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)10.2.154.0/24

network10.2.154.0/24

broadcast10.2.154.255

first host10.2.154.1

last host10.2.154.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.154.0/24

address00001010.00000010.10011010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10011010.00000000

broadcast00001010.00000010.10011010.11111111

green = network part, grey = host part

hex0x0a029a00

decimal167942656

reverse dns0.154.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9a00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.154.0/30	10.2.154.1 – 10.2.154.2	10.2.154.3
2	10.2.154.4/30	10.2.154.5 – 10.2.154.6	10.2.154.7
3	10.2.154.8/30	10.2.154.9 – 10.2.154.10	10.2.154.11
4	10.2.154.12/30	10.2.154.13 – 10.2.154.14	10.2.154.15
5	10.2.154.16/30	10.2.154.17 – 10.2.154.18	10.2.154.19
6	10.2.154.20/30	10.2.154.21 – 10.2.154.22	10.2.154.23
7	10.2.154.24/30	10.2.154.25 – 10.2.154.26	10.2.154.27
8	10.2.154.28/30	10.2.154.29 – 10.2.154.30	10.2.154.31
9	10.2.154.32/30	10.2.154.33 – 10.2.154.34	10.2.154.35
10	10.2.154.36/30	10.2.154.37 – 10.2.154.38	10.2.154.39
11	10.2.154.40/30	10.2.154.41 – 10.2.154.42	10.2.154.43
12	10.2.154.44/30	10.2.154.45 – 10.2.154.46	10.2.154.47
13	10.2.154.48/30	10.2.154.49 – 10.2.154.50	10.2.154.51
14	10.2.154.52/30	10.2.154.53 – 10.2.154.54	10.2.154.55
15	10.2.154.56/30	10.2.154.57 – 10.2.154.58	10.2.154.59
16	10.2.154.60/30	10.2.154.61 – 10.2.154.62	10.2.154.63
17	10.2.154.64/30	10.2.154.65 – 10.2.154.66	10.2.154.67
18	10.2.154.68/30	10.2.154.69 – 10.2.154.70	10.2.154.71
19	10.2.154.72/30	10.2.154.73 – 10.2.154.74	10.2.154.75
20	10.2.154.76/30	10.2.154.77 – 10.2.154.78	10.2.154.79
21	10.2.154.80/30	10.2.154.81 – 10.2.154.82	10.2.154.83
22	10.2.154.84/30	10.2.154.85 – 10.2.154.86	10.2.154.87
23	10.2.154.88/30	10.2.154.89 – 10.2.154.90	10.2.154.91
24	10.2.154.92/30	10.2.154.93 – 10.2.154.94	10.2.154.95
25	10.2.154.96/30	10.2.154.97 – 10.2.154.98	10.2.154.99
26	10.2.154.100/30	10.2.154.101 – 10.2.154.102	10.2.154.103
27	10.2.154.104/30	10.2.154.105 – 10.2.154.106	10.2.154.107
28	10.2.154.108/30	10.2.154.109 – 10.2.154.110	10.2.154.111
29	10.2.154.112/30	10.2.154.113 – 10.2.154.114	10.2.154.115
30	10.2.154.116/30	10.2.154.117 – 10.2.154.118	10.2.154.119
31	10.2.154.120/30	10.2.154.121 – 10.2.154.122	10.2.154.123
32	10.2.154.124/30	10.2.154.125 – 10.2.154.126	10.2.154.127
33	10.2.154.128/30	10.2.154.129 – 10.2.154.130	10.2.154.131
34	10.2.154.132/30	10.2.154.133 – 10.2.154.134	10.2.154.135
35	10.2.154.136/30	10.2.154.137 – 10.2.154.138	10.2.154.139
36	10.2.154.140/30	10.2.154.141 – 10.2.154.142	10.2.154.143
37	10.2.154.144/30	10.2.154.145 – 10.2.154.146	10.2.154.147
38	10.2.154.148/30	10.2.154.149 – 10.2.154.150	10.2.154.151
39	10.2.154.152/30	10.2.154.153 – 10.2.154.154	10.2.154.155
40	10.2.154.156/30	10.2.154.157 – 10.2.154.158	10.2.154.159
41	10.2.154.160/30	10.2.154.161 – 10.2.154.162	10.2.154.163
42	10.2.154.164/30	10.2.154.165 – 10.2.154.166	10.2.154.167
43	10.2.154.168/30	10.2.154.169 – 10.2.154.170	10.2.154.171
44	10.2.154.172/30	10.2.154.173 – 10.2.154.174	10.2.154.175
45	10.2.154.176/30	10.2.154.177 – 10.2.154.178	10.2.154.179
46	10.2.154.180/30	10.2.154.181 – 10.2.154.182	10.2.154.183
47	10.2.154.184/30	10.2.154.185 – 10.2.154.186	10.2.154.187
48	10.2.154.188/30	10.2.154.189 – 10.2.154.190	10.2.154.191
49	10.2.154.192/30	10.2.154.193 – 10.2.154.194	10.2.154.195
50	10.2.154.196/30	10.2.154.197 – 10.2.154.198	10.2.154.199
51	10.2.154.200/30	10.2.154.201 – 10.2.154.202	10.2.154.203
52	10.2.154.204/30	10.2.154.205 – 10.2.154.206	10.2.154.207
53	10.2.154.208/30	10.2.154.209 – 10.2.154.210	10.2.154.211
54	10.2.154.212/30	10.2.154.213 – 10.2.154.214	10.2.154.215
55	10.2.154.216/30	10.2.154.217 – 10.2.154.218	10.2.154.219
56	10.2.154.220/30	10.2.154.221 – 10.2.154.222	10.2.154.223
57	10.2.154.224/30	10.2.154.225 – 10.2.154.226	10.2.154.227
58	10.2.154.228/30	10.2.154.229 – 10.2.154.230	10.2.154.231
59	10.2.154.232/30	10.2.154.233 – 10.2.154.234	10.2.154.235
60	10.2.154.236/30	10.2.154.237 – 10.2.154.238	10.2.154.239
61	10.2.154.240/30	10.2.154.241 – 10.2.154.242	10.2.154.243
62	10.2.154.244/30	10.2.154.245 – 10.2.154.246	10.2.154.247
63	10.2.154.248/30	10.2.154.249 – 10.2.154.250	10.2.154.251
64	10.2.154.252/30	10.2.154.253 – 10.2.154.254	10.2.154.255

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 →