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)10.2.192.0/23

network10.2.192.0/23

broadcast10.2.193.255

first host10.2.192.1

last host10.2.193.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.192.0/23

address00001010.00000010.11000000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11000000.00000000

broadcast00001010.00000010.11000001.11111111

green = network part, grey = host part

hex0x0a02c000

decimal167952384

reverse dns0.192.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.192.0/29	10.2.192.1 – 10.2.192.6	10.2.192.7
2	10.2.192.8/29	10.2.192.9 – 10.2.192.14	10.2.192.15
3	10.2.192.16/29	10.2.192.17 – 10.2.192.22	10.2.192.23
4	10.2.192.24/29	10.2.192.25 – 10.2.192.30	10.2.192.31
5	10.2.192.32/29	10.2.192.33 – 10.2.192.38	10.2.192.39
6	10.2.192.40/29	10.2.192.41 – 10.2.192.46	10.2.192.47
7	10.2.192.48/29	10.2.192.49 – 10.2.192.54	10.2.192.55
8	10.2.192.56/29	10.2.192.57 – 10.2.192.62	10.2.192.63
9	10.2.192.64/29	10.2.192.65 – 10.2.192.70	10.2.192.71
10	10.2.192.72/29	10.2.192.73 – 10.2.192.78	10.2.192.79
11	10.2.192.80/29	10.2.192.81 – 10.2.192.86	10.2.192.87
12	10.2.192.88/29	10.2.192.89 – 10.2.192.94	10.2.192.95
13	10.2.192.96/29	10.2.192.97 – 10.2.192.102	10.2.192.103
14	10.2.192.104/29	10.2.192.105 – 10.2.192.110	10.2.192.111
15	10.2.192.112/29	10.2.192.113 – 10.2.192.118	10.2.192.119
16	10.2.192.120/29	10.2.192.121 – 10.2.192.126	10.2.192.127
17	10.2.192.128/29	10.2.192.129 – 10.2.192.134	10.2.192.135
18	10.2.192.136/29	10.2.192.137 – 10.2.192.142	10.2.192.143
19	10.2.192.144/29	10.2.192.145 – 10.2.192.150	10.2.192.151
20	10.2.192.152/29	10.2.192.153 – 10.2.192.158	10.2.192.159
21	10.2.192.160/29	10.2.192.161 – 10.2.192.166	10.2.192.167
22	10.2.192.168/29	10.2.192.169 – 10.2.192.174	10.2.192.175
23	10.2.192.176/29	10.2.192.177 – 10.2.192.182	10.2.192.183
24	10.2.192.184/29	10.2.192.185 – 10.2.192.190	10.2.192.191
25	10.2.192.192/29	10.2.192.193 – 10.2.192.198	10.2.192.199
26	10.2.192.200/29	10.2.192.201 – 10.2.192.206	10.2.192.207
27	10.2.192.208/29	10.2.192.209 – 10.2.192.214	10.2.192.215
28	10.2.192.216/29	10.2.192.217 – 10.2.192.222	10.2.192.223
29	10.2.192.224/29	10.2.192.225 – 10.2.192.230	10.2.192.231
30	10.2.192.232/29	10.2.192.233 – 10.2.192.238	10.2.192.239
31	10.2.192.240/29	10.2.192.241 – 10.2.192.246	10.2.192.247
32	10.2.192.248/29	10.2.192.249 – 10.2.192.254	10.2.192.255
33	10.2.193.0/29	10.2.193.1 – 10.2.193.6	10.2.193.7
34	10.2.193.8/29	10.2.193.9 – 10.2.193.14	10.2.193.15
35	10.2.193.16/29	10.2.193.17 – 10.2.193.22	10.2.193.23
36	10.2.193.24/29	10.2.193.25 – 10.2.193.30	10.2.193.31
37	10.2.193.32/29	10.2.193.33 – 10.2.193.38	10.2.193.39
38	10.2.193.40/29	10.2.193.41 – 10.2.193.46	10.2.193.47
39	10.2.193.48/29	10.2.193.49 – 10.2.193.54	10.2.193.55
40	10.2.193.56/29	10.2.193.57 – 10.2.193.62	10.2.193.63
41	10.2.193.64/29	10.2.193.65 – 10.2.193.70	10.2.193.71
42	10.2.193.72/29	10.2.193.73 – 10.2.193.78	10.2.193.79
43	10.2.193.80/29	10.2.193.81 – 10.2.193.86	10.2.193.87
44	10.2.193.88/29	10.2.193.89 – 10.2.193.94	10.2.193.95
45	10.2.193.96/29	10.2.193.97 – 10.2.193.102	10.2.193.103
46	10.2.193.104/29	10.2.193.105 – 10.2.193.110	10.2.193.111
47	10.2.193.112/29	10.2.193.113 – 10.2.193.118	10.2.193.119
48	10.2.193.120/29	10.2.193.121 – 10.2.193.126	10.2.193.127
49	10.2.193.128/29	10.2.193.129 – 10.2.193.134	10.2.193.135
50	10.2.193.136/29	10.2.193.137 – 10.2.193.142	10.2.193.143
51	10.2.193.144/29	10.2.193.145 – 10.2.193.150	10.2.193.151
52	10.2.193.152/29	10.2.193.153 – 10.2.193.158	10.2.193.159
53	10.2.193.160/29	10.2.193.161 – 10.2.193.166	10.2.193.167
54	10.2.193.168/29	10.2.193.169 – 10.2.193.174	10.2.193.175
55	10.2.193.176/29	10.2.193.177 – 10.2.193.182	10.2.193.183
56	10.2.193.184/29	10.2.193.185 – 10.2.193.190	10.2.193.191
57	10.2.193.192/29	10.2.193.193 – 10.2.193.198	10.2.193.199
58	10.2.193.200/29	10.2.193.201 – 10.2.193.206	10.2.193.207
59	10.2.193.208/29	10.2.193.209 – 10.2.193.214	10.2.193.215
60	10.2.193.216/29	10.2.193.217 – 10.2.193.222	10.2.193.223
61	10.2.193.224/29	10.2.193.225 – 10.2.193.230	10.2.193.231
62	10.2.193.232/29	10.2.193.233 – 10.2.193.238	10.2.193.239
63	10.2.193.240/29	10.2.193.241 – 10.2.193.246	10.2.193.247
64	10.2.193.248/29	10.2.193.249 – 10.2.193.254	10.2.193.255

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 →