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)10.76.205.0/24

network10.76.205.0/24

broadcast10.76.205.255

first host10.76.205.1

last host10.76.205.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.76.205.0/24

address00001010.01001100.11001101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001100.11001101.00000000

broadcast00001010.01001100.11001101.11111111

green = network part, grey = host part

hex0x0a4ccd00

decimal172805376

reverse dns0.205.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:cd00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.205.0/30	10.76.205.1 – 10.76.205.2	10.76.205.3
2	10.76.205.4/30	10.76.205.5 – 10.76.205.6	10.76.205.7
3	10.76.205.8/30	10.76.205.9 – 10.76.205.10	10.76.205.11
4	10.76.205.12/30	10.76.205.13 – 10.76.205.14	10.76.205.15
5	10.76.205.16/30	10.76.205.17 – 10.76.205.18	10.76.205.19
6	10.76.205.20/30	10.76.205.21 – 10.76.205.22	10.76.205.23
7	10.76.205.24/30	10.76.205.25 – 10.76.205.26	10.76.205.27
8	10.76.205.28/30	10.76.205.29 – 10.76.205.30	10.76.205.31
9	10.76.205.32/30	10.76.205.33 – 10.76.205.34	10.76.205.35
10	10.76.205.36/30	10.76.205.37 – 10.76.205.38	10.76.205.39
11	10.76.205.40/30	10.76.205.41 – 10.76.205.42	10.76.205.43
12	10.76.205.44/30	10.76.205.45 – 10.76.205.46	10.76.205.47
13	10.76.205.48/30	10.76.205.49 – 10.76.205.50	10.76.205.51
14	10.76.205.52/30	10.76.205.53 – 10.76.205.54	10.76.205.55
15	10.76.205.56/30	10.76.205.57 – 10.76.205.58	10.76.205.59
16	10.76.205.60/30	10.76.205.61 – 10.76.205.62	10.76.205.63
17	10.76.205.64/30	10.76.205.65 – 10.76.205.66	10.76.205.67
18	10.76.205.68/30	10.76.205.69 – 10.76.205.70	10.76.205.71
19	10.76.205.72/30	10.76.205.73 – 10.76.205.74	10.76.205.75
20	10.76.205.76/30	10.76.205.77 – 10.76.205.78	10.76.205.79
21	10.76.205.80/30	10.76.205.81 – 10.76.205.82	10.76.205.83
22	10.76.205.84/30	10.76.205.85 – 10.76.205.86	10.76.205.87
23	10.76.205.88/30	10.76.205.89 – 10.76.205.90	10.76.205.91
24	10.76.205.92/30	10.76.205.93 – 10.76.205.94	10.76.205.95
25	10.76.205.96/30	10.76.205.97 – 10.76.205.98	10.76.205.99
26	10.76.205.100/30	10.76.205.101 – 10.76.205.102	10.76.205.103
27	10.76.205.104/30	10.76.205.105 – 10.76.205.106	10.76.205.107
28	10.76.205.108/30	10.76.205.109 – 10.76.205.110	10.76.205.111
29	10.76.205.112/30	10.76.205.113 – 10.76.205.114	10.76.205.115
30	10.76.205.116/30	10.76.205.117 – 10.76.205.118	10.76.205.119
31	10.76.205.120/30	10.76.205.121 – 10.76.205.122	10.76.205.123
32	10.76.205.124/30	10.76.205.125 – 10.76.205.126	10.76.205.127
33	10.76.205.128/30	10.76.205.129 – 10.76.205.130	10.76.205.131
34	10.76.205.132/30	10.76.205.133 – 10.76.205.134	10.76.205.135
35	10.76.205.136/30	10.76.205.137 – 10.76.205.138	10.76.205.139
36	10.76.205.140/30	10.76.205.141 – 10.76.205.142	10.76.205.143
37	10.76.205.144/30	10.76.205.145 – 10.76.205.146	10.76.205.147
38	10.76.205.148/30	10.76.205.149 – 10.76.205.150	10.76.205.151
39	10.76.205.152/30	10.76.205.153 – 10.76.205.154	10.76.205.155
40	10.76.205.156/30	10.76.205.157 – 10.76.205.158	10.76.205.159
41	10.76.205.160/30	10.76.205.161 – 10.76.205.162	10.76.205.163
42	10.76.205.164/30	10.76.205.165 – 10.76.205.166	10.76.205.167
43	10.76.205.168/30	10.76.205.169 – 10.76.205.170	10.76.205.171
44	10.76.205.172/30	10.76.205.173 – 10.76.205.174	10.76.205.175
45	10.76.205.176/30	10.76.205.177 – 10.76.205.178	10.76.205.179
46	10.76.205.180/30	10.76.205.181 – 10.76.205.182	10.76.205.183
47	10.76.205.184/30	10.76.205.185 – 10.76.205.186	10.76.205.187
48	10.76.205.188/30	10.76.205.189 – 10.76.205.190	10.76.205.191
49	10.76.205.192/30	10.76.205.193 – 10.76.205.194	10.76.205.195
50	10.76.205.196/30	10.76.205.197 – 10.76.205.198	10.76.205.199
51	10.76.205.200/30	10.76.205.201 – 10.76.205.202	10.76.205.203
52	10.76.205.204/30	10.76.205.205 – 10.76.205.206	10.76.205.207
53	10.76.205.208/30	10.76.205.209 – 10.76.205.210	10.76.205.211
54	10.76.205.212/30	10.76.205.213 – 10.76.205.214	10.76.205.215
55	10.76.205.216/30	10.76.205.217 – 10.76.205.218	10.76.205.219
56	10.76.205.220/30	10.76.205.221 – 10.76.205.222	10.76.205.223
57	10.76.205.224/30	10.76.205.225 – 10.76.205.226	10.76.205.227
58	10.76.205.228/30	10.76.205.229 – 10.76.205.230	10.76.205.231
59	10.76.205.232/30	10.76.205.233 – 10.76.205.234	10.76.205.235
60	10.76.205.236/30	10.76.205.237 – 10.76.205.238	10.76.205.239
61	10.76.205.240/30	10.76.205.241 – 10.76.205.242	10.76.205.243
62	10.76.205.244/30	10.76.205.245 – 10.76.205.246	10.76.205.247
63	10.76.205.248/30	10.76.205.249 – 10.76.205.250	10.76.205.251
64	10.76.205.252/30	10.76.205.253 – 10.76.205.254	10.76.205.255

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 →