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)10.2.141.0/24

network10.2.141.0/24

broadcast10.2.141.255

first host10.2.141.1

last host10.2.141.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.141.0/24

address00001010.00000010.10001101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10001101.00000000

broadcast00001010.00000010.10001101.11111111

green = network part, grey = host part

hex0x0a028d00

decimal167939328

reverse dns0.141.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8d00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.141.0/30	10.2.141.1 – 10.2.141.2	10.2.141.3
2	10.2.141.4/30	10.2.141.5 – 10.2.141.6	10.2.141.7
3	10.2.141.8/30	10.2.141.9 – 10.2.141.10	10.2.141.11
4	10.2.141.12/30	10.2.141.13 – 10.2.141.14	10.2.141.15
5	10.2.141.16/30	10.2.141.17 – 10.2.141.18	10.2.141.19
6	10.2.141.20/30	10.2.141.21 – 10.2.141.22	10.2.141.23
7	10.2.141.24/30	10.2.141.25 – 10.2.141.26	10.2.141.27
8	10.2.141.28/30	10.2.141.29 – 10.2.141.30	10.2.141.31
9	10.2.141.32/30	10.2.141.33 – 10.2.141.34	10.2.141.35
10	10.2.141.36/30	10.2.141.37 – 10.2.141.38	10.2.141.39
11	10.2.141.40/30	10.2.141.41 – 10.2.141.42	10.2.141.43
12	10.2.141.44/30	10.2.141.45 – 10.2.141.46	10.2.141.47
13	10.2.141.48/30	10.2.141.49 – 10.2.141.50	10.2.141.51
14	10.2.141.52/30	10.2.141.53 – 10.2.141.54	10.2.141.55
15	10.2.141.56/30	10.2.141.57 – 10.2.141.58	10.2.141.59
16	10.2.141.60/30	10.2.141.61 – 10.2.141.62	10.2.141.63
17	10.2.141.64/30	10.2.141.65 – 10.2.141.66	10.2.141.67
18	10.2.141.68/30	10.2.141.69 – 10.2.141.70	10.2.141.71
19	10.2.141.72/30	10.2.141.73 – 10.2.141.74	10.2.141.75
20	10.2.141.76/30	10.2.141.77 – 10.2.141.78	10.2.141.79
21	10.2.141.80/30	10.2.141.81 – 10.2.141.82	10.2.141.83
22	10.2.141.84/30	10.2.141.85 – 10.2.141.86	10.2.141.87
23	10.2.141.88/30	10.2.141.89 – 10.2.141.90	10.2.141.91
24	10.2.141.92/30	10.2.141.93 – 10.2.141.94	10.2.141.95
25	10.2.141.96/30	10.2.141.97 – 10.2.141.98	10.2.141.99
26	10.2.141.100/30	10.2.141.101 – 10.2.141.102	10.2.141.103
27	10.2.141.104/30	10.2.141.105 – 10.2.141.106	10.2.141.107
28	10.2.141.108/30	10.2.141.109 – 10.2.141.110	10.2.141.111
29	10.2.141.112/30	10.2.141.113 – 10.2.141.114	10.2.141.115
30	10.2.141.116/30	10.2.141.117 – 10.2.141.118	10.2.141.119
31	10.2.141.120/30	10.2.141.121 – 10.2.141.122	10.2.141.123
32	10.2.141.124/30	10.2.141.125 – 10.2.141.126	10.2.141.127
33	10.2.141.128/30	10.2.141.129 – 10.2.141.130	10.2.141.131
34	10.2.141.132/30	10.2.141.133 – 10.2.141.134	10.2.141.135
35	10.2.141.136/30	10.2.141.137 – 10.2.141.138	10.2.141.139
36	10.2.141.140/30	10.2.141.141 – 10.2.141.142	10.2.141.143
37	10.2.141.144/30	10.2.141.145 – 10.2.141.146	10.2.141.147
38	10.2.141.148/30	10.2.141.149 – 10.2.141.150	10.2.141.151
39	10.2.141.152/30	10.2.141.153 – 10.2.141.154	10.2.141.155
40	10.2.141.156/30	10.2.141.157 – 10.2.141.158	10.2.141.159
41	10.2.141.160/30	10.2.141.161 – 10.2.141.162	10.2.141.163
42	10.2.141.164/30	10.2.141.165 – 10.2.141.166	10.2.141.167
43	10.2.141.168/30	10.2.141.169 – 10.2.141.170	10.2.141.171
44	10.2.141.172/30	10.2.141.173 – 10.2.141.174	10.2.141.175
45	10.2.141.176/30	10.2.141.177 – 10.2.141.178	10.2.141.179
46	10.2.141.180/30	10.2.141.181 – 10.2.141.182	10.2.141.183
47	10.2.141.184/30	10.2.141.185 – 10.2.141.186	10.2.141.187
48	10.2.141.188/30	10.2.141.189 – 10.2.141.190	10.2.141.191
49	10.2.141.192/30	10.2.141.193 – 10.2.141.194	10.2.141.195
50	10.2.141.196/30	10.2.141.197 – 10.2.141.198	10.2.141.199
51	10.2.141.200/30	10.2.141.201 – 10.2.141.202	10.2.141.203
52	10.2.141.204/30	10.2.141.205 – 10.2.141.206	10.2.141.207
53	10.2.141.208/30	10.2.141.209 – 10.2.141.210	10.2.141.211
54	10.2.141.212/30	10.2.141.213 – 10.2.141.214	10.2.141.215
55	10.2.141.216/30	10.2.141.217 – 10.2.141.218	10.2.141.219
56	10.2.141.220/30	10.2.141.221 – 10.2.141.222	10.2.141.223
57	10.2.141.224/30	10.2.141.225 – 10.2.141.226	10.2.141.227
58	10.2.141.228/30	10.2.141.229 – 10.2.141.230	10.2.141.231
59	10.2.141.232/30	10.2.141.233 – 10.2.141.234	10.2.141.235
60	10.2.141.236/30	10.2.141.237 – 10.2.141.238	10.2.141.239
61	10.2.141.240/30	10.2.141.241 – 10.2.141.242	10.2.141.243
62	10.2.141.244/30	10.2.141.245 – 10.2.141.246	10.2.141.247
63	10.2.141.248/30	10.2.141.249 – 10.2.141.250	10.2.141.251
64	10.2.141.252/30	10.2.141.253 – 10.2.141.254	10.2.141.255

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 →