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)10.4.103.0/24

network10.4.103.0/24

broadcast10.4.103.255

first host10.4.103.1

last host10.4.103.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.4.103.0/24

address00001010.00000100.01100111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000100.01100111.00000000

broadcast00001010.00000100.01100111.11111111

green = network part, grey = host part

hex0x0a046700

decimal168060672

reverse dns0.103.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:6700

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.103.0/30	10.4.103.1 – 10.4.103.2	10.4.103.3
2	10.4.103.4/30	10.4.103.5 – 10.4.103.6	10.4.103.7
3	10.4.103.8/30	10.4.103.9 – 10.4.103.10	10.4.103.11
4	10.4.103.12/30	10.4.103.13 – 10.4.103.14	10.4.103.15
5	10.4.103.16/30	10.4.103.17 – 10.4.103.18	10.4.103.19
6	10.4.103.20/30	10.4.103.21 – 10.4.103.22	10.4.103.23
7	10.4.103.24/30	10.4.103.25 – 10.4.103.26	10.4.103.27
8	10.4.103.28/30	10.4.103.29 – 10.4.103.30	10.4.103.31
9	10.4.103.32/30	10.4.103.33 – 10.4.103.34	10.4.103.35
10	10.4.103.36/30	10.4.103.37 – 10.4.103.38	10.4.103.39
11	10.4.103.40/30	10.4.103.41 – 10.4.103.42	10.4.103.43
12	10.4.103.44/30	10.4.103.45 – 10.4.103.46	10.4.103.47
13	10.4.103.48/30	10.4.103.49 – 10.4.103.50	10.4.103.51
14	10.4.103.52/30	10.4.103.53 – 10.4.103.54	10.4.103.55
15	10.4.103.56/30	10.4.103.57 – 10.4.103.58	10.4.103.59
16	10.4.103.60/30	10.4.103.61 – 10.4.103.62	10.4.103.63
17	10.4.103.64/30	10.4.103.65 – 10.4.103.66	10.4.103.67
18	10.4.103.68/30	10.4.103.69 – 10.4.103.70	10.4.103.71
19	10.4.103.72/30	10.4.103.73 – 10.4.103.74	10.4.103.75
20	10.4.103.76/30	10.4.103.77 – 10.4.103.78	10.4.103.79
21	10.4.103.80/30	10.4.103.81 – 10.4.103.82	10.4.103.83
22	10.4.103.84/30	10.4.103.85 – 10.4.103.86	10.4.103.87
23	10.4.103.88/30	10.4.103.89 – 10.4.103.90	10.4.103.91
24	10.4.103.92/30	10.4.103.93 – 10.4.103.94	10.4.103.95
25	10.4.103.96/30	10.4.103.97 – 10.4.103.98	10.4.103.99
26	10.4.103.100/30	10.4.103.101 – 10.4.103.102	10.4.103.103
27	10.4.103.104/30	10.4.103.105 – 10.4.103.106	10.4.103.107
28	10.4.103.108/30	10.4.103.109 – 10.4.103.110	10.4.103.111
29	10.4.103.112/30	10.4.103.113 – 10.4.103.114	10.4.103.115
30	10.4.103.116/30	10.4.103.117 – 10.4.103.118	10.4.103.119
31	10.4.103.120/30	10.4.103.121 – 10.4.103.122	10.4.103.123
32	10.4.103.124/30	10.4.103.125 – 10.4.103.126	10.4.103.127
33	10.4.103.128/30	10.4.103.129 – 10.4.103.130	10.4.103.131
34	10.4.103.132/30	10.4.103.133 – 10.4.103.134	10.4.103.135
35	10.4.103.136/30	10.4.103.137 – 10.4.103.138	10.4.103.139
36	10.4.103.140/30	10.4.103.141 – 10.4.103.142	10.4.103.143
37	10.4.103.144/30	10.4.103.145 – 10.4.103.146	10.4.103.147
38	10.4.103.148/30	10.4.103.149 – 10.4.103.150	10.4.103.151
39	10.4.103.152/30	10.4.103.153 – 10.4.103.154	10.4.103.155
40	10.4.103.156/30	10.4.103.157 – 10.4.103.158	10.4.103.159
41	10.4.103.160/30	10.4.103.161 – 10.4.103.162	10.4.103.163
42	10.4.103.164/30	10.4.103.165 – 10.4.103.166	10.4.103.167
43	10.4.103.168/30	10.4.103.169 – 10.4.103.170	10.4.103.171
44	10.4.103.172/30	10.4.103.173 – 10.4.103.174	10.4.103.175
45	10.4.103.176/30	10.4.103.177 – 10.4.103.178	10.4.103.179
46	10.4.103.180/30	10.4.103.181 – 10.4.103.182	10.4.103.183
47	10.4.103.184/30	10.4.103.185 – 10.4.103.186	10.4.103.187
48	10.4.103.188/30	10.4.103.189 – 10.4.103.190	10.4.103.191
49	10.4.103.192/30	10.4.103.193 – 10.4.103.194	10.4.103.195
50	10.4.103.196/30	10.4.103.197 – 10.4.103.198	10.4.103.199
51	10.4.103.200/30	10.4.103.201 – 10.4.103.202	10.4.103.203
52	10.4.103.204/30	10.4.103.205 – 10.4.103.206	10.4.103.207
53	10.4.103.208/30	10.4.103.209 – 10.4.103.210	10.4.103.211
54	10.4.103.212/30	10.4.103.213 – 10.4.103.214	10.4.103.215
55	10.4.103.216/30	10.4.103.217 – 10.4.103.218	10.4.103.219
56	10.4.103.220/30	10.4.103.221 – 10.4.103.222	10.4.103.223
57	10.4.103.224/30	10.4.103.225 – 10.4.103.226	10.4.103.227
58	10.4.103.228/30	10.4.103.229 – 10.4.103.230	10.4.103.231
59	10.4.103.232/30	10.4.103.233 – 10.4.103.234	10.4.103.235
60	10.4.103.236/30	10.4.103.237 – 10.4.103.238	10.4.103.239
61	10.4.103.240/30	10.4.103.241 – 10.4.103.242	10.4.103.243
62	10.4.103.244/30	10.4.103.245 – 10.4.103.246	10.4.103.247
63	10.4.103.248/30	10.4.103.249 – 10.4.103.250	10.4.103.251
64	10.4.103.252/30	10.4.103.253 – 10.4.103.254	10.4.103.255

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 →