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)10.28.76.0/23

network10.28.76.0/23

broadcast10.28.77.255

first host10.28.76.1

last host10.28.77.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.28.76.0/23

address00001010.00011100.01001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00011100.01001100.00000000

broadcast00001010.00011100.01001101.11111111

green = network part, grey = host part

hex0x0a1c4c00

decimal169626624

reverse dns0.76.28.10.in-addr.arpa

ipv4-mapped::ffff:a1c:4c00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.28.76.0/29	10.28.76.1 – 10.28.76.6	10.28.76.7
2	10.28.76.8/29	10.28.76.9 – 10.28.76.14	10.28.76.15
3	10.28.76.16/29	10.28.76.17 – 10.28.76.22	10.28.76.23
4	10.28.76.24/29	10.28.76.25 – 10.28.76.30	10.28.76.31
5	10.28.76.32/29	10.28.76.33 – 10.28.76.38	10.28.76.39
6	10.28.76.40/29	10.28.76.41 – 10.28.76.46	10.28.76.47
7	10.28.76.48/29	10.28.76.49 – 10.28.76.54	10.28.76.55
8	10.28.76.56/29	10.28.76.57 – 10.28.76.62	10.28.76.63
9	10.28.76.64/29	10.28.76.65 – 10.28.76.70	10.28.76.71
10	10.28.76.72/29	10.28.76.73 – 10.28.76.78	10.28.76.79
11	10.28.76.80/29	10.28.76.81 – 10.28.76.86	10.28.76.87
12	10.28.76.88/29	10.28.76.89 – 10.28.76.94	10.28.76.95
13	10.28.76.96/29	10.28.76.97 – 10.28.76.102	10.28.76.103
14	10.28.76.104/29	10.28.76.105 – 10.28.76.110	10.28.76.111
15	10.28.76.112/29	10.28.76.113 – 10.28.76.118	10.28.76.119
16	10.28.76.120/29	10.28.76.121 – 10.28.76.126	10.28.76.127
17	10.28.76.128/29	10.28.76.129 – 10.28.76.134	10.28.76.135
18	10.28.76.136/29	10.28.76.137 – 10.28.76.142	10.28.76.143
19	10.28.76.144/29	10.28.76.145 – 10.28.76.150	10.28.76.151
20	10.28.76.152/29	10.28.76.153 – 10.28.76.158	10.28.76.159
21	10.28.76.160/29	10.28.76.161 – 10.28.76.166	10.28.76.167
22	10.28.76.168/29	10.28.76.169 – 10.28.76.174	10.28.76.175
23	10.28.76.176/29	10.28.76.177 – 10.28.76.182	10.28.76.183
24	10.28.76.184/29	10.28.76.185 – 10.28.76.190	10.28.76.191
25	10.28.76.192/29	10.28.76.193 – 10.28.76.198	10.28.76.199
26	10.28.76.200/29	10.28.76.201 – 10.28.76.206	10.28.76.207
27	10.28.76.208/29	10.28.76.209 – 10.28.76.214	10.28.76.215
28	10.28.76.216/29	10.28.76.217 – 10.28.76.222	10.28.76.223
29	10.28.76.224/29	10.28.76.225 – 10.28.76.230	10.28.76.231
30	10.28.76.232/29	10.28.76.233 – 10.28.76.238	10.28.76.239
31	10.28.76.240/29	10.28.76.241 – 10.28.76.246	10.28.76.247
32	10.28.76.248/29	10.28.76.249 – 10.28.76.254	10.28.76.255
33	10.28.77.0/29	10.28.77.1 – 10.28.77.6	10.28.77.7
34	10.28.77.8/29	10.28.77.9 – 10.28.77.14	10.28.77.15
35	10.28.77.16/29	10.28.77.17 – 10.28.77.22	10.28.77.23
36	10.28.77.24/29	10.28.77.25 – 10.28.77.30	10.28.77.31
37	10.28.77.32/29	10.28.77.33 – 10.28.77.38	10.28.77.39
38	10.28.77.40/29	10.28.77.41 – 10.28.77.46	10.28.77.47
39	10.28.77.48/29	10.28.77.49 – 10.28.77.54	10.28.77.55
40	10.28.77.56/29	10.28.77.57 – 10.28.77.62	10.28.77.63
41	10.28.77.64/29	10.28.77.65 – 10.28.77.70	10.28.77.71
42	10.28.77.72/29	10.28.77.73 – 10.28.77.78	10.28.77.79
43	10.28.77.80/29	10.28.77.81 – 10.28.77.86	10.28.77.87
44	10.28.77.88/29	10.28.77.89 – 10.28.77.94	10.28.77.95
45	10.28.77.96/29	10.28.77.97 – 10.28.77.102	10.28.77.103
46	10.28.77.104/29	10.28.77.105 – 10.28.77.110	10.28.77.111
47	10.28.77.112/29	10.28.77.113 – 10.28.77.118	10.28.77.119
48	10.28.77.120/29	10.28.77.121 – 10.28.77.126	10.28.77.127
49	10.28.77.128/29	10.28.77.129 – 10.28.77.134	10.28.77.135
50	10.28.77.136/29	10.28.77.137 – 10.28.77.142	10.28.77.143
51	10.28.77.144/29	10.28.77.145 – 10.28.77.150	10.28.77.151
52	10.28.77.152/29	10.28.77.153 – 10.28.77.158	10.28.77.159
53	10.28.77.160/29	10.28.77.161 – 10.28.77.166	10.28.77.167
54	10.28.77.168/29	10.28.77.169 – 10.28.77.174	10.28.77.175
55	10.28.77.176/29	10.28.77.177 – 10.28.77.182	10.28.77.183
56	10.28.77.184/29	10.28.77.185 – 10.28.77.190	10.28.77.191
57	10.28.77.192/29	10.28.77.193 – 10.28.77.198	10.28.77.199
58	10.28.77.200/29	10.28.77.201 – 10.28.77.206	10.28.77.207
59	10.28.77.208/29	10.28.77.209 – 10.28.77.214	10.28.77.215
60	10.28.77.216/29	10.28.77.217 – 10.28.77.222	10.28.77.223
61	10.28.77.224/29	10.28.77.225 – 10.28.77.230	10.28.77.231
62	10.28.77.232/29	10.28.77.233 – 10.28.77.238	10.28.77.239
63	10.28.77.240/29	10.28.77.241 – 10.28.77.246	10.28.77.247
64	10.28.77.248/29	10.28.77.249 – 10.28.77.254	10.28.77.255

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 →