78.202.86	10.78.202.87
23	10.78.202.88/30	10.78.202.89 – 10.78.202.90	10.78.202.91
24	10.78.202.92/30	10.78.202.93 – 10.78.202.94	10.78.202.95
25	10.78.202.96/30	10.78.202.97 – 10.78.202.98	10.78.202.99
26	10.78.202.100/30	10.78.202.101 – 10.78.202.102	10.78.202.103
27	10.78.202.104/30	10.78.202.105 – 10.78.202.106	10.78.202.107
28	10.78.202.108/30	10.78.202.109 – 10.78.202.110	10.78.202.111
29	10.78.202.112/30	10.78.202.113 – 10.78.202.114	10.78.202.115
30	10.78.202.116/30	10.78.202.117 – 10.78.202.118	10.78.202.119
31	10.78.202.120/30	10.78.202.121 – 10.78.202.122	10.78.202.123
32	10.78.202.124/30	10.78.202.125 – 10.78.202.126	10.78.202.127
33	10.78.202.128/30	10.78.202.129 – 10.78.202.130	10.78.202.131
34	10.78.202.132/30	10.78.202.133 – 10.78.202.134	10.78.202.135
35	10.78.202.136/30	10.78.202.137 – 10.78.202.138	10.78.202.139
36	10.78.202.140/30	10.78.202.141 – 10.78.202.142	10.78.202.143
37	10.78.202.144/30	10.78.202.145 – 10.78.202.146	10.78.202.147
38	10.78.202.148/30	10.78.202.149 – 10.78.202.150	10.78.202.151
39	10.78.202.152/30	10.78.202.153 – 10.78.202.154	10.78.202.155
40	10.78.202.156/30	10.78.202.157 – 10.78.202.158	10.78.202.159
41	10.78.202.160/30	10.78.202.161 – 10.78.202.162	10.78.202.163
42	10.78.202.164/30	10.78.202.165 – 10.78.202.166	10.78.202.167
43	10.78.202.168/30	10.78.202.169 – 10.78.202.170	10.78.202.171
44	10.78.202.172/30	10.78.202.173 – 10.78.202.174	10.78.202.175
45	10.78.202.176/30	10.78.202.177 – 10.78.202.178	10.78.202.179
46	10.78.202.180/30	10.78.202.181 – 10.78.202.182	10.78.202.183
47	10.78.202.184/30	10.78.202.185 – 10.78.202.186	10.78.202.187
48	10.78.202.188/30	10.78.202.189 – 10.78.202.190	10.78.202.191
49	10.78.202.192/30	10.78.202.193 – 10.78.202.194	10.78.202.195
50	10.78.202.196/30	10.78.202.197 – 10.78.202.198	10.78.202.199
51	10.78.202.200/30	10.78.202.201 – 10.78.202.202	10.78.202.203
52	10.78.202.204/30	10.78.202.205 – 10.78.202.206	10.78.202.207
53	10.78.202.208/30	10.78.202.209 – 10.78.202.210	10.78.202.211
54	10.78.202.212/30	10.78.202.213 – 10.78.202.214	10.78.202.215
55	10.78.202.216/30	10.78.202.217 – 10.78.202.218	10.78.202.219
56	10.78.202.220/30	10.78.202.221 – 10.78.202.222	10.78.202.223
57	10.78.202.224/30	10.78.202.225 – 10.78.202.226	10.78.202.227
58	10.78.202.228/30	10.78.202.229 – 10.78.202.230	10.78.202.231
59	10.78.202.232/30	10.78.202.233 – 10.78.202.234	10.78.202.235
60	10.78.202.236/30	10.78.202.237 – 10.78.202.238	10.78.202.239
61	10.78.202.240/30	10.78.202.241 – 10.78.202.242	10.78.202.243
62	10.78.202.244/30	10.78.202.245 – 10.78.202.246	10.78.202.247
63	10.78.202.248/30	10.78.202.249 – 10.78.202.250	10.78.202.251
64	10.78.202.252/30	10.78.202.253 – 10.78.202.254	10.78.202.255

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 →