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)10.3.186.0/24

network10.3.186.0/24

broadcast10.3.186.255

first host10.3.186.1

last host10.3.186.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.186.0/24

address00001010.00000011.10111010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.10111010.00000000

broadcast00001010.00000011.10111010.11111111

green = network part, grey = host part

hex0x0a03ba00

decimal168016384

reverse dns0.186.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:ba00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.186.0/30	10.3.186.1 – 10.3.186.2	10.3.186.3
2	10.3.186.4/30	10.3.186.5 – 10.3.186.6	10.3.186.7
3	10.3.186.8/30	10.3.186.9 – 10.3.186.10	10.3.186.11
4	10.3.186.12/30	10.3.186.13 – 10.3.186.14	10.3.186.15
5	10.3.186.16/30	10.3.186.17 – 10.3.186.18	10.3.186.19
6	10.3.186.20/30	10.3.186.21 – 10.3.186.22	10.3.186.23
7	10.3.186.24/30	10.3.186.25 – 10.3.186.26	10.3.186.27
8	10.3.186.28/30	10.3.186.29 – 10.3.186.30	10.3.186.31
9	10.3.186.32/30	10.3.186.33 – 10.3.186.34	10.3.186.35
10	10.3.186.36/30	10.3.186.37 – 10.3.186.38	10.3.186.39
11	10.3.186.40/30	10.3.186.41 – 10.3.186.42	10.3.186.43
12	10.3.186.44/30	10.3.186.45 – 10.3.186.46	10.3.186.47
13	10.3.186.48/30	10.3.186.49 – 10.3.186.50	10.3.186.51
14	10.3.186.52/30	10.3.186.53 – 10.3.186.54	10.3.186.55
15	10.3.186.56/30	10.3.186.57 – 10.3.186.58	10.3.186.59
16	10.3.186.60/30	10.3.186.61 – 10.3.186.62	10.3.186.63
17	10.3.186.64/30	10.3.186.65 – 10.3.186.66	10.3.186.67
18	10.3.186.68/30	10.3.186.69 – 10.3.186.70	10.3.186.71
19	10.3.186.72/30	10.3.186.73 – 10.3.186.74	10.3.186.75
20	10.3.186.76/30	10.3.186.77 – 10.3.186.78	10.3.186.79
21	10.3.186.80/30	10.3.186.81 – 10.3.186.82	10.3.186.83
22	10.3.186.84/30	10.3.186.85 – 10.3.186.86	10.3.186.87
23	10.3.186.88/30	10.3.186.89 – 10.3.186.90	10.3.186.91
24	10.3.186.92/30	10.3.186.93 – 10.3.186.94	10.3.186.95
25	10.3.186.96/30	10.3.186.97 – 10.3.186.98	10.3.186.99
26	10.3.186.100/30	10.3.186.101 – 10.3.186.102	10.3.186.103
27	10.3.186.104/30	10.3.186.105 – 10.3.186.106	10.3.186.107
28	10.3.186.108/30	10.3.186.109 – 10.3.186.110	10.3.186.111
29	10.3.186.112/30	10.3.186.113 – 10.3.186.114	10.3.186.115
30	10.3.186.116/30	10.3.186.117 – 10.3.186.118	10.3.186.119
31	10.3.186.120/30	10.3.186.121 – 10.3.186.122	10.3.186.123
32	10.3.186.124/30	10.3.186.125 – 10.3.186.126	10.3.186.127
33	10.3.186.128/30	10.3.186.129 – 10.3.186.130	10.3.186.131
34	10.3.186.132/30	10.3.186.133 – 10.3.186.134	10.3.186.135
35	10.3.186.136/30	10.3.186.137 – 10.3.186.138	10.3.186.139
36	10.3.186.140/30	10.3.186.141 – 10.3.186.142	10.3.186.143
37	10.3.186.144/30	10.3.186.145 – 10.3.186.146	10.3.186.147
38	10.3.186.148/30	10.3.186.149 – 10.3.186.150	10.3.186.151
39	10.3.186.152/30	10.3.186.153 – 10.3.186.154	10.3.186.155
40	10.3.186.156/30	10.3.186.157 – 10.3.186.158	10.3.186.159
41	10.3.186.160/30	10.3.186.161 – 10.3.186.162	10.3.186.163
42	10.3.186.164/30	10.3.186.165 – 10.3.186.166	10.3.186.167
43	10.3.186.168/30	10.3.186.169 – 10.3.186.170	10.3.186.171
44	10.3.186.172/30	10.3.186.173 – 10.3.186.174	10.3.186.175
45	10.3.186.176/30	10.3.186.177 – 10.3.186.178	10.3.186.179
46	10.3.186.180/30	10.3.186.181 – 10.3.186.182	10.3.186.183
47	10.3.186.184/30	10.3.186.185 – 10.3.186.186	10.3.186.187
48	10.3.186.188/30	10.3.186.189 – 10.3.186.190	10.3.186.191
49	10.3.186.192/30	10.3.186.193 – 10.3.186.194	10.3.186.195
50	10.3.186.196/30	10.3.186.197 – 10.3.186.198	10.3.186.199
51	10.3.186.200/30	10.3.186.201 – 10.3.186.202	10.3.186.203
52	10.3.186.204/30	10.3.186.205 – 10.3.186.206	10.3.186.207
53	10.3.186.208/30	10.3.186.209 – 10.3.186.210	10.3.186.211
54	10.3.186.212/30	10.3.186.213 – 10.3.186.214	10.3.186.215
55	10.3.186.216/30	10.3.186.217 – 10.3.186.218	10.3.186.219
56	10.3.186.220/30	10.3.186.221 – 10.3.186.222	10.3.186.223
57	10.3.186.224/30	10.3.186.225 – 10.3.186.226	10.3.186.227
58	10.3.186.228/30	10.3.186.229 – 10.3.186.230	10.3.186.231
59	10.3.186.232/30	10.3.186.233 – 10.3.186.234	10.3.186.235
60	10.3.186.236/30	10.3.186.237 – 10.3.186.238	10.3.186.239
61	10.3.186.240/30	10.3.186.241 – 10.3.186.242	10.3.186.243
62	10.3.186.244/30	10.3.186.245 – 10.3.186.246	10.3.186.247
63	10.3.186.248/30	10.3.186.249 – 10.3.186.250	10.3.186.251
64	10.3.186.252/30	10.3.186.253 – 10.3.186.254	10.3.186.255

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 →