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)10.78.96.0/23

network10.78.96.0/23

broadcast10.78.97.255

first host10.78.96.1

last host10.78.97.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.78.96.0/23

address00001010.01001110.01100000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001110.01100000.00000000

broadcast00001010.01001110.01100001.11111111

green = network part, grey = host part

hex0x0a4e6000

decimal172908544

reverse dns0.96.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:6000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.78.96.0/29	10.78.96.1 – 10.78.96.6	10.78.96.7
2	10.78.96.8/29	10.78.96.9 – 10.78.96.14	10.78.96.15
3	10.78.96.16/29	10.78.96.17 – 10.78.96.22	10.78.96.23
4	10.78.96.24/29	10.78.96.25 – 10.78.96.30	10.78.96.31
5	10.78.96.32/29	10.78.96.33 – 10.78.96.38	10.78.96.39
6	10.78.96.40/29	10.78.96.41 – 10.78.96.46	10.78.96.47
7	10.78.96.48/29	10.78.96.49 – 10.78.96.54	10.78.96.55
8	10.78.96.56/29	10.78.96.57 – 10.78.96.62	10.78.96.63
9	10.78.96.64/29	10.78.96.65 – 10.78.96.70	10.78.96.71
10	10.78.96.72/29	10.78.96.73 – 10.78.96.78	10.78.96.79
11	10.78.96.80/29	10.78.96.81 – 10.78.96.86	10.78.96.87
12	10.78.96.88/29	10.78.96.89 – 10.78.96.94	10.78.96.95
13	10.78.96.96/29	10.78.96.97 – 10.78.96.102	10.78.96.103
14	10.78.96.104/29	10.78.96.105 – 10.78.96.110	10.78.96.111
15	10.78.96.112/29	10.78.96.113 – 10.78.96.118	10.78.96.119
16	10.78.96.120/29	10.78.96.121 – 10.78.96.126	10.78.96.127
17	10.78.96.128/29	10.78.96.129 – 10.78.96.134	10.78.96.135
18	10.78.96.136/29	10.78.96.137 – 10.78.96.142	10.78.96.143
19	10.78.96.144/29	10.78.96.145 – 10.78.96.150	10.78.96.151
20	10.78.96.152/29	10.78.96.153 – 10.78.96.158	10.78.96.159
21	10.78.96.160/29	10.78.96.161 – 10.78.96.166	10.78.96.167
22	10.78.96.168/29	10.78.96.169 – 10.78.96.174	10.78.96.175
23	10.78.96.176/29	10.78.96.177 – 10.78.96.182	10.78.96.183
24	10.78.96.184/29	10.78.96.185 – 10.78.96.190	10.78.96.191
25	10.78.96.192/29	10.78.96.193 – 10.78.96.198	10.78.96.199
26	10.78.96.200/29	10.78.96.201 – 10.78.96.206	10.78.96.207
27	10.78.96.208/29	10.78.96.209 – 10.78.96.214	10.78.96.215
28	10.78.96.216/29	10.78.96.217 – 10.78.96.222	10.78.96.223
29	10.78.96.224/29	10.78.96.225 – 10.78.96.230	10.78.96.231
30	10.78.96.232/29	10.78.96.233 – 10.78.96.238	10.78.96.239
31	10.78.96.240/29	10.78.96.241 – 10.78.96.246	10.78.96.247
32	10.78.96.248/29	10.78.96.249 – 10.78.96.254	10.78.96.255
33	10.78.97.0/29	10.78.97.1 – 10.78.97.6	10.78.97.7
34	10.78.97.8/29	10.78.97.9 – 10.78.97.14	10.78.97.15
35	10.78.97.16/29	10.78.97.17 – 10.78.97.22	10.78.97.23
36	10.78.97.24/29	10.78.97.25 – 10.78.97.30	10.78.97.31
37	10.78.97.32/29	10.78.97.33 – 10.78.97.38	10.78.97.39
38	10.78.97.40/29	10.78.97.41 – 10.78.97.46	10.78.97.47
39	10.78.97.48/29	10.78.97.49 – 10.78.97.54	10.78.97.55
40	10.78.97.56/29	10.78.97.57 – 10.78.97.62	10.78.97.63
41	10.78.97.64/29	10.78.97.65 – 10.78.97.70	10.78.97.71
42	10.78.97.72/29	10.78.97.73 – 10.78.97.78	10.78.97.79
43	10.78.97.80/29	10.78.97.81 – 10.78.97.86	10.78.97.87
44	10.78.97.88/29	10.78.97.89 – 10.78.97.94	10.78.97.95
45	10.78.97.96/29	10.78.97.97 – 10.78.97.102	10.78.97.103
46	10.78.97.104/29	10.78.97.105 – 10.78.97.110	10.78.97.111
47	10.78.97.112/29	10.78.97.113 – 10.78.97.118	10.78.97.119
48	10.78.97.120/29	10.78.97.121 – 10.78.97.126	10.78.97.127
49	10.78.97.128/29	10.78.97.129 – 10.78.97.134	10.78.97.135
50	10.78.97.136/29	10.78.97.137 – 10.78.97.142	10.78.97.143
51	10.78.97.144/29	10.78.97.145 – 10.78.97.150	10.78.97.151
52	10.78.97.152/29	10.78.97.153 – 10.78.97.158	10.78.97.159
53	10.78.97.160/29	10.78.97.161 – 10.78.97.166	10.78.97.167
54	10.78.97.168/29	10.78.97.169 – 10.78.97.174	10.78.97.175
55	10.78.97.176/29	10.78.97.177 – 10.78.97.182	10.78.97.183
56	10.78.97.184/29	10.78.97.185 – 10.78.97.190	10.78.97.191
57	10.78.97.192/29	10.78.97.193 – 10.78.97.198	10.78.97.199
58	10.78.97.200/29	10.78.97.201 – 10.78.97.206	10.78.97.207
59	10.78.97.208/29	10.78.97.209 – 10.78.97.214	10.78.97.215
60	10.78.97.216/29	10.78.97.217 – 10.78.97.222	10.78.97.223
61	10.78.97.224/29	10.78.97.225 – 10.78.97.230	10.78.97.231
62	10.78.97.232/29	10.78.97.233 – 10.78.97.238	10.78.97.239
63	10.78.97.240/29	10.78.97.241 – 10.78.97.246	10.78.97.247
64	10.78.97.248/29	10.78.97.249 – 10.78.97.254	10.78.97.255

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 →