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)10.1.164.0/23

network10.1.164.0/23

broadcast10.1.165.255

first host10.1.164.1

last host10.1.165.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.164.0/23

address00001010.00000001.10100100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.10100100.00000000

broadcast00001010.00000001.10100101.11111111

green = network part, grey = host part

hex0x0a01a400

decimal167879680

reverse dns0.164.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:a400

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.164.0/29	10.1.164.1 – 10.1.164.6	10.1.164.7
2	10.1.164.8/29	10.1.164.9 – 10.1.164.14	10.1.164.15
3	10.1.164.16/29	10.1.164.17 – 10.1.164.22	10.1.164.23
4	10.1.164.24/29	10.1.164.25 – 10.1.164.30	10.1.164.31
5	10.1.164.32/29	10.1.164.33 – 10.1.164.38	10.1.164.39
6	10.1.164.40/29	10.1.164.41 – 10.1.164.46	10.1.164.47
7	10.1.164.48/29	10.1.164.49 – 10.1.164.54	10.1.164.55
8	10.1.164.56/29	10.1.164.57 – 10.1.164.62	10.1.164.63
9	10.1.164.64/29	10.1.164.65 – 10.1.164.70	10.1.164.71
10	10.1.164.72/29	10.1.164.73 – 10.1.164.78	10.1.164.79
11	10.1.164.80/29	10.1.164.81 – 10.1.164.86	10.1.164.87
12	10.1.164.88/29	10.1.164.89 – 10.1.164.94	10.1.164.95
13	10.1.164.96/29	10.1.164.97 – 10.1.164.102	10.1.164.103
14	10.1.164.104/29	10.1.164.105 – 10.1.164.110	10.1.164.111
15	10.1.164.112/29	10.1.164.113 – 10.1.164.118	10.1.164.119
16	10.1.164.120/29	10.1.164.121 – 10.1.164.126	10.1.164.127
17	10.1.164.128/29	10.1.164.129 – 10.1.164.134	10.1.164.135
18	10.1.164.136/29	10.1.164.137 – 10.1.164.142	10.1.164.143
19	10.1.164.144/29	10.1.164.145 – 10.1.164.150	10.1.164.151
20	10.1.164.152/29	10.1.164.153 – 10.1.164.158	10.1.164.159
21	10.1.164.160/29	10.1.164.161 – 10.1.164.166	10.1.164.167
22	10.1.164.168/29	10.1.164.169 – 10.1.164.174	10.1.164.175
23	10.1.164.176/29	10.1.164.177 – 10.1.164.182	10.1.164.183
24	10.1.164.184/29	10.1.164.185 – 10.1.164.190	10.1.164.191
25	10.1.164.192/29	10.1.164.193 – 10.1.164.198	10.1.164.199
26	10.1.164.200/29	10.1.164.201 – 10.1.164.206	10.1.164.207
27	10.1.164.208/29	10.1.164.209 – 10.1.164.214	10.1.164.215
28	10.1.164.216/29	10.1.164.217 – 10.1.164.222	10.1.164.223
29	10.1.164.224/29	10.1.164.225 – 10.1.164.230	10.1.164.231
30	10.1.164.232/29	10.1.164.233 – 10.1.164.238	10.1.164.239
31	10.1.164.240/29	10.1.164.241 – 10.1.164.246	10.1.164.247
32	10.1.164.248/29	10.1.164.249 – 10.1.164.254	10.1.164.255
33	10.1.165.0/29	10.1.165.1 – 10.1.165.6	10.1.165.7
34	10.1.165.8/29	10.1.165.9 – 10.1.165.14	10.1.165.15
35	10.1.165.16/29	10.1.165.17 – 10.1.165.22	10.1.165.23
36	10.1.165.24/29	10.1.165.25 – 10.1.165.30	10.1.165.31
37	10.1.165.32/29	10.1.165.33 – 10.1.165.38	10.1.165.39
38	10.1.165.40/29	10.1.165.41 – 10.1.165.46	10.1.165.47
39	10.1.165.48/29	10.1.165.49 – 10.1.165.54	10.1.165.55
40	10.1.165.56/29	10.1.165.57 – 10.1.165.62	10.1.165.63
41	10.1.165.64/29	10.1.165.65 – 10.1.165.70	10.1.165.71
42	10.1.165.72/29	10.1.165.73 – 10.1.165.78	10.1.165.79
43	10.1.165.80/29	10.1.165.81 – 10.1.165.86	10.1.165.87
44	10.1.165.88/29	10.1.165.89 – 10.1.165.94	10.1.165.95
45	10.1.165.96/29	10.1.165.97 – 10.1.165.102	10.1.165.103
46	10.1.165.104/29	10.1.165.105 – 10.1.165.110	10.1.165.111
47	10.1.165.112/29	10.1.165.113 – 10.1.165.118	10.1.165.119
48	10.1.165.120/29	10.1.165.121 – 10.1.165.126	10.1.165.127
49	10.1.165.128/29	10.1.165.129 – 10.1.165.134	10.1.165.135
50	10.1.165.136/29	10.1.165.137 – 10.1.165.142	10.1.165.143
51	10.1.165.144/29	10.1.165.145 – 10.1.165.150	10.1.165.151
52	10.1.165.152/29	10.1.165.153 – 10.1.165.158	10.1.165.159
53	10.1.165.160/29	10.1.165.161 – 10.1.165.166	10.1.165.167
54	10.1.165.168/29	10.1.165.169 – 10.1.165.174	10.1.165.175
55	10.1.165.176/29	10.1.165.177 – 10.1.165.182	10.1.165.183
56	10.1.165.184/29	10.1.165.185 – 10.1.165.190	10.1.165.191
57	10.1.165.192/29	10.1.165.193 – 10.1.165.198	10.1.165.199
58	10.1.165.200/29	10.1.165.201 – 10.1.165.206	10.1.165.207
59	10.1.165.208/29	10.1.165.209 – 10.1.165.214	10.1.165.215
60	10.1.165.216/29	10.1.165.217 – 10.1.165.222	10.1.165.223
61	10.1.165.224/29	10.1.165.225 – 10.1.165.230	10.1.165.231
62	10.1.165.232/29	10.1.165.233 – 10.1.165.238	10.1.165.239
63	10.1.165.240/29	10.1.165.241 – 10.1.165.246	10.1.165.247
64	10.1.165.248/29	10.1.165.249 – 10.1.165.254	10.1.165.255

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 →