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)10.3.147.0/24

network10.3.147.0/24

broadcast10.3.147.255

first host10.3.147.1

last host10.3.147.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.147.0/24

address00001010.00000011.10010011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.10010011.00000000

broadcast00001010.00000011.10010011.11111111

green = network part, grey = host part

hex0x0a039300

decimal168006400

reverse dns0.147.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9300

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.147.0/30	10.3.147.1 – 10.3.147.2	10.3.147.3
2	10.3.147.4/30	10.3.147.5 – 10.3.147.6	10.3.147.7
3	10.3.147.8/30	10.3.147.9 – 10.3.147.10	10.3.147.11
4	10.3.147.12/30	10.3.147.13 – 10.3.147.14	10.3.147.15
5	10.3.147.16/30	10.3.147.17 – 10.3.147.18	10.3.147.19
6	10.3.147.20/30	10.3.147.21 – 10.3.147.22	10.3.147.23
7	10.3.147.24/30	10.3.147.25 – 10.3.147.26	10.3.147.27
8	10.3.147.28/30	10.3.147.29 – 10.3.147.30	10.3.147.31
9	10.3.147.32/30	10.3.147.33 – 10.3.147.34	10.3.147.35
10	10.3.147.36/30	10.3.147.37 – 10.3.147.38	10.3.147.39
11	10.3.147.40/30	10.3.147.41 – 10.3.147.42	10.3.147.43
12	10.3.147.44/30	10.3.147.45 – 10.3.147.46	10.3.147.47
13	10.3.147.48/30	10.3.147.49 – 10.3.147.50	10.3.147.51
14	10.3.147.52/30	10.3.147.53 – 10.3.147.54	10.3.147.55
15	10.3.147.56/30	10.3.147.57 – 10.3.147.58	10.3.147.59
16	10.3.147.60/30	10.3.147.61 – 10.3.147.62	10.3.147.63
17	10.3.147.64/30	10.3.147.65 – 10.3.147.66	10.3.147.67
18	10.3.147.68/30	10.3.147.69 – 10.3.147.70	10.3.147.71
19	10.3.147.72/30	10.3.147.73 – 10.3.147.74	10.3.147.75
20	10.3.147.76/30	10.3.147.77 – 10.3.147.78	10.3.147.79
21	10.3.147.80/30	10.3.147.81 – 10.3.147.82	10.3.147.83
22	10.3.147.84/30	10.3.147.85 – 10.3.147.86	10.3.147.87
23	10.3.147.88/30	10.3.147.89 – 10.3.147.90	10.3.147.91
24	10.3.147.92/30	10.3.147.93 – 10.3.147.94	10.3.147.95
25	10.3.147.96/30	10.3.147.97 – 10.3.147.98	10.3.147.99
26	10.3.147.100/30	10.3.147.101 – 10.3.147.102	10.3.147.103
27	10.3.147.104/30	10.3.147.105 – 10.3.147.106	10.3.147.107
28	10.3.147.108/30	10.3.147.109 – 10.3.147.110	10.3.147.111
29	10.3.147.112/30	10.3.147.113 – 10.3.147.114	10.3.147.115
30	10.3.147.116/30	10.3.147.117 – 10.3.147.118	10.3.147.119
31	10.3.147.120/30	10.3.147.121 – 10.3.147.122	10.3.147.123
32	10.3.147.124/30	10.3.147.125 – 10.3.147.126	10.3.147.127
33	10.3.147.128/30	10.3.147.129 – 10.3.147.130	10.3.147.131
34	10.3.147.132/30	10.3.147.133 – 10.3.147.134	10.3.147.135
35	10.3.147.136/30	10.3.147.137 – 10.3.147.138	10.3.147.139
36	10.3.147.140/30	10.3.147.141 – 10.3.147.142	10.3.147.143
37	10.3.147.144/30	10.3.147.145 – 10.3.147.146	10.3.147.147
38	10.3.147.148/30	10.3.147.149 – 10.3.147.150	10.3.147.151
39	10.3.147.152/30	10.3.147.153 – 10.3.147.154	10.3.147.155
40	10.3.147.156/30	10.3.147.157 – 10.3.147.158	10.3.147.159
41	10.3.147.160/30	10.3.147.161 – 10.3.147.162	10.3.147.163
42	10.3.147.164/30	10.3.147.165 – 10.3.147.166	10.3.147.167
43	10.3.147.168/30	10.3.147.169 – 10.3.147.170	10.3.147.171
44	10.3.147.172/30	10.3.147.173 – 10.3.147.174	10.3.147.175
45	10.3.147.176/30	10.3.147.177 – 10.3.147.178	10.3.147.179
46	10.3.147.180/30	10.3.147.181 – 10.3.147.182	10.3.147.183
47	10.3.147.184/30	10.3.147.185 – 10.3.147.186	10.3.147.187
48	10.3.147.188/30	10.3.147.189 – 10.3.147.190	10.3.147.191
49	10.3.147.192/30	10.3.147.193 – 10.3.147.194	10.3.147.195
50	10.3.147.196/30	10.3.147.197 – 10.3.147.198	10.3.147.199
51	10.3.147.200/30	10.3.147.201 – 10.3.147.202	10.3.147.203
52	10.3.147.204/30	10.3.147.205 – 10.3.147.206	10.3.147.207
53	10.3.147.208/30	10.3.147.209 – 10.3.147.210	10.3.147.211
54	10.3.147.212/30	10.3.147.213 – 10.3.147.214	10.3.147.215
55	10.3.147.216/30	10.3.147.217 – 10.3.147.218	10.3.147.219
56	10.3.147.220/30	10.3.147.221 – 10.3.147.222	10.3.147.223
57	10.3.147.224/30	10.3.147.225 – 10.3.147.226	10.3.147.227
58	10.3.147.228/30	10.3.147.229 – 10.3.147.230	10.3.147.231
59	10.3.147.232/30	10.3.147.233 – 10.3.147.234	10.3.147.235
60	10.3.147.236/30	10.3.147.237 – 10.3.147.238	10.3.147.239
61	10.3.147.240/30	10.3.147.241 – 10.3.147.242	10.3.147.243
62	10.3.147.244/30	10.3.147.245 – 10.3.147.246	10.3.147.247
63	10.3.147.248/30	10.3.147.249 – 10.3.147.250	10.3.147.251
64	10.3.147.252/30	10.3.147.253 – 10.3.147.254	10.3.147.255

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 →