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)10.185.86.0/24

network10.185.86.0/24

broadcast10.185.86.255

first host10.185.86.1

last host10.185.86.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.185.86.0/24

address00001010.10111001.01010110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10111001.01010110.00000000

broadcast00001010.10111001.01010110.11111111

green = network part, grey = host part

hex0x0ab95600

decimal179918336

reverse dns0.86.185.10.in-addr.arpa

ipv4-mapped::ffff:ab9:5600

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.185.86.0/30	10.185.86.1 – 10.185.86.2	10.185.86.3
2	10.185.86.4/30	10.185.86.5 – 10.185.86.6	10.185.86.7
3	10.185.86.8/30	10.185.86.9 – 10.185.86.10	10.185.86.11
4	10.185.86.12/30	10.185.86.13 – 10.185.86.14	10.185.86.15
5	10.185.86.16/30	10.185.86.17 – 10.185.86.18	10.185.86.19
6	10.185.86.20/30	10.185.86.21 – 10.185.86.22	10.185.86.23
7	10.185.86.24/30	10.185.86.25 – 10.185.86.26	10.185.86.27
8	10.185.86.28/30	10.185.86.29 – 10.185.86.30	10.185.86.31
9	10.185.86.32/30	10.185.86.33 – 10.185.86.34	10.185.86.35
10	10.185.86.36/30	10.185.86.37 – 10.185.86.38	10.185.86.39
11	10.185.86.40/30	10.185.86.41 – 10.185.86.42	10.185.86.43
12	10.185.86.44/30	10.185.86.45 – 10.185.86.46	10.185.86.47
13	10.185.86.48/30	10.185.86.49 – 10.185.86.50	10.185.86.51
14	10.185.86.52/30	10.185.86.53 – 10.185.86.54	10.185.86.55
15	10.185.86.56/30	10.185.86.57 – 10.185.86.58	10.185.86.59
16	10.185.86.60/30	10.185.86.61 – 10.185.86.62	10.185.86.63
17	10.185.86.64/30	10.185.86.65 – 10.185.86.66	10.185.86.67
18	10.185.86.68/30	10.185.86.69 – 10.185.86.70	10.185.86.71
19	10.185.86.72/30	10.185.86.73 – 10.185.86.74	10.185.86.75
20	10.185.86.76/30	10.185.86.77 – 10.185.86.78	10.185.86.79
21	10.185.86.80/30	10.185.86.81 – 10.185.86.82	10.185.86.83
22	10.185.86.84/30	10.185.86.85 – 10.185.86.86	10.185.86.87
23	10.185.86.88/30	10.185.86.89 – 10.185.86.90	10.185.86.91
24	10.185.86.92/30	10.185.86.93 – 10.185.86.94	10.185.86.95
25	10.185.86.96/30	10.185.86.97 – 10.185.86.98	10.185.86.99
26	10.185.86.100/30	10.185.86.101 – 10.185.86.102	10.185.86.103
27	10.185.86.104/30	10.185.86.105 – 10.185.86.106	10.185.86.107
28	10.185.86.108/30	10.185.86.109 – 10.185.86.110	10.185.86.111
29	10.185.86.112/30	10.185.86.113 – 10.185.86.114	10.185.86.115
30	10.185.86.116/30	10.185.86.117 – 10.185.86.118	10.185.86.119
31	10.185.86.120/30	10.185.86.121 – 10.185.86.122	10.185.86.123
32	10.185.86.124/30	10.185.86.125 – 10.185.86.126	10.185.86.127
33	10.185.86.128/30	10.185.86.129 – 10.185.86.130	10.185.86.131
34	10.185.86.132/30	10.185.86.133 – 10.185.86.134	10.185.86.135
35	10.185.86.136/30	10.185.86.137 – 10.185.86.138	10.185.86.139
36	10.185.86.140/30	10.185.86.141 – 10.185.86.142	10.185.86.143
37	10.185.86.144/30	10.185.86.145 – 10.185.86.146	10.185.86.147
38	10.185.86.148/30	10.185.86.149 – 10.185.86.150	10.185.86.151
39	10.185.86.152/30	10.185.86.153 – 10.185.86.154	10.185.86.155
40	10.185.86.156/30	10.185.86.157 – 10.185.86.158	10.185.86.159
41	10.185.86.160/30	10.185.86.161 – 10.185.86.162	10.185.86.163
42	10.185.86.164/30	10.185.86.165 – 10.185.86.166	10.185.86.167
43	10.185.86.168/30	10.185.86.169 – 10.185.86.170	10.185.86.171
44	10.185.86.172/30	10.185.86.173 – 10.185.86.174	10.185.86.175
45	10.185.86.176/30	10.185.86.177 – 10.185.86.178	10.185.86.179
46	10.185.86.180/30	10.185.86.181 – 10.185.86.182	10.185.86.183
47	10.185.86.184/30	10.185.86.185 – 10.185.86.186	10.185.86.187
48	10.185.86.188/30	10.185.86.189 – 10.185.86.190	10.185.86.191
49	10.185.86.192/30	10.185.86.193 – 10.185.86.194	10.185.86.195
50	10.185.86.196/30	10.185.86.197 – 10.185.86.198	10.185.86.199
51	10.185.86.200/30	10.185.86.201 – 10.185.86.202	10.185.86.203
52	10.185.86.204/30	10.185.86.205 – 10.185.86.206	10.185.86.207
53	10.185.86.208/30	10.185.86.209 – 10.185.86.210	10.185.86.211
54	10.185.86.212/30	10.185.86.213 – 10.185.86.214	10.185.86.215
55	10.185.86.216/30	10.185.86.217 – 10.185.86.218	10.185.86.219
56	10.185.86.220/30	10.185.86.221 – 10.185.86.222	10.185.86.223
57	10.185.86.224/30	10.185.86.225 – 10.185.86.226	10.185.86.227
58	10.185.86.228/30	10.185.86.229 – 10.185.86.230	10.185.86.231
59	10.185.86.232/30	10.185.86.233 – 10.185.86.234	10.185.86.235
60	10.185.86.236/30	10.185.86.237 – 10.185.86.238	10.185.86.239
61	10.185.86.240/30	10.185.86.241 – 10.185.86.242	10.185.86.243
62	10.185.86.244/30	10.185.86.245 – 10.185.86.246	10.185.86.247
63	10.185.86.248/30	10.185.86.249 – 10.185.86.250	10.185.86.251
64	10.185.86.252/30	10.185.86.253 – 10.185.86.254	10.185.86.255

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 →