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)10.3.218.0/24

network10.3.218.0/24

broadcast10.3.218.255

first host10.3.218.1

last host10.3.218.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.218.0/24

address00001010.00000011.11011010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.11011010.00000000

broadcast00001010.00000011.11011010.11111111

green = network part, grey = host part

hex0x0a03da00

decimal168024576

reverse dns0.218.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:da00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.3.218.0/30	10.3.218.1 – 10.3.218.2	10.3.218.3
2	10.3.218.4/30	10.3.218.5 – 10.3.218.6	10.3.218.7
3	10.3.218.8/30	10.3.218.9 – 10.3.218.10	10.3.218.11
4	10.3.218.12/30	10.3.218.13 – 10.3.218.14	10.3.218.15
5	10.3.218.16/30	10.3.218.17 – 10.3.218.18	10.3.218.19
6	10.3.218.20/30	10.3.218.21 – 10.3.218.22	10.3.218.23
7	10.3.218.24/30	10.3.218.25 – 10.3.218.26	10.3.218.27
8	10.3.218.28/30	10.3.218.29 – 10.3.218.30	10.3.218.31
9	10.3.218.32/30	10.3.218.33 – 10.3.218.34	10.3.218.35
10	10.3.218.36/30	10.3.218.37 – 10.3.218.38	10.3.218.39
11	10.3.218.40/30	10.3.218.41 – 10.3.218.42	10.3.218.43
12	10.3.218.44/30	10.3.218.45 – 10.3.218.46	10.3.218.47
13	10.3.218.48/30	10.3.218.49 – 10.3.218.50	10.3.218.51
14	10.3.218.52/30	10.3.218.53 – 10.3.218.54	10.3.218.55
15	10.3.218.56/30	10.3.218.57 – 10.3.218.58	10.3.218.59
16	10.3.218.60/30	10.3.218.61 – 10.3.218.62	10.3.218.63
17	10.3.218.64/30	10.3.218.65 – 10.3.218.66	10.3.218.67
18	10.3.218.68/30	10.3.218.69 – 10.3.218.70	10.3.218.71
19	10.3.218.72/30	10.3.218.73 – 10.3.218.74	10.3.218.75
20	10.3.218.76/30	10.3.218.77 – 10.3.218.78	10.3.218.79
21	10.3.218.80/30	10.3.218.81 – 10.3.218.82	10.3.218.83
22	10.3.218.84/30	10.3.218.85 – 10.3.218.86	10.3.218.87
23	10.3.218.88/30	10.3.218.89 – 10.3.218.90	10.3.218.91
24	10.3.218.92/30	10.3.218.93 – 10.3.218.94	10.3.218.95
25	10.3.218.96/30	10.3.218.97 – 10.3.218.98	10.3.218.99
26	10.3.218.100/30	10.3.218.101 – 10.3.218.102	10.3.218.103
27	10.3.218.104/30	10.3.218.105 – 10.3.218.106	10.3.218.107
28	10.3.218.108/30	10.3.218.109 – 10.3.218.110	10.3.218.111
29	10.3.218.112/30	10.3.218.113 – 10.3.218.114	10.3.218.115
30	10.3.218.116/30	10.3.218.117 – 10.3.218.118	10.3.218.119
31	10.3.218.120/30	10.3.218.121 – 10.3.218.122	10.3.218.123
32	10.3.218.124/30	10.3.218.125 – 10.3.218.126	10.3.218.127
33	10.3.218.128/30	10.3.218.129 – 10.3.218.130	10.3.218.131
34	10.3.218.132/30	10.3.218.133 – 10.3.218.134	10.3.218.135
35	10.3.218.136/30	10.3.218.137 – 10.3.218.138	10.3.218.139
36	10.3.218.140/30	10.3.218.141 – 10.3.218.142	10.3.218.143
37	10.3.218.144/30	10.3.218.145 – 10.3.218.146	10.3.218.147
38	10.3.218.148/30	10.3.218.149 – 10.3.218.150	10.3.218.151
39	10.3.218.152/30	10.3.218.153 – 10.3.218.154	10.3.218.155
40	10.3.218.156/30	10.3.218.157 – 10.3.218.158	10.3.218.159
41	10.3.218.160/30	10.3.218.161 – 10.3.218.162	10.3.218.163
42	10.3.218.164/30	10.3.218.165 – 10.3.218.166	10.3.218.167
43	10.3.218.168/30	10.3.218.169 – 10.3.218.170	10.3.218.171
44	10.3.218.172/30	10.3.218.173 – 10.3.218.174	10.3.218.175
45	10.3.218.176/30	10.3.218.177 – 10.3.218.178	10.3.218.179
46	10.3.218.180/30	10.3.218.181 – 10.3.218.182	10.3.218.183
47	10.3.218.184/30	10.3.218.185 – 10.3.218.186	10.3.218.187
48	10.3.218.188/30	10.3.218.189 – 10.3.218.190	10.3.218.191
49	10.3.218.192/30	10.3.218.193 – 10.3.218.194	10.3.218.195
50	10.3.218.196/30	10.3.218.197 – 10.3.218.198	10.3.218.199
51	10.3.218.200/30	10.3.218.201 – 10.3.218.202	10.3.218.203
52	10.3.218.204/30	10.3.218.205 – 10.3.218.206	10.3.218.207
53	10.3.218.208/30	10.3.218.209 – 10.3.218.210	10.3.218.211
54	10.3.218.212/30	10.3.218.213 – 10.3.218.214	10.3.218.215
55	10.3.218.216/30	10.3.218.217 – 10.3.218.218	10.3.218.219
56	10.3.218.220/30	10.3.218.221 – 10.3.218.222	10.3.218.223
57	10.3.218.224/30	10.3.218.225 – 10.3.218.226	10.3.218.227
58	10.3.218.228/30	10.3.218.229 – 10.3.218.230	10.3.218.231
59	10.3.218.232/30	10.3.218.233 – 10.3.218.234	10.3.218.235
60	10.3.218.236/30	10.3.218.237 – 10.3.218.238	10.3.218.239
61	10.3.218.240/30	10.3.218.241 – 10.3.218.242	10.3.218.243
62	10.3.218.244/30	10.3.218.245 – 10.3.218.246	10.3.218.247
63	10.3.218.248/30	10.3.218.249 – 10.3.218.250	10.3.218.251
64	10.3.218.252/30	10.3.218.253 – 10.3.218.254	10.3.218.255

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 →