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)10.166.69.0/24

network10.166.69.0/24

broadcast10.166.69.255

first host10.166.69.1

last host10.166.69.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.69.0/24

address00001010.10100110.01000101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.01000101.00000000

broadcast00001010.10100110.01000101.11111111

green = network part, grey = host part

hex0x0aa64500

decimal178668800

reverse dns0.69.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:4500

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.166.69.0/30	10.166.69.1 – 10.166.69.2	10.166.69.3
2	10.166.69.4/30	10.166.69.5 – 10.166.69.6	10.166.69.7
3	10.166.69.8/30	10.166.69.9 – 10.166.69.10	10.166.69.11
4	10.166.69.12/30	10.166.69.13 – 10.166.69.14	10.166.69.15
5	10.166.69.16/30	10.166.69.17 – 10.166.69.18	10.166.69.19
6	10.166.69.20/30	10.166.69.21 – 10.166.69.22	10.166.69.23
7	10.166.69.24/30	10.166.69.25 – 10.166.69.26	10.166.69.27
8	10.166.69.28/30	10.166.69.29 – 10.166.69.30	10.166.69.31
9	10.166.69.32/30	10.166.69.33 – 10.166.69.34	10.166.69.35
10	10.166.69.36/30	10.166.69.37 – 10.166.69.38	10.166.69.39
11	10.166.69.40/30	10.166.69.41 – 10.166.69.42	10.166.69.43
12	10.166.69.44/30	10.166.69.45 – 10.166.69.46	10.166.69.47
13	10.166.69.48/30	10.166.69.49 – 10.166.69.50	10.166.69.51
14	10.166.69.52/30	10.166.69.53 – 10.166.69.54	10.166.69.55
15	10.166.69.56/30	10.166.69.57 – 10.166.69.58	10.166.69.59
16	10.166.69.60/30	10.166.69.61 – 10.166.69.62	10.166.69.63
17	10.166.69.64/30	10.166.69.65 – 10.166.69.66	10.166.69.67
18	10.166.69.68/30	10.166.69.69 – 10.166.69.70	10.166.69.71
19	10.166.69.72/30	10.166.69.73 – 10.166.69.74	10.166.69.75
20	10.166.69.76/30	10.166.69.77 – 10.166.69.78	10.166.69.79
21	10.166.69.80/30	10.166.69.81 – 10.166.69.82	10.166.69.83
22	10.166.69.84/30	10.166.69.85 – 10.166.69.86	10.166.69.87
23	10.166.69.88/30	10.166.69.89 – 10.166.69.90	10.166.69.91
24	10.166.69.92/30	10.166.69.93 – 10.166.69.94	10.166.69.95
25	10.166.69.96/30	10.166.69.97 – 10.166.69.98	10.166.69.99
26	10.166.69.100/30	10.166.69.101 – 10.166.69.102	10.166.69.103
27	10.166.69.104/30	10.166.69.105 – 10.166.69.106	10.166.69.107
28	10.166.69.108/30	10.166.69.109 – 10.166.69.110	10.166.69.111
29	10.166.69.112/30	10.166.69.113 – 10.166.69.114	10.166.69.115
30	10.166.69.116/30	10.166.69.117 – 10.166.69.118	10.166.69.119
31	10.166.69.120/30	10.166.69.121 – 10.166.69.122	10.166.69.123
32	10.166.69.124/30	10.166.69.125 – 10.166.69.126	10.166.69.127
33	10.166.69.128/30	10.166.69.129 – 10.166.69.130	10.166.69.131
34	10.166.69.132/30	10.166.69.133 – 10.166.69.134	10.166.69.135
35	10.166.69.136/30	10.166.69.137 – 10.166.69.138	10.166.69.139
36	10.166.69.140/30	10.166.69.141 – 10.166.69.142	10.166.69.143
37	10.166.69.144/30	10.166.69.145 – 10.166.69.146	10.166.69.147
38	10.166.69.148/30	10.166.69.149 – 10.166.69.150	10.166.69.151
39	10.166.69.152/30	10.166.69.153 – 10.166.69.154	10.166.69.155
40	10.166.69.156/30	10.166.69.157 – 10.166.69.158	10.166.69.159
41	10.166.69.160/30	10.166.69.161 – 10.166.69.162	10.166.69.163
42	10.166.69.164/30	10.166.69.165 – 10.166.69.166	10.166.69.167
43	10.166.69.168/30	10.166.69.169 – 10.166.69.170	10.166.69.171
44	10.166.69.172/30	10.166.69.173 – 10.166.69.174	10.166.69.175
45	10.166.69.176/30	10.166.69.177 – 10.166.69.178	10.166.69.179
46	10.166.69.180/30	10.166.69.181 – 10.166.69.182	10.166.69.183
47	10.166.69.184/30	10.166.69.185 – 10.166.69.186	10.166.69.187
48	10.166.69.188/30	10.166.69.189 – 10.166.69.190	10.166.69.191
49	10.166.69.192/30	10.166.69.193 – 10.166.69.194	10.166.69.195
50	10.166.69.196/30	10.166.69.197 – 10.166.69.198	10.166.69.199
51	10.166.69.200/30	10.166.69.201 – 10.166.69.202	10.166.69.203
52	10.166.69.204/30	10.166.69.205 – 10.166.69.206	10.166.69.207
53	10.166.69.208/30	10.166.69.209 – 10.166.69.210	10.166.69.211
54	10.166.69.212/30	10.166.69.213 – 10.166.69.214	10.166.69.215
55	10.166.69.216/30	10.166.69.217 – 10.166.69.218	10.166.69.219
56	10.166.69.220/30	10.166.69.221 – 10.166.69.222	10.166.69.223
57	10.166.69.224/30	10.166.69.225 – 10.166.69.226	10.166.69.227
58	10.166.69.228/30	10.166.69.229 – 10.166.69.230	10.166.69.231
59	10.166.69.232/30	10.166.69.233 – 10.166.69.234	10.166.69.235
60	10.166.69.236/30	10.166.69.237 – 10.166.69.238	10.166.69.239
61	10.166.69.240/30	10.166.69.241 – 10.166.69.242	10.166.69.243
62	10.166.69.244/30	10.166.69.245 – 10.166.69.246	10.166.69.247
63	10.166.69.248/30	10.166.69.249 – 10.166.69.250	10.166.69.251
64	10.166.69.252/30	10.166.69.253 – 10.166.69.254	10.166.69.255

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 →