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)10.4.0.0/24

network10.4.0.0/24

broadcast10.4.0.255

first host10.4.0.1

last host10.4.0.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.4.0.0/24

address00001010.00000100.00000000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000100.00000000.00000000

broadcast00001010.00000100.00000000.11111111

green = network part, grey = host part

hex0x0a040000

decimal168034304

reverse dns0.0.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:0

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.0.0/30	10.4.0.1 – 10.4.0.2	10.4.0.3
2	10.4.0.4/30	10.4.0.5 – 10.4.0.6	10.4.0.7
3	10.4.0.8/30	10.4.0.9 – 10.4.0.10	10.4.0.11
4	10.4.0.12/30	10.4.0.13 – 10.4.0.14	10.4.0.15
5	10.4.0.16/30	10.4.0.17 – 10.4.0.18	10.4.0.19
6	10.4.0.20/30	10.4.0.21 – 10.4.0.22	10.4.0.23
7	10.4.0.24/30	10.4.0.25 – 10.4.0.26	10.4.0.27
8	10.4.0.28/30	10.4.0.29 – 10.4.0.30	10.4.0.31
9	10.4.0.32/30	10.4.0.33 – 10.4.0.34	10.4.0.35
10	10.4.0.36/30	10.4.0.37 – 10.4.0.38	10.4.0.39
11	10.4.0.40/30	10.4.0.41 – 10.4.0.42	10.4.0.43
12	10.4.0.44/30	10.4.0.45 – 10.4.0.46	10.4.0.47
13	10.4.0.48/30	10.4.0.49 – 10.4.0.50	10.4.0.51
14	10.4.0.52/30	10.4.0.53 – 10.4.0.54	10.4.0.55
15	10.4.0.56/30	10.4.0.57 – 10.4.0.58	10.4.0.59
16	10.4.0.60/30	10.4.0.61 – 10.4.0.62	10.4.0.63
17	10.4.0.64/30	10.4.0.65 – 10.4.0.66	10.4.0.67
18	10.4.0.68/30	10.4.0.69 – 10.4.0.70	10.4.0.71
19	10.4.0.72/30	10.4.0.73 – 10.4.0.74	10.4.0.75
20	10.4.0.76/30	10.4.0.77 – 10.4.0.78	10.4.0.79
21	10.4.0.80/30	10.4.0.81 – 10.4.0.82	10.4.0.83
22	10.4.0.84/30	10.4.0.85 – 10.4.0.86	10.4.0.87
23	10.4.0.88/30	10.4.0.89 – 10.4.0.90	10.4.0.91
24	10.4.0.92/30	10.4.0.93 – 10.4.0.94	10.4.0.95
25	10.4.0.96/30	10.4.0.97 – 10.4.0.98	10.4.0.99
26	10.4.0.100/30	10.4.0.101 – 10.4.0.102	10.4.0.103
27	10.4.0.104/30	10.4.0.105 – 10.4.0.106	10.4.0.107
28	10.4.0.108/30	10.4.0.109 – 10.4.0.110	10.4.0.111
29	10.4.0.112/30	10.4.0.113 – 10.4.0.114	10.4.0.115
30	10.4.0.116/30	10.4.0.117 – 10.4.0.118	10.4.0.119
31	10.4.0.120/30	10.4.0.121 – 10.4.0.122	10.4.0.123
32	10.4.0.124/30	10.4.0.125 – 10.4.0.126	10.4.0.127
33	10.4.0.128/30	10.4.0.129 – 10.4.0.130	10.4.0.131
34	10.4.0.132/30	10.4.0.133 – 10.4.0.134	10.4.0.135
35	10.4.0.136/30	10.4.0.137 – 10.4.0.138	10.4.0.139
36	10.4.0.140/30	10.4.0.141 – 10.4.0.142	10.4.0.143
37	10.4.0.144/30	10.4.0.145 – 10.4.0.146	10.4.0.147
38	10.4.0.148/30	10.4.0.149 – 10.4.0.150	10.4.0.151
39	10.4.0.152/30	10.4.0.153 – 10.4.0.154	10.4.0.155
40	10.4.0.156/30	10.4.0.157 – 10.4.0.158	10.4.0.159
41	10.4.0.160/30	10.4.0.161 – 10.4.0.162	10.4.0.163
42	10.4.0.164/30	10.4.0.165 – 10.4.0.166	10.4.0.167
43	10.4.0.168/30	10.4.0.169 – 10.4.0.170	10.4.0.171
44	10.4.0.172/30	10.4.0.173 – 10.4.0.174	10.4.0.175
45	10.4.0.176/30	10.4.0.177 – 10.4.0.178	10.4.0.179
46	10.4.0.180/30	10.4.0.181 – 10.4.0.182	10.4.0.183
47	10.4.0.184/30	10.4.0.185 – 10.4.0.186	10.4.0.187
48	10.4.0.188/30	10.4.0.189 – 10.4.0.190	10.4.0.191
49	10.4.0.192/30	10.4.0.193 – 10.4.0.194	10.4.0.195
50	10.4.0.196/30	10.4.0.197 – 10.4.0.198	10.4.0.199
51	10.4.0.200/30	10.4.0.201 – 10.4.0.202	10.4.0.203
52	10.4.0.204/30	10.4.0.205 – 10.4.0.206	10.4.0.207
53	10.4.0.208/30	10.4.0.209 – 10.4.0.210	10.4.0.211
54	10.4.0.212/30	10.4.0.213 – 10.4.0.214	10.4.0.215
55	10.4.0.216/30	10.4.0.217 – 10.4.0.218	10.4.0.219
56	10.4.0.220/30	10.4.0.221 – 10.4.0.222	10.4.0.223
57	10.4.0.224/30	10.4.0.225 – 10.4.0.226	10.4.0.227
58	10.4.0.228/30	10.4.0.229 – 10.4.0.230	10.4.0.231
59	10.4.0.232/30	10.4.0.233 – 10.4.0.234	10.4.0.235
60	10.4.0.236/30	10.4.0.237 – 10.4.0.238	10.4.0.239
61	10.4.0.240/30	10.4.0.241 – 10.4.0.242	10.4.0.243
62	10.4.0.244/30	10.4.0.245 – 10.4.0.246	10.4.0.247
63	10.4.0.248/30	10.4.0.249 – 10.4.0.250	10.4.0.251
64	10.4.0.252/30	10.4.0.253 – 10.4.0.254	10.4.0.255

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 →