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)10.0.199.0/24

network10.0.199.0/24

broadcast10.0.199.255

first host10.0.199.1

last host10.0.199.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.199.0/24

address00001010.00000000.11000111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11000111.00000000

broadcast00001010.00000000.11000111.11111111

green = network part, grey = host part

hex0x0a00c700

decimal167823104

reverse dns0.199.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:c700

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.199.0/30	10.0.199.1 – 10.0.199.2	10.0.199.3
2	10.0.199.4/30	10.0.199.5 – 10.0.199.6	10.0.199.7
3	10.0.199.8/30	10.0.199.9 – 10.0.199.10	10.0.199.11
4	10.0.199.12/30	10.0.199.13 – 10.0.199.14	10.0.199.15
5	10.0.199.16/30	10.0.199.17 – 10.0.199.18	10.0.199.19
6	10.0.199.20/30	10.0.199.21 – 10.0.199.22	10.0.199.23
7	10.0.199.24/30	10.0.199.25 – 10.0.199.26	10.0.199.27
8	10.0.199.28/30	10.0.199.29 – 10.0.199.30	10.0.199.31
9	10.0.199.32/30	10.0.199.33 – 10.0.199.34	10.0.199.35
10	10.0.199.36/30	10.0.199.37 – 10.0.199.38	10.0.199.39
11	10.0.199.40/30	10.0.199.41 – 10.0.199.42	10.0.199.43
12	10.0.199.44/30	10.0.199.45 – 10.0.199.46	10.0.199.47
13	10.0.199.48/30	10.0.199.49 – 10.0.199.50	10.0.199.51
14	10.0.199.52/30	10.0.199.53 – 10.0.199.54	10.0.199.55
15	10.0.199.56/30	10.0.199.57 – 10.0.199.58	10.0.199.59
16	10.0.199.60/30	10.0.199.61 – 10.0.199.62	10.0.199.63
17	10.0.199.64/30	10.0.199.65 – 10.0.199.66	10.0.199.67
18	10.0.199.68/30	10.0.199.69 – 10.0.199.70	10.0.199.71
19	10.0.199.72/30	10.0.199.73 – 10.0.199.74	10.0.199.75
20	10.0.199.76/30	10.0.199.77 – 10.0.199.78	10.0.199.79
21	10.0.199.80/30	10.0.199.81 – 10.0.199.82	10.0.199.83
22	10.0.199.84/30	10.0.199.85 – 10.0.199.86	10.0.199.87
23	10.0.199.88/30	10.0.199.89 – 10.0.199.90	10.0.199.91
24	10.0.199.92/30	10.0.199.93 – 10.0.199.94	10.0.199.95
25	10.0.199.96/30	10.0.199.97 – 10.0.199.98	10.0.199.99
26	10.0.199.100/30	10.0.199.101 – 10.0.199.102	10.0.199.103
27	10.0.199.104/30	10.0.199.105 – 10.0.199.106	10.0.199.107
28	10.0.199.108/30	10.0.199.109 – 10.0.199.110	10.0.199.111
29	10.0.199.112/30	10.0.199.113 – 10.0.199.114	10.0.199.115
30	10.0.199.116/30	10.0.199.117 – 10.0.199.118	10.0.199.119
31	10.0.199.120/30	10.0.199.121 – 10.0.199.122	10.0.199.123
32	10.0.199.124/30	10.0.199.125 – 10.0.199.126	10.0.199.127
33	10.0.199.128/30	10.0.199.129 – 10.0.199.130	10.0.199.131
34	10.0.199.132/30	10.0.199.133 – 10.0.199.134	10.0.199.135
35	10.0.199.136/30	10.0.199.137 – 10.0.199.138	10.0.199.139
36	10.0.199.140/30	10.0.199.141 – 10.0.199.142	10.0.199.143
37	10.0.199.144/30	10.0.199.145 – 10.0.199.146	10.0.199.147
38	10.0.199.148/30	10.0.199.149 – 10.0.199.150	10.0.199.151
39	10.0.199.152/30	10.0.199.153 – 10.0.199.154	10.0.199.155
40	10.0.199.156/30	10.0.199.157 – 10.0.199.158	10.0.199.159
41	10.0.199.160/30	10.0.199.161 – 10.0.199.162	10.0.199.163
42	10.0.199.164/30	10.0.199.165 – 10.0.199.166	10.0.199.167
43	10.0.199.168/30	10.0.199.169 – 10.0.199.170	10.0.199.171
44	10.0.199.172/30	10.0.199.173 – 10.0.199.174	10.0.199.175
45	10.0.199.176/30	10.0.199.177 – 10.0.199.178	10.0.199.179
46	10.0.199.180/30	10.0.199.181 – 10.0.199.182	10.0.199.183
47	10.0.199.184/30	10.0.199.185 – 10.0.199.186	10.0.199.187
48	10.0.199.188/30	10.0.199.189 – 10.0.199.190	10.0.199.191
49	10.0.199.192/30	10.0.199.193 – 10.0.199.194	10.0.199.195
50	10.0.199.196/30	10.0.199.197 – 10.0.199.198	10.0.199.199
51	10.0.199.200/30	10.0.199.201 – 10.0.199.202	10.0.199.203
52	10.0.199.204/30	10.0.199.205 – 10.0.199.206	10.0.199.207
53	10.0.199.208/30	10.0.199.209 – 10.0.199.210	10.0.199.211
54	10.0.199.212/30	10.0.199.213 – 10.0.199.214	10.0.199.215
55	10.0.199.216/30	10.0.199.217 – 10.0.199.218	10.0.199.219
56	10.0.199.220/30	10.0.199.221 – 10.0.199.222	10.0.199.223
57	10.0.199.224/30	10.0.199.225 – 10.0.199.226	10.0.199.227
58	10.0.199.228/30	10.0.199.229 – 10.0.199.230	10.0.199.231
59	10.0.199.232/30	10.0.199.233 – 10.0.199.234	10.0.199.235
60	10.0.199.236/30	10.0.199.237 – 10.0.199.238	10.0.199.239
61	10.0.199.240/30	10.0.199.241 – 10.0.199.242	10.0.199.243
62	10.0.199.244/30	10.0.199.245 – 10.0.199.246	10.0.199.247
63	10.0.199.248/30	10.0.199.249 – 10.0.199.250	10.0.199.251
64	10.0.199.252/30	10.0.199.253 – 10.0.199.254	10.0.199.255

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 →