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)10.4.68.0/23

network10.4.68.0/23

broadcast10.4.69.255

first host10.4.68.1

last host10.4.69.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.4.68.0/23

address00001010.00000100.01000100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000100.01000100.00000000

broadcast00001010.00000100.01000101.11111111

green = network part, grey = host part

hex0x0a044400

decimal168051712

reverse dns0.68.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:4400

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.68.0/29	10.4.68.1 – 10.4.68.6	10.4.68.7
2	10.4.68.8/29	10.4.68.9 – 10.4.68.14	10.4.68.15
3	10.4.68.16/29	10.4.68.17 – 10.4.68.22	10.4.68.23
4	10.4.68.24/29	10.4.68.25 – 10.4.68.30	10.4.68.31
5	10.4.68.32/29	10.4.68.33 – 10.4.68.38	10.4.68.39
6	10.4.68.40/29	10.4.68.41 – 10.4.68.46	10.4.68.47
7	10.4.68.48/29	10.4.68.49 – 10.4.68.54	10.4.68.55
8	10.4.68.56/29	10.4.68.57 – 10.4.68.62	10.4.68.63
9	10.4.68.64/29	10.4.68.65 – 10.4.68.70	10.4.68.71
10	10.4.68.72/29	10.4.68.73 – 10.4.68.78	10.4.68.79
11	10.4.68.80/29	10.4.68.81 – 10.4.68.86	10.4.68.87
12	10.4.68.88/29	10.4.68.89 – 10.4.68.94	10.4.68.95
13	10.4.68.96/29	10.4.68.97 – 10.4.68.102	10.4.68.103
14	10.4.68.104/29	10.4.68.105 – 10.4.68.110	10.4.68.111
15	10.4.68.112/29	10.4.68.113 – 10.4.68.118	10.4.68.119
16	10.4.68.120/29	10.4.68.121 – 10.4.68.126	10.4.68.127
17	10.4.68.128/29	10.4.68.129 – 10.4.68.134	10.4.68.135
18	10.4.68.136/29	10.4.68.137 – 10.4.68.142	10.4.68.143
19	10.4.68.144/29	10.4.68.145 – 10.4.68.150	10.4.68.151
20	10.4.68.152/29	10.4.68.153 – 10.4.68.158	10.4.68.159
21	10.4.68.160/29	10.4.68.161 – 10.4.68.166	10.4.68.167
22	10.4.68.168/29	10.4.68.169 – 10.4.68.174	10.4.68.175
23	10.4.68.176/29	10.4.68.177 – 10.4.68.182	10.4.68.183
24	10.4.68.184/29	10.4.68.185 – 10.4.68.190	10.4.68.191
25	10.4.68.192/29	10.4.68.193 – 10.4.68.198	10.4.68.199
26	10.4.68.200/29	10.4.68.201 – 10.4.68.206	10.4.68.207
27	10.4.68.208/29	10.4.68.209 – 10.4.68.214	10.4.68.215
28	10.4.68.216/29	10.4.68.217 – 10.4.68.222	10.4.68.223
29	10.4.68.224/29	10.4.68.225 – 10.4.68.230	10.4.68.231
30	10.4.68.232/29	10.4.68.233 – 10.4.68.238	10.4.68.239
31	10.4.68.240/29	10.4.68.241 – 10.4.68.246	10.4.68.247
32	10.4.68.248/29	10.4.68.249 – 10.4.68.254	10.4.68.255
33	10.4.69.0/29	10.4.69.1 – 10.4.69.6	10.4.69.7
34	10.4.69.8/29	10.4.69.9 – 10.4.69.14	10.4.69.15
35	10.4.69.16/29	10.4.69.17 – 10.4.69.22	10.4.69.23
36	10.4.69.24/29	10.4.69.25 – 10.4.69.30	10.4.69.31
37	10.4.69.32/29	10.4.69.33 – 10.4.69.38	10.4.69.39
38	10.4.69.40/29	10.4.69.41 – 10.4.69.46	10.4.69.47
39	10.4.69.48/29	10.4.69.49 – 10.4.69.54	10.4.69.55
40	10.4.69.56/29	10.4.69.57 – 10.4.69.62	10.4.69.63
41	10.4.69.64/29	10.4.69.65 – 10.4.69.70	10.4.69.71
42	10.4.69.72/29	10.4.69.73 – 10.4.69.78	10.4.69.79
43	10.4.69.80/29	10.4.69.81 – 10.4.69.86	10.4.69.87
44	10.4.69.88/29	10.4.69.89 – 10.4.69.94	10.4.69.95
45	10.4.69.96/29	10.4.69.97 – 10.4.69.102	10.4.69.103
46	10.4.69.104/29	10.4.69.105 – 10.4.69.110	10.4.69.111
47	10.4.69.112/29	10.4.69.113 – 10.4.69.118	10.4.69.119
48	10.4.69.120/29	10.4.69.121 – 10.4.69.126	10.4.69.127
49	10.4.69.128/29	10.4.69.129 – 10.4.69.134	10.4.69.135
50	10.4.69.136/29	10.4.69.137 – 10.4.69.142	10.4.69.143
51	10.4.69.144/29	10.4.69.145 – 10.4.69.150	10.4.69.151
52	10.4.69.152/29	10.4.69.153 – 10.4.69.158	10.4.69.159
53	10.4.69.160/29	10.4.69.161 – 10.4.69.166	10.4.69.167
54	10.4.69.168/29	10.4.69.169 – 10.4.69.174	10.4.69.175
55	10.4.69.176/29	10.4.69.177 – 10.4.69.182	10.4.69.183
56	10.4.69.184/29	10.4.69.185 – 10.4.69.190	10.4.69.191
57	10.4.69.192/29	10.4.69.193 – 10.4.69.198	10.4.69.199
58	10.4.69.200/29	10.4.69.201 – 10.4.69.206	10.4.69.207
59	10.4.69.208/29	10.4.69.209 – 10.4.69.214	10.4.69.215
60	10.4.69.216/29	10.4.69.217 – 10.4.69.222	10.4.69.223
61	10.4.69.224/29	10.4.69.225 – 10.4.69.230	10.4.69.231
62	10.4.69.232/29	10.4.69.233 – 10.4.69.238	10.4.69.239
63	10.4.69.240/29	10.4.69.241 – 10.4.69.246	10.4.69.247
64	10.4.69.248/29	10.4.69.249 – 10.4.69.254	10.4.69.255

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 →