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)10.2.4.0/24

network10.2.4.0/24

broadcast10.2.4.255

first host10.2.4.1

last host10.2.4.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.4.0/24

address00001010.00000010.00000100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.00000100.00000000

broadcast00001010.00000010.00000100.11111111

green = network part, grey = host part

hex0x0a020400

decimal167904256

reverse dns0.4.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:400

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.4.0/30	10.2.4.1 – 10.2.4.2	10.2.4.3
2	10.2.4.4/30	10.2.4.5 – 10.2.4.6	10.2.4.7
3	10.2.4.8/30	10.2.4.9 – 10.2.4.10	10.2.4.11
4	10.2.4.12/30	10.2.4.13 – 10.2.4.14	10.2.4.15
5	10.2.4.16/30	10.2.4.17 – 10.2.4.18	10.2.4.19
6	10.2.4.20/30	10.2.4.21 – 10.2.4.22	10.2.4.23
7	10.2.4.24/30	10.2.4.25 – 10.2.4.26	10.2.4.27
8	10.2.4.28/30	10.2.4.29 – 10.2.4.30	10.2.4.31
9	10.2.4.32/30	10.2.4.33 – 10.2.4.34	10.2.4.35
10	10.2.4.36/30	10.2.4.37 – 10.2.4.38	10.2.4.39
11	10.2.4.40/30	10.2.4.41 – 10.2.4.42	10.2.4.43
12	10.2.4.44/30	10.2.4.45 – 10.2.4.46	10.2.4.47
13	10.2.4.48/30	10.2.4.49 – 10.2.4.50	10.2.4.51
14	10.2.4.52/30	10.2.4.53 – 10.2.4.54	10.2.4.55
15	10.2.4.56/30	10.2.4.57 – 10.2.4.58	10.2.4.59
16	10.2.4.60/30	10.2.4.61 – 10.2.4.62	10.2.4.63
17	10.2.4.64/30	10.2.4.65 – 10.2.4.66	10.2.4.67
18	10.2.4.68/30	10.2.4.69 – 10.2.4.70	10.2.4.71
19	10.2.4.72/30	10.2.4.73 – 10.2.4.74	10.2.4.75
20	10.2.4.76/30	10.2.4.77 – 10.2.4.78	10.2.4.79
21	10.2.4.80/30	10.2.4.81 – 10.2.4.82	10.2.4.83
22	10.2.4.84/30	10.2.4.85 – 10.2.4.86	10.2.4.87
23	10.2.4.88/30	10.2.4.89 – 10.2.4.90	10.2.4.91
24	10.2.4.92/30	10.2.4.93 – 10.2.4.94	10.2.4.95
25	10.2.4.96/30	10.2.4.97 – 10.2.4.98	10.2.4.99
26	10.2.4.100/30	10.2.4.101 – 10.2.4.102	10.2.4.103
27	10.2.4.104/30	10.2.4.105 – 10.2.4.106	10.2.4.107
28	10.2.4.108/30	10.2.4.109 – 10.2.4.110	10.2.4.111
29	10.2.4.112/30	10.2.4.113 – 10.2.4.114	10.2.4.115
30	10.2.4.116/30	10.2.4.117 – 10.2.4.118	10.2.4.119
31	10.2.4.120/30	10.2.4.121 – 10.2.4.122	10.2.4.123
32	10.2.4.124/30	10.2.4.125 – 10.2.4.126	10.2.4.127
33	10.2.4.128/30	10.2.4.129 – 10.2.4.130	10.2.4.131
34	10.2.4.132/30	10.2.4.133 – 10.2.4.134	10.2.4.135
35	10.2.4.136/30	10.2.4.137 – 10.2.4.138	10.2.4.139
36	10.2.4.140/30	10.2.4.141 – 10.2.4.142	10.2.4.143
37	10.2.4.144/30	10.2.4.145 – 10.2.4.146	10.2.4.147
38	10.2.4.148/30	10.2.4.149 – 10.2.4.150	10.2.4.151
39	10.2.4.152/30	10.2.4.153 – 10.2.4.154	10.2.4.155
40	10.2.4.156/30	10.2.4.157 – 10.2.4.158	10.2.4.159
41	10.2.4.160/30	10.2.4.161 – 10.2.4.162	10.2.4.163
42	10.2.4.164/30	10.2.4.165 – 10.2.4.166	10.2.4.167
43	10.2.4.168/30	10.2.4.169 – 10.2.4.170	10.2.4.171
44	10.2.4.172/30	10.2.4.173 – 10.2.4.174	10.2.4.175
45	10.2.4.176/30	10.2.4.177 – 10.2.4.178	10.2.4.179
46	10.2.4.180/30	10.2.4.181 – 10.2.4.182	10.2.4.183
47	10.2.4.184/30	10.2.4.185 – 10.2.4.186	10.2.4.187
48	10.2.4.188/30	10.2.4.189 – 10.2.4.190	10.2.4.191
49	10.2.4.192/30	10.2.4.193 – 10.2.4.194	10.2.4.195
50	10.2.4.196/30	10.2.4.197 – 10.2.4.198	10.2.4.199
51	10.2.4.200/30	10.2.4.201 – 10.2.4.202	10.2.4.203
52	10.2.4.204/30	10.2.4.205 – 10.2.4.206	10.2.4.207
53	10.2.4.208/30	10.2.4.209 – 10.2.4.210	10.2.4.211
54	10.2.4.212/30	10.2.4.213 – 10.2.4.214	10.2.4.215
55	10.2.4.216/30	10.2.4.217 – 10.2.4.218	10.2.4.219
56	10.2.4.220/30	10.2.4.221 – 10.2.4.222	10.2.4.223
57	10.2.4.224/30	10.2.4.225 – 10.2.4.226	10.2.4.227
58	10.2.4.228/30	10.2.4.229 – 10.2.4.230	10.2.4.231
59	10.2.4.232/30	10.2.4.233 – 10.2.4.234	10.2.4.235
60	10.2.4.236/30	10.2.4.237 – 10.2.4.238	10.2.4.239
61	10.2.4.240/30	10.2.4.241 – 10.2.4.242	10.2.4.243
62	10.2.4.244/30	10.2.4.245 – 10.2.4.246	10.2.4.247
63	10.2.4.248/30	10.2.4.249 – 10.2.4.250	10.2.4.251
64	10.2.4.252/30	10.2.4.253 – 10.2.4.254	10.2.4.255

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 →