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)10.71.182.0/23

network10.71.182.0/23

broadcast10.71.183.255

first host10.71.182.1

last host10.71.183.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.71.182.0/23

address00001010.01000111.10110110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000111.10110110.00000000

broadcast00001010.01000111.10110111.11111111

green = network part, grey = host part

hex0x0a47b600

decimal172471808

reverse dns0.182.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:b600

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.71.182.0/29	10.71.182.1 – 10.71.182.6	10.71.182.7
2	10.71.182.8/29	10.71.182.9 – 10.71.182.14	10.71.182.15
3	10.71.182.16/29	10.71.182.17 – 10.71.182.22	10.71.182.23
4	10.71.182.24/29	10.71.182.25 – 10.71.182.30	10.71.182.31
5	10.71.182.32/29	10.71.182.33 – 10.71.182.38	10.71.182.39
6	10.71.182.40/29	10.71.182.41 – 10.71.182.46	10.71.182.47
7	10.71.182.48/29	10.71.182.49 – 10.71.182.54	10.71.182.55
8	10.71.182.56/29	10.71.182.57 – 10.71.182.62	10.71.182.63
9	10.71.182.64/29	10.71.182.65 – 10.71.182.70	10.71.182.71
10	10.71.182.72/29	10.71.182.73 – 10.71.182.78	10.71.182.79
11	10.71.182.80/29	10.71.182.81 – 10.71.182.86	10.71.182.87
12	10.71.182.88/29	10.71.182.89 – 10.71.182.94	10.71.182.95
13	10.71.182.96/29	10.71.182.97 – 10.71.182.102	10.71.182.103
14	10.71.182.104/29	10.71.182.105 – 10.71.182.110	10.71.182.111
15	10.71.182.112/29	10.71.182.113 – 10.71.182.118	10.71.182.119
16	10.71.182.120/29	10.71.182.121 – 10.71.182.126	10.71.182.127
17	10.71.182.128/29	10.71.182.129 – 10.71.182.134	10.71.182.135
18	10.71.182.136/29	10.71.182.137 – 10.71.182.142	10.71.182.143
19	10.71.182.144/29	10.71.182.145 – 10.71.182.150	10.71.182.151
20	10.71.182.152/29	10.71.182.153 – 10.71.182.158	10.71.182.159
21	10.71.182.160/29	10.71.182.161 – 10.71.182.166	10.71.182.167
22	10.71.182.168/29	10.71.182.169 – 10.71.182.174	10.71.182.175
23	10.71.182.176/29	10.71.182.177 – 10.71.182.182	10.71.182.183
24	10.71.182.184/29	10.71.182.185 – 10.71.182.190	10.71.182.191
25	10.71.182.192/29	10.71.182.193 – 10.71.182.198	10.71.182.199
26	10.71.182.200/29	10.71.182.201 – 10.71.182.206	10.71.182.207
27	10.71.182.208/29	10.71.182.209 – 10.71.182.214	10.71.182.215
28	10.71.182.216/29	10.71.182.217 – 10.71.182.222	10.71.182.223
29	10.71.182.224/29	10.71.182.225 – 10.71.182.230	10.71.182.231
30	10.71.182.232/29	10.71.182.233 – 10.71.182.238	10.71.182.239
31	10.71.182.240/29	10.71.182.241 – 10.71.182.246	10.71.182.247
32	10.71.182.248/29	10.71.182.249 – 10.71.182.254	10.71.182.255
33	10.71.183.0/29	10.71.183.1 – 10.71.183.6	10.71.183.7
34	10.71.183.8/29	10.71.183.9 – 10.71.183.14	10.71.183.15
35	10.71.183.16/29	10.71.183.17 – 10.71.183.22	10.71.183.23
36	10.71.183.24/29	10.71.183.25 – 10.71.183.30	10.71.183.31
37	10.71.183.32/29	10.71.183.33 – 10.71.183.38	10.71.183.39
38	10.71.183.40/29	10.71.183.41 – 10.71.183.46	10.71.183.47
39	10.71.183.48/29	10.71.183.49 – 10.71.183.54	10.71.183.55
40	10.71.183.56/29	10.71.183.57 – 10.71.183.62	10.71.183.63
41	10.71.183.64/29	10.71.183.65 – 10.71.183.70	10.71.183.71
42	10.71.183.72/29	10.71.183.73 – 10.71.183.78	10.71.183.79
43	10.71.183.80/29	10.71.183.81 – 10.71.183.86	10.71.183.87
44	10.71.183.88/29	10.71.183.89 – 10.71.183.94	10.71.183.95
45	10.71.183.96/29	10.71.183.97 – 10.71.183.102	10.71.183.103
46	10.71.183.104/29	10.71.183.105 – 10.71.183.110	10.71.183.111
47	10.71.183.112/29	10.71.183.113 – 10.71.183.118	10.71.183.119
48	10.71.183.120/29	10.71.183.121 – 10.71.183.126	10.71.183.127
49	10.71.183.128/29	10.71.183.129 – 10.71.183.134	10.71.183.135
50	10.71.183.136/29	10.71.183.137 – 10.71.183.142	10.71.183.143
51	10.71.183.144/29	10.71.183.145 – 10.71.183.150	10.71.183.151
52	10.71.183.152/29	10.71.183.153 – 10.71.183.158	10.71.183.159
53	10.71.183.160/29	10.71.183.161 – 10.71.183.166	10.71.183.167
54	10.71.183.168/29	10.71.183.169 – 10.71.183.174	10.71.183.175
55	10.71.183.176/29	10.71.183.177 – 10.71.183.182	10.71.183.183
56	10.71.183.184/29	10.71.183.185 – 10.71.183.190	10.71.183.191
57	10.71.183.192/29	10.71.183.193 – 10.71.183.198	10.71.183.199
58	10.71.183.200/29	10.71.183.201 – 10.71.183.206	10.71.183.207
59	10.71.183.208/29	10.71.183.209 – 10.71.183.214	10.71.183.215
60	10.71.183.216/29	10.71.183.217 – 10.71.183.222	10.71.183.223
61	10.71.183.224/29	10.71.183.225 – 10.71.183.230	10.71.183.231
62	10.71.183.232/29	10.71.183.233 – 10.71.183.238	10.71.183.239
63	10.71.183.240/29	10.71.183.241 – 10.71.183.246	10.71.183.247
64	10.71.183.248/29	10.71.183.249 – 10.71.183.254	10.71.183.255

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 →