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)10.2.112.0/23

network10.2.112.0/23

broadcast10.2.113.255

first host10.2.112.1

last host10.2.113.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.112.0/23

address00001010.00000010.01110000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01110000.00000000

broadcast00001010.00000010.01110001.11111111

green = network part, grey = host part

hex0x0a027000

decimal167931904

reverse dns0.112.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.112.0/29	10.2.112.1 – 10.2.112.6	10.2.112.7
2	10.2.112.8/29	10.2.112.9 – 10.2.112.14	10.2.112.15
3	10.2.112.16/29	10.2.112.17 – 10.2.112.22	10.2.112.23
4	10.2.112.24/29	10.2.112.25 – 10.2.112.30	10.2.112.31
5	10.2.112.32/29	10.2.112.33 – 10.2.112.38	10.2.112.39
6	10.2.112.40/29	10.2.112.41 – 10.2.112.46	10.2.112.47
7	10.2.112.48/29	10.2.112.49 – 10.2.112.54	10.2.112.55
8	10.2.112.56/29	10.2.112.57 – 10.2.112.62	10.2.112.63
9	10.2.112.64/29	10.2.112.65 – 10.2.112.70	10.2.112.71
10	10.2.112.72/29	10.2.112.73 – 10.2.112.78	10.2.112.79
11	10.2.112.80/29	10.2.112.81 – 10.2.112.86	10.2.112.87
12	10.2.112.88/29	10.2.112.89 – 10.2.112.94	10.2.112.95
13	10.2.112.96/29	10.2.112.97 – 10.2.112.102	10.2.112.103
14	10.2.112.104/29	10.2.112.105 – 10.2.112.110	10.2.112.111
15	10.2.112.112/29	10.2.112.113 – 10.2.112.118	10.2.112.119
16	10.2.112.120/29	10.2.112.121 – 10.2.112.126	10.2.112.127
17	10.2.112.128/29	10.2.112.129 – 10.2.112.134	10.2.112.135
18	10.2.112.136/29	10.2.112.137 – 10.2.112.142	10.2.112.143
19	10.2.112.144/29	10.2.112.145 – 10.2.112.150	10.2.112.151
20	10.2.112.152/29	10.2.112.153 – 10.2.112.158	10.2.112.159
21	10.2.112.160/29	10.2.112.161 – 10.2.112.166	10.2.112.167
22	10.2.112.168/29	10.2.112.169 – 10.2.112.174	10.2.112.175
23	10.2.112.176/29	10.2.112.177 – 10.2.112.182	10.2.112.183
24	10.2.112.184/29	10.2.112.185 – 10.2.112.190	10.2.112.191
25	10.2.112.192/29	10.2.112.193 – 10.2.112.198	10.2.112.199
26	10.2.112.200/29	10.2.112.201 – 10.2.112.206	10.2.112.207
27	10.2.112.208/29	10.2.112.209 – 10.2.112.214	10.2.112.215
28	10.2.112.216/29	10.2.112.217 – 10.2.112.222	10.2.112.223
29	10.2.112.224/29	10.2.112.225 – 10.2.112.230	10.2.112.231
30	10.2.112.232/29	10.2.112.233 – 10.2.112.238	10.2.112.239
31	10.2.112.240/29	10.2.112.241 – 10.2.112.246	10.2.112.247
32	10.2.112.248/29	10.2.112.249 – 10.2.112.254	10.2.112.255
33	10.2.113.0/29	10.2.113.1 – 10.2.113.6	10.2.113.7
34	10.2.113.8/29	10.2.113.9 – 10.2.113.14	10.2.113.15
35	10.2.113.16/29	10.2.113.17 – 10.2.113.22	10.2.113.23
36	10.2.113.24/29	10.2.113.25 – 10.2.113.30	10.2.113.31
37	10.2.113.32/29	10.2.113.33 – 10.2.113.38	10.2.113.39
38	10.2.113.40/29	10.2.113.41 – 10.2.113.46	10.2.113.47
39	10.2.113.48/29	10.2.113.49 – 10.2.113.54	10.2.113.55
40	10.2.113.56/29	10.2.113.57 – 10.2.113.62	10.2.113.63
41	10.2.113.64/29	10.2.113.65 – 10.2.113.70	10.2.113.71
42	10.2.113.72/29	10.2.113.73 – 10.2.113.78	10.2.113.79
43	10.2.113.80/29	10.2.113.81 – 10.2.113.86	10.2.113.87
44	10.2.113.88/29	10.2.113.89 – 10.2.113.94	10.2.113.95
45	10.2.113.96/29	10.2.113.97 – 10.2.113.102	10.2.113.103
46	10.2.113.104/29	10.2.113.105 – 10.2.113.110	10.2.113.111
47	10.2.113.112/29	10.2.113.113 – 10.2.113.118	10.2.113.119
48	10.2.113.120/29	10.2.113.121 – 10.2.113.126	10.2.113.127
49	10.2.113.128/29	10.2.113.129 – 10.2.113.134	10.2.113.135
50	10.2.113.136/29	10.2.113.137 – 10.2.113.142	10.2.113.143
51	10.2.113.144/29	10.2.113.145 – 10.2.113.150	10.2.113.151
52	10.2.113.152/29	10.2.113.153 – 10.2.113.158	10.2.113.159
53	10.2.113.160/29	10.2.113.161 – 10.2.113.166	10.2.113.167
54	10.2.113.168/29	10.2.113.169 – 10.2.113.174	10.2.113.175
55	10.2.113.176/29	10.2.113.177 – 10.2.113.182	10.2.113.183
56	10.2.113.184/29	10.2.113.185 – 10.2.113.190	10.2.113.191
57	10.2.113.192/29	10.2.113.193 – 10.2.113.198	10.2.113.199
58	10.2.113.200/29	10.2.113.201 – 10.2.113.206	10.2.113.207
59	10.2.113.208/29	10.2.113.209 – 10.2.113.214	10.2.113.215
60	10.2.113.216/29	10.2.113.217 – 10.2.113.222	10.2.113.223
61	10.2.113.224/29	10.2.113.225 – 10.2.113.230	10.2.113.231
62	10.2.113.232/29	10.2.113.233 – 10.2.113.238	10.2.113.239
63	10.2.113.240/29	10.2.113.241 – 10.2.113.246	10.2.113.247
64	10.2.113.248/29	10.2.113.249 – 10.2.113.254	10.2.113.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →