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)10.6.67.0/24

network10.6.67.0/24

broadcast10.6.67.255

first host10.6.67.1

last host10.6.67.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.6.67.0/24

address00001010.00000110.01000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000110.01000011.00000000

broadcast00001010.00000110.01000011.11111111

green = network part, grey = host part

hex0x0a064300

decimal168182528

reverse dns0.67.6.10.in-addr.arpa

ipv4-mapped::ffff:a06:4300

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.6.67.0/30	10.6.67.1 – 10.6.67.2	10.6.67.3
2	10.6.67.4/30	10.6.67.5 – 10.6.67.6	10.6.67.7
3	10.6.67.8/30	10.6.67.9 – 10.6.67.10	10.6.67.11
4	10.6.67.12/30	10.6.67.13 – 10.6.67.14	10.6.67.15
5	10.6.67.16/30	10.6.67.17 – 10.6.67.18	10.6.67.19
6	10.6.67.20/30	10.6.67.21 – 10.6.67.22	10.6.67.23
7	10.6.67.24/30	10.6.67.25 – 10.6.67.26	10.6.67.27
8	10.6.67.28/30	10.6.67.29 – 10.6.67.30	10.6.67.31
9	10.6.67.32/30	10.6.67.33 – 10.6.67.34	10.6.67.35
10	10.6.67.36/30	10.6.67.37 – 10.6.67.38	10.6.67.39
11	10.6.67.40/30	10.6.67.41 – 10.6.67.42	10.6.67.43
12	10.6.67.44/30	10.6.67.45 – 10.6.67.46	10.6.67.47
13	10.6.67.48/30	10.6.67.49 – 10.6.67.50	10.6.67.51
14	10.6.67.52/30	10.6.67.53 – 10.6.67.54	10.6.67.55
15	10.6.67.56/30	10.6.67.57 – 10.6.67.58	10.6.67.59
16	10.6.67.60/30	10.6.67.61 – 10.6.67.62	10.6.67.63
17	10.6.67.64/30	10.6.67.65 – 10.6.67.66	10.6.67.67
18	10.6.67.68/30	10.6.67.69 – 10.6.67.70	10.6.67.71
19	10.6.67.72/30	10.6.67.73 – 10.6.67.74	10.6.67.75
20	10.6.67.76/30	10.6.67.77 – 10.6.67.78	10.6.67.79
21	10.6.67.80/30	10.6.67.81 – 10.6.67.82	10.6.67.83
22	10.6.67.84/30	10.6.67.85 – 10.6.67.86	10.6.67.87
23	10.6.67.88/30	10.6.67.89 – 10.6.67.90	10.6.67.91
24	10.6.67.92/30	10.6.67.93 – 10.6.67.94	10.6.67.95
25	10.6.67.96/30	10.6.67.97 – 10.6.67.98	10.6.67.99
26	10.6.67.100/30	10.6.67.101 – 10.6.67.102	10.6.67.103
27	10.6.67.104/30	10.6.67.105 – 10.6.67.106	10.6.67.107
28	10.6.67.108/30	10.6.67.109 – 10.6.67.110	10.6.67.111
29	10.6.67.112/30	10.6.67.113 – 10.6.67.114	10.6.67.115
30	10.6.67.116/30	10.6.67.117 – 10.6.67.118	10.6.67.119
31	10.6.67.120/30	10.6.67.121 – 10.6.67.122	10.6.67.123
32	10.6.67.124/30	10.6.67.125 – 10.6.67.126	10.6.67.127
33	10.6.67.128/30	10.6.67.129 – 10.6.67.130	10.6.67.131
34	10.6.67.132/30	10.6.67.133 – 10.6.67.134	10.6.67.135
35	10.6.67.136/30	10.6.67.137 – 10.6.67.138	10.6.67.139
36	10.6.67.140/30	10.6.67.141 – 10.6.67.142	10.6.67.143
37	10.6.67.144/30	10.6.67.145 – 10.6.67.146	10.6.67.147
38	10.6.67.148/30	10.6.67.149 – 10.6.67.150	10.6.67.151
39	10.6.67.152/30	10.6.67.153 – 10.6.67.154	10.6.67.155
40	10.6.67.156/30	10.6.67.157 – 10.6.67.158	10.6.67.159
41	10.6.67.160/30	10.6.67.161 – 10.6.67.162	10.6.67.163
42	10.6.67.164/30	10.6.67.165 – 10.6.67.166	10.6.67.167
43	10.6.67.168/30	10.6.67.169 – 10.6.67.170	10.6.67.171
44	10.6.67.172/30	10.6.67.173 – 10.6.67.174	10.6.67.175
45	10.6.67.176/30	10.6.67.177 – 10.6.67.178	10.6.67.179
46	10.6.67.180/30	10.6.67.181 – 10.6.67.182	10.6.67.183
47	10.6.67.184/30	10.6.67.185 – 10.6.67.186	10.6.67.187
48	10.6.67.188/30	10.6.67.189 – 10.6.67.190	10.6.67.191
49	10.6.67.192/30	10.6.67.193 – 10.6.67.194	10.6.67.195
50	10.6.67.196/30	10.6.67.197 – 10.6.67.198	10.6.67.199
51	10.6.67.200/30	10.6.67.201 – 10.6.67.202	10.6.67.203
52	10.6.67.204/30	10.6.67.205 – 10.6.67.206	10.6.67.207
53	10.6.67.208/30	10.6.67.209 – 10.6.67.210	10.6.67.211
54	10.6.67.212/30	10.6.67.213 – 10.6.67.214	10.6.67.215
55	10.6.67.216/30	10.6.67.217 – 10.6.67.218	10.6.67.219
56	10.6.67.220/30	10.6.67.221 – 10.6.67.222	10.6.67.223
57	10.6.67.224/30	10.6.67.225 – 10.6.67.226	10.6.67.227
58	10.6.67.228/30	10.6.67.229 – 10.6.67.230	10.6.67.231
59	10.6.67.232/30	10.6.67.233 – 10.6.67.234	10.6.67.235
60	10.6.67.236/30	10.6.67.237 – 10.6.67.238	10.6.67.239
61	10.6.67.240/30	10.6.67.241 – 10.6.67.242	10.6.67.243
62	10.6.67.244/30	10.6.67.245 – 10.6.67.246	10.6.67.247
63	10.6.67.248/30	10.6.67.249 – 10.6.67.250	10.6.67.251
64	10.6.67.252/30	10.6.67.253 – 10.6.67.254	10.6.67.255

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 →