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)10.158.63.0/24

network10.158.63.0/24

broadcast10.158.63.255

first host10.158.63.1

last host10.158.63.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.158.63.0/24

address00001010.10011110.00111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10011110.00111111.00000000

broadcast00001010.10011110.00111111.11111111

green = network part, grey = host part

hex0x0a9e3f00

decimal178142976

reverse dns0.63.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:3f00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.158.63.0/30	10.158.63.1 – 10.158.63.2	10.158.63.3
2	10.158.63.4/30	10.158.63.5 – 10.158.63.6	10.158.63.7
3	10.158.63.8/30	10.158.63.9 – 10.158.63.10	10.158.63.11
4	10.158.63.12/30	10.158.63.13 – 10.158.63.14	10.158.63.15
5	10.158.63.16/30	10.158.63.17 – 10.158.63.18	10.158.63.19
6	10.158.63.20/30	10.158.63.21 – 10.158.63.22	10.158.63.23
7	10.158.63.24/30	10.158.63.25 – 10.158.63.26	10.158.63.27
8	10.158.63.28/30	10.158.63.29 – 10.158.63.30	10.158.63.31
9	10.158.63.32/30	10.158.63.33 – 10.158.63.34	10.158.63.35
10	10.158.63.36/30	10.158.63.37 – 10.158.63.38	10.158.63.39
11	10.158.63.40/30	10.158.63.41 – 10.158.63.42	10.158.63.43
12	10.158.63.44/30	10.158.63.45 – 10.158.63.46	10.158.63.47
13	10.158.63.48/30	10.158.63.49 – 10.158.63.50	10.158.63.51
14	10.158.63.52/30	10.158.63.53 – 10.158.63.54	10.158.63.55
15	10.158.63.56/30	10.158.63.57 – 10.158.63.58	10.158.63.59
16	10.158.63.60/30	10.158.63.61 – 10.158.63.62	10.158.63.63
17	10.158.63.64/30	10.158.63.65 – 10.158.63.66	10.158.63.67
18	10.158.63.68/30	10.158.63.69 – 10.158.63.70	10.158.63.71
19	10.158.63.72/30	10.158.63.73 – 10.158.63.74	10.158.63.75
20	10.158.63.76/30	10.158.63.77 – 10.158.63.78	10.158.63.79
21	10.158.63.80/30	10.158.63.81 – 10.158.63.82	10.158.63.83
22	10.158.63.84/30	10.158.63.85 – 10.158.63.86	10.158.63.87
23	10.158.63.88/30	10.158.63.89 – 10.158.63.90	10.158.63.91
24	10.158.63.92/30	10.158.63.93 – 10.158.63.94	10.158.63.95
25	10.158.63.96/30	10.158.63.97 – 10.158.63.98	10.158.63.99
26	10.158.63.100/30	10.158.63.101 – 10.158.63.102	10.158.63.103
27	10.158.63.104/30	10.158.63.105 – 10.158.63.106	10.158.63.107
28	10.158.63.108/30	10.158.63.109 – 10.158.63.110	10.158.63.111
29	10.158.63.112/30	10.158.63.113 – 10.158.63.114	10.158.63.115
30	10.158.63.116/30	10.158.63.117 – 10.158.63.118	10.158.63.119
31	10.158.63.120/30	10.158.63.121 – 10.158.63.122	10.158.63.123
32	10.158.63.124/30	10.158.63.125 – 10.158.63.126	10.158.63.127
33	10.158.63.128/30	10.158.63.129 – 10.158.63.130	10.158.63.131
34	10.158.63.132/30	10.158.63.133 – 10.158.63.134	10.158.63.135
35	10.158.63.136/30	10.158.63.137 – 10.158.63.138	10.158.63.139
36	10.158.63.140/30	10.158.63.141 – 10.158.63.142	10.158.63.143
37	10.158.63.144/30	10.158.63.145 – 10.158.63.146	10.158.63.147
38	10.158.63.148/30	10.158.63.149 – 10.158.63.150	10.158.63.151
39	10.158.63.152/30	10.158.63.153 – 10.158.63.154	10.158.63.155
40	10.158.63.156/30	10.158.63.157 – 10.158.63.158	10.158.63.159
41	10.158.63.160/30	10.158.63.161 – 10.158.63.162	10.158.63.163
42	10.158.63.164/30	10.158.63.165 – 10.158.63.166	10.158.63.167
43	10.158.63.168/30	10.158.63.169 – 10.158.63.170	10.158.63.171
44	10.158.63.172/30	10.158.63.173 – 10.158.63.174	10.158.63.175
45	10.158.63.176/30	10.158.63.177 – 10.158.63.178	10.158.63.179
46	10.158.63.180/30	10.158.63.181 – 10.158.63.182	10.158.63.183
47	10.158.63.184/30	10.158.63.185 – 10.158.63.186	10.158.63.187
48	10.158.63.188/30	10.158.63.189 – 10.158.63.190	10.158.63.191
49	10.158.63.192/30	10.158.63.193 – 10.158.63.194	10.158.63.195
50	10.158.63.196/30	10.158.63.197 – 10.158.63.198	10.158.63.199
51	10.158.63.200/30	10.158.63.201 – 10.158.63.202	10.158.63.203
52	10.158.63.204/30	10.158.63.205 – 10.158.63.206	10.158.63.207
53	10.158.63.208/30	10.158.63.209 – 10.158.63.210	10.158.63.211
54	10.158.63.212/30	10.158.63.213 – 10.158.63.214	10.158.63.215
55	10.158.63.216/30	10.158.63.217 – 10.158.63.218	10.158.63.219
56	10.158.63.220/30	10.158.63.221 – 10.158.63.222	10.158.63.223
57	10.158.63.224/30	10.158.63.225 – 10.158.63.226	10.158.63.227
58	10.158.63.228/30	10.158.63.229 – 10.158.63.230	10.158.63.231
59	10.158.63.232/30	10.158.63.233 – 10.158.63.234	10.158.63.235
60	10.158.63.236/30	10.158.63.237 – 10.158.63.238	10.158.63.239
61	10.158.63.240/30	10.158.63.241 – 10.158.63.242	10.158.63.243
62	10.158.63.244/30	10.158.63.245 – 10.158.63.246	10.158.63.247
63	10.158.63.248/30	10.158.63.249 – 10.158.63.250	10.158.63.251
64	10.158.63.252/30	10.158.63.253 – 10.158.63.254	10.158.63.255

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 →