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)10.167.102.0/23

network10.167.102.0/23

broadcast10.167.103.255

first host10.167.102.1

last host10.167.103.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.102.0/23

address00001010.10100111.01100110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.01100110.00000000

broadcast00001010.10100111.01100111.11111111

green = network part, grey = host part

hex0x0aa76600

decimal178742784

reverse dns0.102.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:6600

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.102.0/29	10.167.102.1 – 10.167.102.6	10.167.102.7
2	10.167.102.8/29	10.167.102.9 – 10.167.102.14	10.167.102.15
3	10.167.102.16/29	10.167.102.17 – 10.167.102.22	10.167.102.23
4	10.167.102.24/29	10.167.102.25 – 10.167.102.30	10.167.102.31
5	10.167.102.32/29	10.167.102.33 – 10.167.102.38	10.167.102.39
6	10.167.102.40/29	10.167.102.41 – 10.167.102.46	10.167.102.47
7	10.167.102.48/29	10.167.102.49 – 10.167.102.54	10.167.102.55
8	10.167.102.56/29	10.167.102.57 – 10.167.102.62	10.167.102.63
9	10.167.102.64/29	10.167.102.65 – 10.167.102.70	10.167.102.71
10	10.167.102.72/29	10.167.102.73 – 10.167.102.78	10.167.102.79
11	10.167.102.80/29	10.167.102.81 – 10.167.102.86	10.167.102.87
12	10.167.102.88/29	10.167.102.89 – 10.167.102.94	10.167.102.95
13	10.167.102.96/29	10.167.102.97 – 10.167.102.102	10.167.102.103
14	10.167.102.104/29	10.167.102.105 – 10.167.102.110	10.167.102.111
15	10.167.102.112/29	10.167.102.113 – 10.167.102.118	10.167.102.119
16	10.167.102.120/29	10.167.102.121 – 10.167.102.126	10.167.102.127
17	10.167.102.128/29	10.167.102.129 – 10.167.102.134	10.167.102.135
18	10.167.102.136/29	10.167.102.137 – 10.167.102.142	10.167.102.143
19	10.167.102.144/29	10.167.102.145 – 10.167.102.150	10.167.102.151
20	10.167.102.152/29	10.167.102.153 – 10.167.102.158	10.167.102.159
21	10.167.102.160/29	10.167.102.161 – 10.167.102.166	10.167.102.167
22	10.167.102.168/29	10.167.102.169 – 10.167.102.174	10.167.102.175
23	10.167.102.176/29	10.167.102.177 – 10.167.102.182	10.167.102.183
24	10.167.102.184/29	10.167.102.185 – 10.167.102.190	10.167.102.191
25	10.167.102.192/29	10.167.102.193 – 10.167.102.198	10.167.102.199
26	10.167.102.200/29	10.167.102.201 – 10.167.102.206	10.167.102.207
27	10.167.102.208/29	10.167.102.209 – 10.167.102.214	10.167.102.215
28	10.167.102.216/29	10.167.102.217 – 10.167.102.222	10.167.102.223
29	10.167.102.224/29	10.167.102.225 – 10.167.102.230	10.167.102.231
30	10.167.102.232/29	10.167.102.233 – 10.167.102.238	10.167.102.239
31	10.167.102.240/29	10.167.102.241 – 10.167.102.246	10.167.102.247
32	10.167.102.248/29	10.167.102.249 – 10.167.102.254	10.167.102.255
33	10.167.103.0/29	10.167.103.1 – 10.167.103.6	10.167.103.7
34	10.167.103.8/29	10.167.103.9 – 10.167.103.14	10.167.103.15
35	10.167.103.16/29	10.167.103.17 – 10.167.103.22	10.167.103.23
36	10.167.103.24/29	10.167.103.25 – 10.167.103.30	10.167.103.31
37	10.167.103.32/29	10.167.103.33 – 10.167.103.38	10.167.103.39
38	10.167.103.40/29	10.167.103.41 – 10.167.103.46	10.167.103.47
39	10.167.103.48/29	10.167.103.49 – 10.167.103.54	10.167.103.55
40	10.167.103.56/29	10.167.103.57 – 10.167.103.62	10.167.103.63
41	10.167.103.64/29	10.167.103.65 – 10.167.103.70	10.167.103.71
42	10.167.103.72/29	10.167.103.73 – 10.167.103.78	10.167.103.79
43	10.167.103.80/29	10.167.103.81 – 10.167.103.86	10.167.103.87
44	10.167.103.88/29	10.167.103.89 – 10.167.103.94	10.167.103.95
45	10.167.103.96/29	10.167.103.97 – 10.167.103.102	10.167.103.103
46	10.167.103.104/29	10.167.103.105 – 10.167.103.110	10.167.103.111
47	10.167.103.112/29	10.167.103.113 – 10.167.103.118	10.167.103.119
48	10.167.103.120/29	10.167.103.121 – 10.167.103.126	10.167.103.127
49	10.167.103.128/29	10.167.103.129 – 10.167.103.134	10.167.103.135
50	10.167.103.136/29	10.167.103.137 – 10.167.103.142	10.167.103.143
51	10.167.103.144/29	10.167.103.145 – 10.167.103.150	10.167.103.151
52	10.167.103.152/29	10.167.103.153 – 10.167.103.158	10.167.103.159
53	10.167.103.160/29	10.167.103.161 – 10.167.103.166	10.167.103.167
54	10.167.103.168/29	10.167.103.169 – 10.167.103.174	10.167.103.175
55	10.167.103.176/29	10.167.103.177 – 10.167.103.182	10.167.103.183
56	10.167.103.184/29	10.167.103.185 – 10.167.103.190	10.167.103.191
57	10.167.103.192/29	10.167.103.193 – 10.167.103.198	10.167.103.199
58	10.167.103.200/29	10.167.103.201 – 10.167.103.206	10.167.103.207
59	10.167.103.208/29	10.167.103.209 – 10.167.103.214	10.167.103.215
60	10.167.103.216/29	10.167.103.217 – 10.167.103.222	10.167.103.223
61	10.167.103.224/29	10.167.103.225 – 10.167.103.230	10.167.103.231
62	10.167.103.232/29	10.167.103.233 – 10.167.103.238	10.167.103.239
63	10.167.103.240/29	10.167.103.241 – 10.167.103.246	10.167.103.247
64	10.167.103.248/29	10.167.103.249 – 10.167.103.254	10.167.103.255

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 →