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)10.167.128.0/23

network10.167.128.0/23

broadcast10.167.129.255

first host10.167.128.1

last host10.167.129.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.128.0/23

address00001010.10100111.10000000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.10000000.00000000

broadcast00001010.10100111.10000001.11111111

green = network part, grey = host part

hex0x0aa78000

decimal178749440

reverse dns0.128.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.128.0/29	10.167.128.1 – 10.167.128.6	10.167.128.7
2	10.167.128.8/29	10.167.128.9 – 10.167.128.14	10.167.128.15
3	10.167.128.16/29	10.167.128.17 – 10.167.128.22	10.167.128.23
4	10.167.128.24/29	10.167.128.25 – 10.167.128.30	10.167.128.31
5	10.167.128.32/29	10.167.128.33 – 10.167.128.38	10.167.128.39
6	10.167.128.40/29	10.167.128.41 – 10.167.128.46	10.167.128.47
7	10.167.128.48/29	10.167.128.49 – 10.167.128.54	10.167.128.55
8	10.167.128.56/29	10.167.128.57 – 10.167.128.62	10.167.128.63
9	10.167.128.64/29	10.167.128.65 – 10.167.128.70	10.167.128.71
10	10.167.128.72/29	10.167.128.73 – 10.167.128.78	10.167.128.79
11	10.167.128.80/29	10.167.128.81 – 10.167.128.86	10.167.128.87
12	10.167.128.88/29	10.167.128.89 – 10.167.128.94	10.167.128.95
13	10.167.128.96/29	10.167.128.97 – 10.167.128.102	10.167.128.103
14	10.167.128.104/29	10.167.128.105 – 10.167.128.110	10.167.128.111
15	10.167.128.112/29	10.167.128.113 – 10.167.128.118	10.167.128.119
16	10.167.128.120/29	10.167.128.121 – 10.167.128.126	10.167.128.127
17	10.167.128.128/29	10.167.128.129 – 10.167.128.134	10.167.128.135
18	10.167.128.136/29	10.167.128.137 – 10.167.128.142	10.167.128.143
19	10.167.128.144/29	10.167.128.145 – 10.167.128.150	10.167.128.151
20	10.167.128.152/29	10.167.128.153 – 10.167.128.158	10.167.128.159
21	10.167.128.160/29	10.167.128.161 – 10.167.128.166	10.167.128.167
22	10.167.128.168/29	10.167.128.169 – 10.167.128.174	10.167.128.175
23	10.167.128.176/29	10.167.128.177 – 10.167.128.182	10.167.128.183
24	10.167.128.184/29	10.167.128.185 – 10.167.128.190	10.167.128.191
25	10.167.128.192/29	10.167.128.193 – 10.167.128.198	10.167.128.199
26	10.167.128.200/29	10.167.128.201 – 10.167.128.206	10.167.128.207
27	10.167.128.208/29	10.167.128.209 – 10.167.128.214	10.167.128.215
28	10.167.128.216/29	10.167.128.217 – 10.167.128.222	10.167.128.223
29	10.167.128.224/29	10.167.128.225 – 10.167.128.230	10.167.128.231
30	10.167.128.232/29	10.167.128.233 – 10.167.128.238	10.167.128.239
31	10.167.128.240/29	10.167.128.241 – 10.167.128.246	10.167.128.247
32	10.167.128.248/29	10.167.128.249 – 10.167.128.254	10.167.128.255
33	10.167.129.0/29	10.167.129.1 – 10.167.129.6	10.167.129.7
34	10.167.129.8/29	10.167.129.9 – 10.167.129.14	10.167.129.15
35	10.167.129.16/29	10.167.129.17 – 10.167.129.22	10.167.129.23
36	10.167.129.24/29	10.167.129.25 – 10.167.129.30	10.167.129.31
37	10.167.129.32/29	10.167.129.33 – 10.167.129.38	10.167.129.39
38	10.167.129.40/29	10.167.129.41 – 10.167.129.46	10.167.129.47
39	10.167.129.48/29	10.167.129.49 – 10.167.129.54	10.167.129.55
40	10.167.129.56/29	10.167.129.57 – 10.167.129.62	10.167.129.63
41	10.167.129.64/29	10.167.129.65 – 10.167.129.70	10.167.129.71
42	10.167.129.72/29	10.167.129.73 – 10.167.129.78	10.167.129.79
43	10.167.129.80/29	10.167.129.81 – 10.167.129.86	10.167.129.87
44	10.167.129.88/29	10.167.129.89 – 10.167.129.94	10.167.129.95
45	10.167.129.96/29	10.167.129.97 – 10.167.129.102	10.167.129.103
46	10.167.129.104/29	10.167.129.105 – 10.167.129.110	10.167.129.111
47	10.167.129.112/29	10.167.129.113 – 10.167.129.118	10.167.129.119
48	10.167.129.120/29	10.167.129.121 – 10.167.129.126	10.167.129.127
49	10.167.129.128/29	10.167.129.129 – 10.167.129.134	10.167.129.135
50	10.167.129.136/29	10.167.129.137 – 10.167.129.142	10.167.129.143
51	10.167.129.144/29	10.167.129.145 – 10.167.129.150	10.167.129.151
52	10.167.129.152/29	10.167.129.153 – 10.167.129.158	10.167.129.159
53	10.167.129.160/29	10.167.129.161 – 10.167.129.166	10.167.129.167
54	10.167.129.168/29	10.167.129.169 – 10.167.129.174	10.167.129.175
55	10.167.129.176/29	10.167.129.177 – 10.167.129.182	10.167.129.183
56	10.167.129.184/29	10.167.129.185 – 10.167.129.190	10.167.129.191
57	10.167.129.192/29	10.167.129.193 – 10.167.129.198	10.167.129.199
58	10.167.129.200/29	10.167.129.201 – 10.167.129.206	10.167.129.207
59	10.167.129.208/29	10.167.129.209 – 10.167.129.214	10.167.129.215
60	10.167.129.216/29	10.167.129.217 – 10.167.129.222	10.167.129.223
61	10.167.129.224/29	10.167.129.225 – 10.167.129.230	10.167.129.231
62	10.167.129.232/29	10.167.129.233 – 10.167.129.238	10.167.129.239
63	10.167.129.240/29	10.167.129.241 – 10.167.129.246	10.167.129.247
64	10.167.129.248/29	10.167.129.249 – 10.167.129.254	10.167.129.255

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 →