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)10.158.78.0/23

network10.158.78.0/23

broadcast10.158.79.255

first host10.158.78.1

last host10.158.79.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.158.78.0/23

address00001010.10011110.01001110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10011110.01001110.00000000

broadcast00001010.10011110.01001111.11111111

green = network part, grey = host part

hex0x0a9e4e00

decimal178146816

reverse dns0.78.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:4e00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.158.78.0/29	10.158.78.1 – 10.158.78.6	10.158.78.7
2	10.158.78.8/29	10.158.78.9 – 10.158.78.14	10.158.78.15
3	10.158.78.16/29	10.158.78.17 – 10.158.78.22	10.158.78.23
4	10.158.78.24/29	10.158.78.25 – 10.158.78.30	10.158.78.31
5	10.158.78.32/29	10.158.78.33 – 10.158.78.38	10.158.78.39
6	10.158.78.40/29	10.158.78.41 – 10.158.78.46	10.158.78.47
7	10.158.78.48/29	10.158.78.49 – 10.158.78.54	10.158.78.55
8	10.158.78.56/29	10.158.78.57 – 10.158.78.62	10.158.78.63
9	10.158.78.64/29	10.158.78.65 – 10.158.78.70	10.158.78.71
10	10.158.78.72/29	10.158.78.73 – 10.158.78.78	10.158.78.79
11	10.158.78.80/29	10.158.78.81 – 10.158.78.86	10.158.78.87
12	10.158.78.88/29	10.158.78.89 – 10.158.78.94	10.158.78.95
13	10.158.78.96/29	10.158.78.97 – 10.158.78.102	10.158.78.103
14	10.158.78.104/29	10.158.78.105 – 10.158.78.110	10.158.78.111
15	10.158.78.112/29	10.158.78.113 – 10.158.78.118	10.158.78.119
16	10.158.78.120/29	10.158.78.121 – 10.158.78.126	10.158.78.127
17	10.158.78.128/29	10.158.78.129 – 10.158.78.134	10.158.78.135
18	10.158.78.136/29	10.158.78.137 – 10.158.78.142	10.158.78.143
19	10.158.78.144/29	10.158.78.145 – 10.158.78.150	10.158.78.151
20	10.158.78.152/29	10.158.78.153 – 10.158.78.158	10.158.78.159
21	10.158.78.160/29	10.158.78.161 – 10.158.78.166	10.158.78.167
22	10.158.78.168/29	10.158.78.169 – 10.158.78.174	10.158.78.175
23	10.158.78.176/29	10.158.78.177 – 10.158.78.182	10.158.78.183
24	10.158.78.184/29	10.158.78.185 – 10.158.78.190	10.158.78.191
25	10.158.78.192/29	10.158.78.193 – 10.158.78.198	10.158.78.199
26	10.158.78.200/29	10.158.78.201 – 10.158.78.206	10.158.78.207
27	10.158.78.208/29	10.158.78.209 – 10.158.78.214	10.158.78.215
28	10.158.78.216/29	10.158.78.217 – 10.158.78.222	10.158.78.223
29	10.158.78.224/29	10.158.78.225 – 10.158.78.230	10.158.78.231
30	10.158.78.232/29	10.158.78.233 – 10.158.78.238	10.158.78.239
31	10.158.78.240/29	10.158.78.241 – 10.158.78.246	10.158.78.247
32	10.158.78.248/29	10.158.78.249 – 10.158.78.254	10.158.78.255
33	10.158.79.0/29	10.158.79.1 – 10.158.79.6	10.158.79.7
34	10.158.79.8/29	10.158.79.9 – 10.158.79.14	10.158.79.15
35	10.158.79.16/29	10.158.79.17 – 10.158.79.22	10.158.79.23
36	10.158.79.24/29	10.158.79.25 – 10.158.79.30	10.158.79.31
37	10.158.79.32/29	10.158.79.33 – 10.158.79.38	10.158.79.39
38	10.158.79.40/29	10.158.79.41 – 10.158.79.46	10.158.79.47
39	10.158.79.48/29	10.158.79.49 – 10.158.79.54	10.158.79.55
40	10.158.79.56/29	10.158.79.57 – 10.158.79.62	10.158.79.63
41	10.158.79.64/29	10.158.79.65 – 10.158.79.70	10.158.79.71
42	10.158.79.72/29	10.158.79.73 – 10.158.79.78	10.158.79.79
43	10.158.79.80/29	10.158.79.81 – 10.158.79.86	10.158.79.87
44	10.158.79.88/29	10.158.79.89 – 10.158.79.94	10.158.79.95
45	10.158.79.96/29	10.158.79.97 – 10.158.79.102	10.158.79.103
46	10.158.79.104/29	10.158.79.105 – 10.158.79.110	10.158.79.111
47	10.158.79.112/29	10.158.79.113 – 10.158.79.118	10.158.79.119
48	10.158.79.120/29	10.158.79.121 – 10.158.79.126	10.158.79.127
49	10.158.79.128/29	10.158.79.129 – 10.158.79.134	10.158.79.135
50	10.158.79.136/29	10.158.79.137 – 10.158.79.142	10.158.79.143
51	10.158.79.144/29	10.158.79.145 – 10.158.79.150	10.158.79.151
52	10.158.79.152/29	10.158.79.153 – 10.158.79.158	10.158.79.159
53	10.158.79.160/29	10.158.79.161 – 10.158.79.166	10.158.79.167
54	10.158.79.168/29	10.158.79.169 – 10.158.79.174	10.158.79.175
55	10.158.79.176/29	10.158.79.177 – 10.158.79.182	10.158.79.183
56	10.158.79.184/29	10.158.79.185 – 10.158.79.190	10.158.79.191
57	10.158.79.192/29	10.158.79.193 – 10.158.79.198	10.158.79.199
58	10.158.79.200/29	10.158.79.201 – 10.158.79.206	10.158.79.207
59	10.158.79.208/29	10.158.79.209 – 10.158.79.214	10.158.79.215
60	10.158.79.216/29	10.158.79.217 – 10.158.79.222	10.158.79.223
61	10.158.79.224/29	10.158.79.225 – 10.158.79.230	10.158.79.231
62	10.158.79.232/29	10.158.79.233 – 10.158.79.238	10.158.79.239
63	10.158.79.240/29	10.158.79.241 – 10.158.79.246	10.158.79.247
64	10.158.79.248/29	10.158.79.249 – 10.158.79.254	10.158.79.255

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 →