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)10.2.143.0/24

network10.2.143.0/24

broadcast10.2.143.255

first host10.2.143.1

last host10.2.143.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.143.0/24

address00001010.00000010.10001111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10001111.00000000

broadcast00001010.00000010.10001111.11111111

green = network part, grey = host part

hex0x0a028f00

decimal167939840

reverse dns0.143.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8f00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.143.0/30	10.2.143.1 – 10.2.143.2	10.2.143.3
2	10.2.143.4/30	10.2.143.5 – 10.2.143.6	10.2.143.7
3	10.2.143.8/30	10.2.143.9 – 10.2.143.10	10.2.143.11
4	10.2.143.12/30	10.2.143.13 – 10.2.143.14	10.2.143.15
5	10.2.143.16/30	10.2.143.17 – 10.2.143.18	10.2.143.19
6	10.2.143.20/30	10.2.143.21 – 10.2.143.22	10.2.143.23
7	10.2.143.24/30	10.2.143.25 – 10.2.143.26	10.2.143.27
8	10.2.143.28/30	10.2.143.29 – 10.2.143.30	10.2.143.31
9	10.2.143.32/30	10.2.143.33 – 10.2.143.34	10.2.143.35
10	10.2.143.36/30	10.2.143.37 – 10.2.143.38	10.2.143.39
11	10.2.143.40/30	10.2.143.41 – 10.2.143.42	10.2.143.43
12	10.2.143.44/30	10.2.143.45 – 10.2.143.46	10.2.143.47
13	10.2.143.48/30	10.2.143.49 – 10.2.143.50	10.2.143.51
14	10.2.143.52/30	10.2.143.53 – 10.2.143.54	10.2.143.55
15	10.2.143.56/30	10.2.143.57 – 10.2.143.58	10.2.143.59
16	10.2.143.60/30	10.2.143.61 – 10.2.143.62	10.2.143.63
17	10.2.143.64/30	10.2.143.65 – 10.2.143.66	10.2.143.67
18	10.2.143.68/30	10.2.143.69 – 10.2.143.70	10.2.143.71
19	10.2.143.72/30	10.2.143.73 – 10.2.143.74	10.2.143.75
20	10.2.143.76/30	10.2.143.77 – 10.2.143.78	10.2.143.79
21	10.2.143.80/30	10.2.143.81 – 10.2.143.82	10.2.143.83
22	10.2.143.84/30	10.2.143.85 – 10.2.143.86	10.2.143.87
23	10.2.143.88/30	10.2.143.89 – 10.2.143.90	10.2.143.91
24	10.2.143.92/30	10.2.143.93 – 10.2.143.94	10.2.143.95
25	10.2.143.96/30	10.2.143.97 – 10.2.143.98	10.2.143.99
26	10.2.143.100/30	10.2.143.101 – 10.2.143.102	10.2.143.103
27	10.2.143.104/30	10.2.143.105 – 10.2.143.106	10.2.143.107
28	10.2.143.108/30	10.2.143.109 – 10.2.143.110	10.2.143.111
29	10.2.143.112/30	10.2.143.113 – 10.2.143.114	10.2.143.115
30	10.2.143.116/30	10.2.143.117 – 10.2.143.118	10.2.143.119
31	10.2.143.120/30	10.2.143.121 – 10.2.143.122	10.2.143.123
32	10.2.143.124/30	10.2.143.125 – 10.2.143.126	10.2.143.127
33	10.2.143.128/30	10.2.143.129 – 10.2.143.130	10.2.143.131
34	10.2.143.132/30	10.2.143.133 – 10.2.143.134	10.2.143.135
35	10.2.143.136/30	10.2.143.137 – 10.2.143.138	10.2.143.139
36	10.2.143.140/30	10.2.143.141 – 10.2.143.142	10.2.143.143
37	10.2.143.144/30	10.2.143.145 – 10.2.143.146	10.2.143.147
38	10.2.143.148/30	10.2.143.149 – 10.2.143.150	10.2.143.151
39	10.2.143.152/30	10.2.143.153 – 10.2.143.154	10.2.143.155
40	10.2.143.156/30	10.2.143.157 – 10.2.143.158	10.2.143.159
41	10.2.143.160/30	10.2.143.161 – 10.2.143.162	10.2.143.163
42	10.2.143.164/30	10.2.143.165 – 10.2.143.166	10.2.143.167
43	10.2.143.168/30	10.2.143.169 – 10.2.143.170	10.2.143.171
44	10.2.143.172/30	10.2.143.173 – 10.2.143.174	10.2.143.175
45	10.2.143.176/30	10.2.143.177 – 10.2.143.178	10.2.143.179
46	10.2.143.180/30	10.2.143.181 – 10.2.143.182	10.2.143.183
47	10.2.143.184/30	10.2.143.185 – 10.2.143.186	10.2.143.187
48	10.2.143.188/30	10.2.143.189 – 10.2.143.190	10.2.143.191
49	10.2.143.192/30	10.2.143.193 – 10.2.143.194	10.2.143.195
50	10.2.143.196/30	10.2.143.197 – 10.2.143.198	10.2.143.199
51	10.2.143.200/30	10.2.143.201 – 10.2.143.202	10.2.143.203
52	10.2.143.204/30	10.2.143.205 – 10.2.143.206	10.2.143.207
53	10.2.143.208/30	10.2.143.209 – 10.2.143.210	10.2.143.211
54	10.2.143.212/30	10.2.143.213 – 10.2.143.214	10.2.143.215
55	10.2.143.216/30	10.2.143.217 – 10.2.143.218	10.2.143.219
56	10.2.143.220/30	10.2.143.221 – 10.2.143.222	10.2.143.223
57	10.2.143.224/30	10.2.143.225 – 10.2.143.226	10.2.143.227
58	10.2.143.228/30	10.2.143.229 – 10.2.143.230	10.2.143.231
59	10.2.143.232/30	10.2.143.233 – 10.2.143.234	10.2.143.235
60	10.2.143.236/30	10.2.143.237 – 10.2.143.238	10.2.143.239
61	10.2.143.240/30	10.2.143.241 – 10.2.143.242	10.2.143.243
62	10.2.143.244/30	10.2.143.245 – 10.2.143.246	10.2.143.247
63	10.2.143.248/30	10.2.143.249 – 10.2.143.250	10.2.143.251
64	10.2.143.252/30	10.2.143.253 – 10.2.143.254	10.2.143.255

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 →