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)10.3.192.0/24

network10.3.192.0/24

broadcast10.3.192.255

first host10.3.192.1

last host10.3.192.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.192.0/24

address00001010.00000011.11000000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.11000000.00000000

broadcast00001010.00000011.11000000.11111111

green = network part, grey = host part

hex0x0a03c000

decimal168017920

reverse dns0.192.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c000

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/30	10.3.192.1 – 10.3.192.2	10.3.192.3
2	10.3.192.4/30	10.3.192.5 – 10.3.192.6	10.3.192.7
3	10.3.192.8/30	10.3.192.9 – 10.3.192.10	10.3.192.11
4	10.3.192.12/30	10.3.192.13 – 10.3.192.14	10.3.192.15
5	10.3.192.16/30	10.3.192.17 – 10.3.192.18	10.3.192.19
6	10.3.192.20/30	10.3.192.21 – 10.3.192.22	10.3.192.23
7	10.3.192.24/30	10.3.192.25 – 10.3.192.26	10.3.192.27
8	10.3.192.28/30	10.3.192.29 – 10.3.192.30	10.3.192.31
9	10.3.192.32/30	10.3.192.33 – 10.3.192.34	10.3.192.35
10	10.3.192.36/30	10.3.192.37 – 10.3.192.38	10.3.192.39
11	10.3.192.40/30	10.3.192.41 – 10.3.192.42	10.3.192.43
12	10.3.192.44/30	10.3.192.45 – 10.3.192.46	10.3.192.47
13	10.3.192.48/30	10.3.192.49 – 10.3.192.50	10.3.192.51
14	10.3.192.52/30	10.3.192.53 – 10.3.192.54	10.3.192.55
15	10.3.192.56/30	10.3.192.57 – 10.3.192.58	10.3.192.59
16	10.3.192.60/30	10.3.192.61 – 10.3.192.62	10.3.192.63
17	10.3.192.64/30	10.3.192.65 – 10.3.192.66	10.3.192.67
18	10.3.192.68/30	10.3.192.69 – 10.3.192.70	10.3.192.71
19	10.3.192.72/30	10.3.192.73 – 10.3.192.74	10.3.192.75
20	10.3.192.76/30	10.3.192.77 – 10.3.192.78	10.3.192.79
21	10.3.192.80/30	10.3.192.81 – 10.3.192.82	10.3.192.83
22	10.3.192.84/30	10.3.192.85 – 10.3.192.86	10.3.192.87
23	10.3.192.88/30	10.3.192.89 – 10.3.192.90	10.3.192.91
24	10.3.192.92/30	10.3.192.93 – 10.3.192.94	10.3.192.95
25	10.3.192.96/30	10.3.192.97 – 10.3.192.98	10.3.192.99
26	10.3.192.100/30	10.3.192.101 – 10.3.192.102	10.3.192.103
27	10.3.192.104/30	10.3.192.105 – 10.3.192.106	10.3.192.107
28	10.3.192.108/30	10.3.192.109 – 10.3.192.110	10.3.192.111
29	10.3.192.112/30	10.3.192.113 – 10.3.192.114	10.3.192.115
30	10.3.192.116/30	10.3.192.117 – 10.3.192.118	10.3.192.119
31	10.3.192.120/30	10.3.192.121 – 10.3.192.122	10.3.192.123
32	10.3.192.124/30	10.3.192.125 – 10.3.192.126	10.3.192.127
33	10.3.192.128/30	10.3.192.129 – 10.3.192.130	10.3.192.131
34	10.3.192.132/30	10.3.192.133 – 10.3.192.134	10.3.192.135
35	10.3.192.136/30	10.3.192.137 – 10.3.192.138	10.3.192.139
36	10.3.192.140/30	10.3.192.141 – 10.3.192.142	10.3.192.143
37	10.3.192.144/30	10.3.192.145 – 10.3.192.146	10.3.192.147
38	10.3.192.148/30	10.3.192.149 – 10.3.192.150	10.3.192.151
39	10.3.192.152/30	10.3.192.153 – 10.3.192.154	10.3.192.155
40	10.3.192.156/30	10.3.192.157 – 10.3.192.158	10.3.192.159
41	10.3.192.160/30	10.3.192.161 – 10.3.192.162	10.3.192.163
42	10.3.192.164/30	10.3.192.165 – 10.3.192.166	10.3.192.167
43	10.3.192.168/30	10.3.192.169 – 10.3.192.170	10.3.192.171
44	10.3.192.172/30	10.3.192.173 – 10.3.192.174	10.3.192.175
45	10.3.192.176/30	10.3.192.177 – 10.3.192.178	10.3.192.179
46	10.3.192.180/30	10.3.192.181 – 10.3.192.182	10.3.192.183
47	10.3.192.184/30	10.3.192.185 – 10.3.192.186	10.3.192.187
48	10.3.192.188/30	10.3.192.189 – 10.3.192.190	10.3.192.191
49	10.3.192.192/30	10.3.192.193 – 10.3.192.194	10.3.192.195
50	10.3.192.196/30	10.3.192.197 – 10.3.192.198	10.3.192.199
51	10.3.192.200/30	10.3.192.201 – 10.3.192.202	10.3.192.203
52	10.3.192.204/30	10.3.192.205 – 10.3.192.206	10.3.192.207
53	10.3.192.208/30	10.3.192.209 – 10.3.192.210	10.3.192.211
54	10.3.192.212/30	10.3.192.213 – 10.3.192.214	10.3.192.215
55	10.3.192.216/30	10.3.192.217 – 10.3.192.218	10.3.192.219
56	10.3.192.220/30	10.3.192.221 – 10.3.192.222	10.3.192.223
57	10.3.192.224/30	10.3.192.225 – 10.3.192.226	10.3.192.227
58	10.3.192.228/30	10.3.192.229 – 10.3.192.230	10.3.192.231
59	10.3.192.232/30	10.3.192.233 – 10.3.192.234	10.3.192.235
60	10.3.192.236/30	10.3.192.237 – 10.3.192.238	10.3.192.239
61	10.3.192.240/30	10.3.192.241 – 10.3.192.242	10.3.192.243
62	10.3.192.244/30	10.3.192.245 – 10.3.192.246	10.3.192.247
63	10.3.192.248/30	10.3.192.249 – 10.3.192.250	10.3.192.251
64	10.3.192.252/30	10.3.192.253 – 10.3.192.254	10.3.192.255

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 →