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)10.71.84.0/24

network10.71.84.0/24

broadcast10.71.84.255

first host10.71.84.1

last host10.71.84.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.71.84.0/24

address00001010.01000111.01010100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01000111.01010100.00000000

broadcast00001010.01000111.01010100.11111111

green = network part, grey = host part

hex0x0a475400

decimal172446720

reverse dns0.84.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:5400

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.71.84.0/30	10.71.84.1 – 10.71.84.2	10.71.84.3
2	10.71.84.4/30	10.71.84.5 – 10.71.84.6	10.71.84.7
3	10.71.84.8/30	10.71.84.9 – 10.71.84.10	10.71.84.11
4	10.71.84.12/30	10.71.84.13 – 10.71.84.14	10.71.84.15
5	10.71.84.16/30	10.71.84.17 – 10.71.84.18	10.71.84.19
6	10.71.84.20/30	10.71.84.21 – 10.71.84.22	10.71.84.23
7	10.71.84.24/30	10.71.84.25 – 10.71.84.26	10.71.84.27
8	10.71.84.28/30	10.71.84.29 – 10.71.84.30	10.71.84.31
9	10.71.84.32/30	10.71.84.33 – 10.71.84.34	10.71.84.35
10	10.71.84.36/30	10.71.84.37 – 10.71.84.38	10.71.84.39
11	10.71.84.40/30	10.71.84.41 – 10.71.84.42	10.71.84.43
12	10.71.84.44/30	10.71.84.45 – 10.71.84.46	10.71.84.47
13	10.71.84.48/30	10.71.84.49 – 10.71.84.50	10.71.84.51
14	10.71.84.52/30	10.71.84.53 – 10.71.84.54	10.71.84.55
15	10.71.84.56/30	10.71.84.57 – 10.71.84.58	10.71.84.59
16	10.71.84.60/30	10.71.84.61 – 10.71.84.62	10.71.84.63
17	10.71.84.64/30	10.71.84.65 – 10.71.84.66	10.71.84.67
18	10.71.84.68/30	10.71.84.69 – 10.71.84.70	10.71.84.71
19	10.71.84.72/30	10.71.84.73 – 10.71.84.74	10.71.84.75
20	10.71.84.76/30	10.71.84.77 – 10.71.84.78	10.71.84.79
21	10.71.84.80/30	10.71.84.81 – 10.71.84.82	10.71.84.83
22	10.71.84.84/30	10.71.84.85 – 10.71.84.86	10.71.84.87
23	10.71.84.88/30	10.71.84.89 – 10.71.84.90	10.71.84.91
24	10.71.84.92/30	10.71.84.93 – 10.71.84.94	10.71.84.95
25	10.71.84.96/30	10.71.84.97 – 10.71.84.98	10.71.84.99
26	10.71.84.100/30	10.71.84.101 – 10.71.84.102	10.71.84.103
27	10.71.84.104/30	10.71.84.105 – 10.71.84.106	10.71.84.107
28	10.71.84.108/30	10.71.84.109 – 10.71.84.110	10.71.84.111
29	10.71.84.112/30	10.71.84.113 – 10.71.84.114	10.71.84.115
30	10.71.84.116/30	10.71.84.117 – 10.71.84.118	10.71.84.119
31	10.71.84.120/30	10.71.84.121 – 10.71.84.122	10.71.84.123
32	10.71.84.124/30	10.71.84.125 – 10.71.84.126	10.71.84.127
33	10.71.84.128/30	10.71.84.129 – 10.71.84.130	10.71.84.131
34	10.71.84.132/30	10.71.84.133 – 10.71.84.134	10.71.84.135
35	10.71.84.136/30	10.71.84.137 – 10.71.84.138	10.71.84.139
36	10.71.84.140/30	10.71.84.141 – 10.71.84.142	10.71.84.143
37	10.71.84.144/30	10.71.84.145 – 10.71.84.146	10.71.84.147
38	10.71.84.148/30	10.71.84.149 – 10.71.84.150	10.71.84.151
39	10.71.84.152/30	10.71.84.153 – 10.71.84.154	10.71.84.155
40	10.71.84.156/30	10.71.84.157 – 10.71.84.158	10.71.84.159
41	10.71.84.160/30	10.71.84.161 – 10.71.84.162	10.71.84.163
42	10.71.84.164/30	10.71.84.165 – 10.71.84.166	10.71.84.167
43	10.71.84.168/30	10.71.84.169 – 10.71.84.170	10.71.84.171
44	10.71.84.172/30	10.71.84.173 – 10.71.84.174	10.71.84.175
45	10.71.84.176/30	10.71.84.177 – 10.71.84.178	10.71.84.179
46	10.71.84.180/30	10.71.84.181 – 10.71.84.182	10.71.84.183
47	10.71.84.184/30	10.71.84.185 – 10.71.84.186	10.71.84.187
48	10.71.84.188/30	10.71.84.189 – 10.71.84.190	10.71.84.191
49	10.71.84.192/30	10.71.84.193 – 10.71.84.194	10.71.84.195
50	10.71.84.196/30	10.71.84.197 – 10.71.84.198	10.71.84.199
51	10.71.84.200/30	10.71.84.201 – 10.71.84.202	10.71.84.203
52	10.71.84.204/30	10.71.84.205 – 10.71.84.206	10.71.84.207
53	10.71.84.208/30	10.71.84.209 – 10.71.84.210	10.71.84.211
54	10.71.84.212/30	10.71.84.213 – 10.71.84.214	10.71.84.215
55	10.71.84.216/30	10.71.84.217 – 10.71.84.218	10.71.84.219
56	10.71.84.220/30	10.71.84.221 – 10.71.84.222	10.71.84.223
57	10.71.84.224/30	10.71.84.225 – 10.71.84.226	10.71.84.227
58	10.71.84.228/30	10.71.84.229 – 10.71.84.230	10.71.84.231
59	10.71.84.232/30	10.71.84.233 – 10.71.84.234	10.71.84.235
60	10.71.84.236/30	10.71.84.237 – 10.71.84.238	10.71.84.239
61	10.71.84.240/30	10.71.84.241 – 10.71.84.242	10.71.84.243
62	10.71.84.244/30	10.71.84.245 – 10.71.84.246	10.71.84.247
63	10.71.84.248/30	10.71.84.249 – 10.71.84.250	10.71.84.251
64	10.71.84.252/30	10.71.84.253 – 10.71.84.254	10.71.84.255

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 →