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)10.5.6.0/24

network10.5.6.0/24

broadcast10.5.6.255

first host10.5.6.1

last host10.5.6.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.5.6.0/24

address00001010.00000101.00000110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000101.00000110.00000000

broadcast00001010.00000101.00000110.11111111

green = network part, grey = host part

hex0x0a050600

decimal168101376

reverse dns0.6.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:600

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.5.6.0/30	10.5.6.1 – 10.5.6.2	10.5.6.3
2	10.5.6.4/30	10.5.6.5 – 10.5.6.6	10.5.6.7
3	10.5.6.8/30	10.5.6.9 – 10.5.6.10	10.5.6.11
4	10.5.6.12/30	10.5.6.13 – 10.5.6.14	10.5.6.15
5	10.5.6.16/30	10.5.6.17 – 10.5.6.18	10.5.6.19
6	10.5.6.20/30	10.5.6.21 – 10.5.6.22	10.5.6.23
7	10.5.6.24/30	10.5.6.25 – 10.5.6.26	10.5.6.27
8	10.5.6.28/30	10.5.6.29 – 10.5.6.30	10.5.6.31
9	10.5.6.32/30	10.5.6.33 – 10.5.6.34	10.5.6.35
10	10.5.6.36/30	10.5.6.37 – 10.5.6.38	10.5.6.39
11	10.5.6.40/30	10.5.6.41 – 10.5.6.42	10.5.6.43
12	10.5.6.44/30	10.5.6.45 – 10.5.6.46	10.5.6.47
13	10.5.6.48/30	10.5.6.49 – 10.5.6.50	10.5.6.51
14	10.5.6.52/30	10.5.6.53 – 10.5.6.54	10.5.6.55
15	10.5.6.56/30	10.5.6.57 – 10.5.6.58	10.5.6.59
16	10.5.6.60/30	10.5.6.61 – 10.5.6.62	10.5.6.63
17	10.5.6.64/30	10.5.6.65 – 10.5.6.66	10.5.6.67
18	10.5.6.68/30	10.5.6.69 – 10.5.6.70	10.5.6.71
19	10.5.6.72/30	10.5.6.73 – 10.5.6.74	10.5.6.75
20	10.5.6.76/30	10.5.6.77 – 10.5.6.78	10.5.6.79
21	10.5.6.80/30	10.5.6.81 – 10.5.6.82	10.5.6.83
22	10.5.6.84/30	10.5.6.85 – 10.5.6.86	10.5.6.87
23	10.5.6.88/30	10.5.6.89 – 10.5.6.90	10.5.6.91
24	10.5.6.92/30	10.5.6.93 – 10.5.6.94	10.5.6.95
25	10.5.6.96/30	10.5.6.97 – 10.5.6.98	10.5.6.99
26	10.5.6.100/30	10.5.6.101 – 10.5.6.102	10.5.6.103
27	10.5.6.104/30	10.5.6.105 – 10.5.6.106	10.5.6.107
28	10.5.6.108/30	10.5.6.109 – 10.5.6.110	10.5.6.111
29	10.5.6.112/30	10.5.6.113 – 10.5.6.114	10.5.6.115
30	10.5.6.116/30	10.5.6.117 – 10.5.6.118	10.5.6.119
31	10.5.6.120/30	10.5.6.121 – 10.5.6.122	10.5.6.123
32	10.5.6.124/30	10.5.6.125 – 10.5.6.126	10.5.6.127
33	10.5.6.128/30	10.5.6.129 – 10.5.6.130	10.5.6.131
34	10.5.6.132/30	10.5.6.133 – 10.5.6.134	10.5.6.135
35	10.5.6.136/30	10.5.6.137 – 10.5.6.138	10.5.6.139
36	10.5.6.140/30	10.5.6.141 – 10.5.6.142	10.5.6.143
37	10.5.6.144/30	10.5.6.145 – 10.5.6.146	10.5.6.147
38	10.5.6.148/30	10.5.6.149 – 10.5.6.150	10.5.6.151
39	10.5.6.152/30	10.5.6.153 – 10.5.6.154	10.5.6.155
40	10.5.6.156/30	10.5.6.157 – 10.5.6.158	10.5.6.159
41	10.5.6.160/30	10.5.6.161 – 10.5.6.162	10.5.6.163
42	10.5.6.164/30	10.5.6.165 – 10.5.6.166	10.5.6.167
43	10.5.6.168/30	10.5.6.169 – 10.5.6.170	10.5.6.171
44	10.5.6.172/30	10.5.6.173 – 10.5.6.174	10.5.6.175
45	10.5.6.176/30	10.5.6.177 – 10.5.6.178	10.5.6.179
46	10.5.6.180/30	10.5.6.181 – 10.5.6.182	10.5.6.183
47	10.5.6.184/30	10.5.6.185 – 10.5.6.186	10.5.6.187
48	10.5.6.188/30	10.5.6.189 – 10.5.6.190	10.5.6.191
49	10.5.6.192/30	10.5.6.193 – 10.5.6.194	10.5.6.195
50	10.5.6.196/30	10.5.6.197 – 10.5.6.198	10.5.6.199
51	10.5.6.200/30	10.5.6.201 – 10.5.6.202	10.5.6.203
52	10.5.6.204/30	10.5.6.205 – 10.5.6.206	10.5.6.207
53	10.5.6.208/30	10.5.6.209 – 10.5.6.210	10.5.6.211
54	10.5.6.212/30	10.5.6.213 – 10.5.6.214	10.5.6.215
55	10.5.6.216/30	10.5.6.217 – 10.5.6.218	10.5.6.219
56	10.5.6.220/30	10.5.6.221 – 10.5.6.222	10.5.6.223
57	10.5.6.224/30	10.5.6.225 – 10.5.6.226	10.5.6.227
58	10.5.6.228/30	10.5.6.229 – 10.5.6.230	10.5.6.231
59	10.5.6.232/30	10.5.6.233 – 10.5.6.234	10.5.6.235
60	10.5.6.236/30	10.5.6.237 – 10.5.6.238	10.5.6.239
61	10.5.6.240/30	10.5.6.241 – 10.5.6.242	10.5.6.243
62	10.5.6.244/30	10.5.6.245 – 10.5.6.246	10.5.6.247
63	10.5.6.248/30	10.5.6.249 – 10.5.6.250	10.5.6.251
64	10.5.6.252/30	10.5.6.253 – 10.5.6.254	10.5.6.255

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 →