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)10.217.76.0/24

network10.217.76.0/24

broadcast10.217.76.255

first host10.217.76.1

last host10.217.76.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.217.76.0/24

address00001010.11011001.01001100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.11011001.01001100.00000000

broadcast00001010.11011001.01001100.11111111

green = network part, grey = host part

hex0x0ad94c00

decimal182012928

reverse dns0.76.217.10.in-addr.arpa

ipv4-mapped::ffff:ad9:4c00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.217.76.0/30	10.217.76.1 – 10.217.76.2	10.217.76.3
2	10.217.76.4/30	10.217.76.5 – 10.217.76.6	10.217.76.7
3	10.217.76.8/30	10.217.76.9 – 10.217.76.10	10.217.76.11
4	10.217.76.12/30	10.217.76.13 – 10.217.76.14	10.217.76.15
5	10.217.76.16/30	10.217.76.17 – 10.217.76.18	10.217.76.19
6	10.217.76.20/30	10.217.76.21 – 10.217.76.22	10.217.76.23
7	10.217.76.24/30	10.217.76.25 – 10.217.76.26	10.217.76.27
8	10.217.76.28/30	10.217.76.29 – 10.217.76.30	10.217.76.31
9	10.217.76.32/30	10.217.76.33 – 10.217.76.34	10.217.76.35
10	10.217.76.36/30	10.217.76.37 – 10.217.76.38	10.217.76.39
11	10.217.76.40/30	10.217.76.41 – 10.217.76.42	10.217.76.43
12	10.217.76.44/30	10.217.76.45 – 10.217.76.46	10.217.76.47
13	10.217.76.48/30	10.217.76.49 – 10.217.76.50	10.217.76.51
14	10.217.76.52/30	10.217.76.53 – 10.217.76.54	10.217.76.55
15	10.217.76.56/30	10.217.76.57 – 10.217.76.58	10.217.76.59
16	10.217.76.60/30	10.217.76.61 – 10.217.76.62	10.217.76.63
17	10.217.76.64/30	10.217.76.65 – 10.217.76.66	10.217.76.67
18	10.217.76.68/30	10.217.76.69 – 10.217.76.70	10.217.76.71
19	10.217.76.72/30	10.217.76.73 – 10.217.76.74	10.217.76.75
20	10.217.76.76/30	10.217.76.77 – 10.217.76.78	10.217.76.79
21	10.217.76.80/30	10.217.76.81 – 10.217.76.82	10.217.76.83
22	10.217.76.84/30	10.217.76.85 – 10.217.76.86	10.217.76.87
23	10.217.76.88/30	10.217.76.89 – 10.217.76.90	10.217.76.91
24	10.217.76.92/30	10.217.76.93 – 10.217.76.94	10.217.76.95
25	10.217.76.96/30	10.217.76.97 – 10.217.76.98	10.217.76.99
26	10.217.76.100/30	10.217.76.101 – 10.217.76.102	10.217.76.103
27	10.217.76.104/30	10.217.76.105 – 10.217.76.106	10.217.76.107
28	10.217.76.108/30	10.217.76.109 – 10.217.76.110	10.217.76.111
29	10.217.76.112/30	10.217.76.113 – 10.217.76.114	10.217.76.115
30	10.217.76.116/30	10.217.76.117 – 10.217.76.118	10.217.76.119
31	10.217.76.120/30	10.217.76.121 – 10.217.76.122	10.217.76.123
32	10.217.76.124/30	10.217.76.125 – 10.217.76.126	10.217.76.127
33	10.217.76.128/30	10.217.76.129 – 10.217.76.130	10.217.76.131
34	10.217.76.132/30	10.217.76.133 – 10.217.76.134	10.217.76.135
35	10.217.76.136/30	10.217.76.137 – 10.217.76.138	10.217.76.139
36	10.217.76.140/30	10.217.76.141 – 10.217.76.142	10.217.76.143
37	10.217.76.144/30	10.217.76.145 – 10.217.76.146	10.217.76.147
38	10.217.76.148/30	10.217.76.149 – 10.217.76.150	10.217.76.151
39	10.217.76.152/30	10.217.76.153 – 10.217.76.154	10.217.76.155
40	10.217.76.156/30	10.217.76.157 – 10.217.76.158	10.217.76.159
41	10.217.76.160/30	10.217.76.161 – 10.217.76.162	10.217.76.163
42	10.217.76.164/30	10.217.76.165 – 10.217.76.166	10.217.76.167
43	10.217.76.168/30	10.217.76.169 – 10.217.76.170	10.217.76.171
44	10.217.76.172/30	10.217.76.173 – 10.217.76.174	10.217.76.175
45	10.217.76.176/30	10.217.76.177 – 10.217.76.178	10.217.76.179
46	10.217.76.180/30	10.217.76.181 – 10.217.76.182	10.217.76.183
47	10.217.76.184/30	10.217.76.185 – 10.217.76.186	10.217.76.187
48	10.217.76.188/30	10.217.76.189 – 10.217.76.190	10.217.76.191
49	10.217.76.192/30	10.217.76.193 – 10.217.76.194	10.217.76.195
50	10.217.76.196/30	10.217.76.197 – 10.217.76.198	10.217.76.199
51	10.217.76.200/30	10.217.76.201 – 10.217.76.202	10.217.76.203
52	10.217.76.204/30	10.217.76.205 – 10.217.76.206	10.217.76.207
53	10.217.76.208/30	10.217.76.209 – 10.217.76.210	10.217.76.211
54	10.217.76.212/30	10.217.76.213 – 10.217.76.214	10.217.76.215
55	10.217.76.216/30	10.217.76.217 – 10.217.76.218	10.217.76.219
56	10.217.76.220/30	10.217.76.221 – 10.217.76.222	10.217.76.223
57	10.217.76.224/30	10.217.76.225 – 10.217.76.226	10.217.76.227
58	10.217.76.228/30	10.217.76.229 – 10.217.76.230	10.217.76.231
59	10.217.76.232/30	10.217.76.233 – 10.217.76.234	10.217.76.235
60	10.217.76.236/30	10.217.76.237 – 10.217.76.238	10.217.76.239
61	10.217.76.240/30	10.217.76.241 – 10.217.76.242	10.217.76.243
62	10.217.76.244/30	10.217.76.245 – 10.217.76.246	10.217.76.247
63	10.217.76.248/30	10.217.76.249 – 10.217.76.250	10.217.76.251
64	10.217.76.252/30	10.217.76.253 – 10.217.76.254	10.217.76.255

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 →