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)10.71.176.0/23

network10.71.176.0/23

broadcast10.71.177.255

first host10.71.176.1

last host10.71.177.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.71.176.0/23

address00001010.01000111.10110000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000111.10110000.00000000

broadcast00001010.01000111.10110001.11111111

green = network part, grey = host part

hex0x0a47b000

decimal172470272

reverse dns0.176.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:b000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.71.176.0/29	10.71.176.1 – 10.71.176.6	10.71.176.7
2	10.71.176.8/29	10.71.176.9 – 10.71.176.14	10.71.176.15
3	10.71.176.16/29	10.71.176.17 – 10.71.176.22	10.71.176.23
4	10.71.176.24/29	10.71.176.25 – 10.71.176.30	10.71.176.31
5	10.71.176.32/29	10.71.176.33 – 10.71.176.38	10.71.176.39
6	10.71.176.40/29	10.71.176.41 – 10.71.176.46	10.71.176.47
7	10.71.176.48/29	10.71.176.49 – 10.71.176.54	10.71.176.55
8	10.71.176.56/29	10.71.176.57 – 10.71.176.62	10.71.176.63
9	10.71.176.64/29	10.71.176.65 – 10.71.176.70	10.71.176.71
10	10.71.176.72/29	10.71.176.73 – 10.71.176.78	10.71.176.79
11	10.71.176.80/29	10.71.176.81 – 10.71.176.86	10.71.176.87
12	10.71.176.88/29	10.71.176.89 – 10.71.176.94	10.71.176.95
13	10.71.176.96/29	10.71.176.97 – 10.71.176.102	10.71.176.103
14	10.71.176.104/29	10.71.176.105 – 10.71.176.110	10.71.176.111
15	10.71.176.112/29	10.71.176.113 – 10.71.176.118	10.71.176.119
16	10.71.176.120/29	10.71.176.121 – 10.71.176.126	10.71.176.127
17	10.71.176.128/29	10.71.176.129 – 10.71.176.134	10.71.176.135
18	10.71.176.136/29	10.71.176.137 – 10.71.176.142	10.71.176.143
19	10.71.176.144/29	10.71.176.145 – 10.71.176.150	10.71.176.151
20	10.71.176.152/29	10.71.176.153 – 10.71.176.158	10.71.176.159
21	10.71.176.160/29	10.71.176.161 – 10.71.176.166	10.71.176.167
22	10.71.176.168/29	10.71.176.169 – 10.71.176.174	10.71.176.175
23	10.71.176.176/29	10.71.176.177 – 10.71.176.182	10.71.176.183
24	10.71.176.184/29	10.71.176.185 – 10.71.176.190	10.71.176.191
25	10.71.176.192/29	10.71.176.193 – 10.71.176.198	10.71.176.199
26	10.71.176.200/29	10.71.176.201 – 10.71.176.206	10.71.176.207
27	10.71.176.208/29	10.71.176.209 – 10.71.176.214	10.71.176.215
28	10.71.176.216/29	10.71.176.217 – 10.71.176.222	10.71.176.223
29	10.71.176.224/29	10.71.176.225 – 10.71.176.230	10.71.176.231
30	10.71.176.232/29	10.71.176.233 – 10.71.176.238	10.71.176.239
31	10.71.176.240/29	10.71.176.241 – 10.71.176.246	10.71.176.247
32	10.71.176.248/29	10.71.176.249 – 10.71.176.254	10.71.176.255
33	10.71.177.0/29	10.71.177.1 – 10.71.177.6	10.71.177.7
34	10.71.177.8/29	10.71.177.9 – 10.71.177.14	10.71.177.15
35	10.71.177.16/29	10.71.177.17 – 10.71.177.22	10.71.177.23
36	10.71.177.24/29	10.71.177.25 – 10.71.177.30	10.71.177.31
37	10.71.177.32/29	10.71.177.33 – 10.71.177.38	10.71.177.39
38	10.71.177.40/29	10.71.177.41 – 10.71.177.46	10.71.177.47
39	10.71.177.48/29	10.71.177.49 – 10.71.177.54	10.71.177.55
40	10.71.177.56/29	10.71.177.57 – 10.71.177.62	10.71.177.63
41	10.71.177.64/29	10.71.177.65 – 10.71.177.70	10.71.177.71
42	10.71.177.72/29	10.71.177.73 – 10.71.177.78	10.71.177.79
43	10.71.177.80/29	10.71.177.81 – 10.71.177.86	10.71.177.87
44	10.71.177.88/29	10.71.177.89 – 10.71.177.94	10.71.177.95
45	10.71.177.96/29	10.71.177.97 – 10.71.177.102	10.71.177.103
46	10.71.177.104/29	10.71.177.105 – 10.71.177.110	10.71.177.111
47	10.71.177.112/29	10.71.177.113 – 10.71.177.118	10.71.177.119
48	10.71.177.120/29	10.71.177.121 – 10.71.177.126	10.71.177.127
49	10.71.177.128/29	10.71.177.129 – 10.71.177.134	10.71.177.135
50	10.71.177.136/29	10.71.177.137 – 10.71.177.142	10.71.177.143
51	10.71.177.144/29	10.71.177.145 – 10.71.177.150	10.71.177.151
52	10.71.177.152/29	10.71.177.153 – 10.71.177.158	10.71.177.159
53	10.71.177.160/29	10.71.177.161 – 10.71.177.166	10.71.177.167
54	10.71.177.168/29	10.71.177.169 – 10.71.177.174	10.71.177.175
55	10.71.177.176/29	10.71.177.177 – 10.71.177.182	10.71.177.183
56	10.71.177.184/29	10.71.177.185 – 10.71.177.190	10.71.177.191
57	10.71.177.192/29	10.71.177.193 – 10.71.177.198	10.71.177.199
58	10.71.177.200/29	10.71.177.201 – 10.71.177.206	10.71.177.207
59	10.71.177.208/29	10.71.177.209 – 10.71.177.214	10.71.177.215
60	10.71.177.216/29	10.71.177.217 – 10.71.177.222	10.71.177.223
61	10.71.177.224/29	10.71.177.225 – 10.71.177.230	10.71.177.231
62	10.71.177.232/29	10.71.177.233 – 10.71.177.238	10.71.177.239
63	10.71.177.240/29	10.71.177.241 – 10.71.177.246	10.71.177.247
64	10.71.177.248/29	10.71.177.249 – 10.71.177.254	10.71.177.255

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 →