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)10.2.245.0/24

network10.2.245.0/24

broadcast10.2.245.255

first host10.2.245.1

last host10.2.245.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.245.0/24

address00001010.00000010.11110101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11110101.00000000

broadcast00001010.00000010.11110101.11111111

green = network part, grey = host part

hex0x0a02f500

decimal167965952

reverse dns0.245.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f500

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.245.0/30	10.2.245.1 – 10.2.245.2	10.2.245.3
2	10.2.245.4/30	10.2.245.5 – 10.2.245.6	10.2.245.7
3	10.2.245.8/30	10.2.245.9 – 10.2.245.10	10.2.245.11
4	10.2.245.12/30	10.2.245.13 – 10.2.245.14	10.2.245.15
5	10.2.245.16/30	10.2.245.17 – 10.2.245.18	10.2.245.19
6	10.2.245.20/30	10.2.245.21 – 10.2.245.22	10.2.245.23
7	10.2.245.24/30	10.2.245.25 – 10.2.245.26	10.2.245.27
8	10.2.245.28/30	10.2.245.29 – 10.2.245.30	10.2.245.31
9	10.2.245.32/30	10.2.245.33 – 10.2.245.34	10.2.245.35
10	10.2.245.36/30	10.2.245.37 – 10.2.245.38	10.2.245.39
11	10.2.245.40/30	10.2.245.41 – 10.2.245.42	10.2.245.43
12	10.2.245.44/30	10.2.245.45 – 10.2.245.46	10.2.245.47
13	10.2.245.48/30	10.2.245.49 – 10.2.245.50	10.2.245.51
14	10.2.245.52/30	10.2.245.53 – 10.2.245.54	10.2.245.55
15	10.2.245.56/30	10.2.245.57 – 10.2.245.58	10.2.245.59
16	10.2.245.60/30	10.2.245.61 – 10.2.245.62	10.2.245.63
17	10.2.245.64/30	10.2.245.65 – 10.2.245.66	10.2.245.67
18	10.2.245.68/30	10.2.245.69 – 10.2.245.70	10.2.245.71
19	10.2.245.72/30	10.2.245.73 – 10.2.245.74	10.2.245.75
20	10.2.245.76/30	10.2.245.77 – 10.2.245.78	10.2.245.79
21	10.2.245.80/30	10.2.245.81 – 10.2.245.82	10.2.245.83
22	10.2.245.84/30	10.2.245.85 – 10.2.245.86	10.2.245.87
23	10.2.245.88/30	10.2.245.89 – 10.2.245.90	10.2.245.91
24	10.2.245.92/30	10.2.245.93 – 10.2.245.94	10.2.245.95
25	10.2.245.96/30	10.2.245.97 – 10.2.245.98	10.2.245.99
26	10.2.245.100/30	10.2.245.101 – 10.2.245.102	10.2.245.103
27	10.2.245.104/30	10.2.245.105 – 10.2.245.106	10.2.245.107
28	10.2.245.108/30	10.2.245.109 – 10.2.245.110	10.2.245.111
29	10.2.245.112/30	10.2.245.113 – 10.2.245.114	10.2.245.115
30	10.2.245.116/30	10.2.245.117 – 10.2.245.118	10.2.245.119
31	10.2.245.120/30	10.2.245.121 – 10.2.245.122	10.2.245.123
32	10.2.245.124/30	10.2.245.125 – 10.2.245.126	10.2.245.127
33	10.2.245.128/30	10.2.245.129 – 10.2.245.130	10.2.245.131
34	10.2.245.132/30	10.2.245.133 – 10.2.245.134	10.2.245.135
35	10.2.245.136/30	10.2.245.137 – 10.2.245.138	10.2.245.139
36	10.2.245.140/30	10.2.245.141 – 10.2.245.142	10.2.245.143
37	10.2.245.144/30	10.2.245.145 – 10.2.245.146	10.2.245.147
38	10.2.245.148/30	10.2.245.149 – 10.2.245.150	10.2.245.151
39	10.2.245.152/30	10.2.245.153 – 10.2.245.154	10.2.245.155
40	10.2.245.156/30	10.2.245.157 – 10.2.245.158	10.2.245.159
41	10.2.245.160/30	10.2.245.161 – 10.2.245.162	10.2.245.163
42	10.2.245.164/30	10.2.245.165 – 10.2.245.166	10.2.245.167
43	10.2.245.168/30	10.2.245.169 – 10.2.245.170	10.2.245.171
44	10.2.245.172/30	10.2.245.173 – 10.2.245.174	10.2.245.175
45	10.2.245.176/30	10.2.245.177 – 10.2.245.178	10.2.245.179
46	10.2.245.180/30	10.2.245.181 – 10.2.245.182	10.2.245.183
47	10.2.245.184/30	10.2.245.185 – 10.2.245.186	10.2.245.187
48	10.2.245.188/30	10.2.245.189 – 10.2.245.190	10.2.245.191
49	10.2.245.192/30	10.2.245.193 – 10.2.245.194	10.2.245.195
50	10.2.245.196/30	10.2.245.197 – 10.2.245.198	10.2.245.199
51	10.2.245.200/30	10.2.245.201 – 10.2.245.202	10.2.245.203
52	10.2.245.204/30	10.2.245.205 – 10.2.245.206	10.2.245.207
53	10.2.245.208/30	10.2.245.209 – 10.2.245.210	10.2.245.211
54	10.2.245.212/30	10.2.245.213 – 10.2.245.214	10.2.245.215
55	10.2.245.216/30	10.2.245.217 – 10.2.245.218	10.2.245.219
56	10.2.245.220/30	10.2.245.221 – 10.2.245.222	10.2.245.223
57	10.2.245.224/30	10.2.245.225 – 10.2.245.226	10.2.245.227
58	10.2.245.228/30	10.2.245.229 – 10.2.245.230	10.2.245.231
59	10.2.245.232/30	10.2.245.233 – 10.2.245.234	10.2.245.235
60	10.2.245.236/30	10.2.245.237 – 10.2.245.238	10.2.245.239
61	10.2.245.240/30	10.2.245.241 – 10.2.245.242	10.2.245.243
62	10.2.245.244/30	10.2.245.245 – 10.2.245.246	10.2.245.247
63	10.2.245.248/30	10.2.245.249 – 10.2.245.250	10.2.245.251
64	10.2.245.252/30	10.2.245.253 – 10.2.245.254	10.2.245.255

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 →