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)10.1.228.0/23

network10.1.228.0/23

broadcast10.1.229.255

first host10.1.228.1

last host10.1.229.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.228.0/23

address00001010.00000001.11100100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.11100100.00000000

broadcast00001010.00000001.11100101.11111111

green = network part, grey = host part

hex0x0a01e400

decimal167896064

reverse dns0.228.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:e400

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.228.0/29	10.1.228.1 – 10.1.228.6	10.1.228.7
2	10.1.228.8/29	10.1.228.9 – 10.1.228.14	10.1.228.15
3	10.1.228.16/29	10.1.228.17 – 10.1.228.22	10.1.228.23
4	10.1.228.24/29	10.1.228.25 – 10.1.228.30	10.1.228.31
5	10.1.228.32/29	10.1.228.33 – 10.1.228.38	10.1.228.39
6	10.1.228.40/29	10.1.228.41 – 10.1.228.46	10.1.228.47
7	10.1.228.48/29	10.1.228.49 – 10.1.228.54	10.1.228.55
8	10.1.228.56/29	10.1.228.57 – 10.1.228.62	10.1.228.63
9	10.1.228.64/29	10.1.228.65 – 10.1.228.70	10.1.228.71
10	10.1.228.72/29	10.1.228.73 – 10.1.228.78	10.1.228.79
11	10.1.228.80/29	10.1.228.81 – 10.1.228.86	10.1.228.87
12	10.1.228.88/29	10.1.228.89 – 10.1.228.94	10.1.228.95
13	10.1.228.96/29	10.1.228.97 – 10.1.228.102	10.1.228.103
14	10.1.228.104/29	10.1.228.105 – 10.1.228.110	10.1.228.111
15	10.1.228.112/29	10.1.228.113 – 10.1.228.118	10.1.228.119
16	10.1.228.120/29	10.1.228.121 – 10.1.228.126	10.1.228.127
17	10.1.228.128/29	10.1.228.129 – 10.1.228.134	10.1.228.135
18	10.1.228.136/29	10.1.228.137 – 10.1.228.142	10.1.228.143
19	10.1.228.144/29	10.1.228.145 – 10.1.228.150	10.1.228.151
20	10.1.228.152/29	10.1.228.153 – 10.1.228.158	10.1.228.159
21	10.1.228.160/29	10.1.228.161 – 10.1.228.166	10.1.228.167
22	10.1.228.168/29	10.1.228.169 – 10.1.228.174	10.1.228.175
23	10.1.228.176/29	10.1.228.177 – 10.1.228.182	10.1.228.183
24	10.1.228.184/29	10.1.228.185 – 10.1.228.190	10.1.228.191
25	10.1.228.192/29	10.1.228.193 – 10.1.228.198	10.1.228.199
26	10.1.228.200/29	10.1.228.201 – 10.1.228.206	10.1.228.207
27	10.1.228.208/29	10.1.228.209 – 10.1.228.214	10.1.228.215
28	10.1.228.216/29	10.1.228.217 – 10.1.228.222	10.1.228.223
29	10.1.228.224/29	10.1.228.225 – 10.1.228.230	10.1.228.231
30	10.1.228.232/29	10.1.228.233 – 10.1.228.238	10.1.228.239
31	10.1.228.240/29	10.1.228.241 – 10.1.228.246	10.1.228.247
32	10.1.228.248/29	10.1.228.249 – 10.1.228.254	10.1.228.255
33	10.1.229.0/29	10.1.229.1 – 10.1.229.6	10.1.229.7
34	10.1.229.8/29	10.1.229.9 – 10.1.229.14	10.1.229.15
35	10.1.229.16/29	10.1.229.17 – 10.1.229.22	10.1.229.23
36	10.1.229.24/29	10.1.229.25 – 10.1.229.30	10.1.229.31
37	10.1.229.32/29	10.1.229.33 – 10.1.229.38	10.1.229.39
38	10.1.229.40/29	10.1.229.41 – 10.1.229.46	10.1.229.47
39	10.1.229.48/29	10.1.229.49 – 10.1.229.54	10.1.229.55
40	10.1.229.56/29	10.1.229.57 – 10.1.229.62	10.1.229.63
41	10.1.229.64/29	10.1.229.65 – 10.1.229.70	10.1.229.71
42	10.1.229.72/29	10.1.229.73 – 10.1.229.78	10.1.229.79
43	10.1.229.80/29	10.1.229.81 – 10.1.229.86	10.1.229.87
44	10.1.229.88/29	10.1.229.89 – 10.1.229.94	10.1.229.95
45	10.1.229.96/29	10.1.229.97 – 10.1.229.102	10.1.229.103
46	10.1.229.104/29	10.1.229.105 – 10.1.229.110	10.1.229.111
47	10.1.229.112/29	10.1.229.113 – 10.1.229.118	10.1.229.119
48	10.1.229.120/29	10.1.229.121 – 10.1.229.126	10.1.229.127
49	10.1.229.128/29	10.1.229.129 – 10.1.229.134	10.1.229.135
50	10.1.229.136/29	10.1.229.137 – 10.1.229.142	10.1.229.143
51	10.1.229.144/29	10.1.229.145 – 10.1.229.150	10.1.229.151
52	10.1.229.152/29	10.1.229.153 – 10.1.229.158	10.1.229.159
53	10.1.229.160/29	10.1.229.161 – 10.1.229.166	10.1.229.167
54	10.1.229.168/29	10.1.229.169 – 10.1.229.174	10.1.229.175
55	10.1.229.176/29	10.1.229.177 – 10.1.229.182	10.1.229.183
56	10.1.229.184/29	10.1.229.185 – 10.1.229.190	10.1.229.191
57	10.1.229.192/29	10.1.229.193 – 10.1.229.198	10.1.229.199
58	10.1.229.200/29	10.1.229.201 – 10.1.229.206	10.1.229.207
59	10.1.229.208/29	10.1.229.209 – 10.1.229.214	10.1.229.215
60	10.1.229.216/29	10.1.229.217 – 10.1.229.222	10.1.229.223
61	10.1.229.224/29	10.1.229.225 – 10.1.229.230	10.1.229.231
62	10.1.229.232/29	10.1.229.233 – 10.1.229.238	10.1.229.239
63	10.1.229.240/29	10.1.229.241 – 10.1.229.246	10.1.229.247
64	10.1.229.248/29	10.1.229.249 – 10.1.229.254	10.1.229.255

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 →