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)10.1.160.0/23

network10.1.160.0/23

broadcast10.1.161.255

first host10.1.160.1

last host10.1.161.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.160.0/23

address00001010.00000001.10100000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.10100000.00000000

broadcast00001010.00000001.10100001.11111111

green = network part, grey = host part

hex0x0a01a000

decimal167878656

reverse dns0.160.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:a000

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.160.0/29	10.1.160.1 – 10.1.160.6	10.1.160.7
2	10.1.160.8/29	10.1.160.9 – 10.1.160.14	10.1.160.15
3	10.1.160.16/29	10.1.160.17 – 10.1.160.22	10.1.160.23
4	10.1.160.24/29	10.1.160.25 – 10.1.160.30	10.1.160.31
5	10.1.160.32/29	10.1.160.33 – 10.1.160.38	10.1.160.39
6	10.1.160.40/29	10.1.160.41 – 10.1.160.46	10.1.160.47
7	10.1.160.48/29	10.1.160.49 – 10.1.160.54	10.1.160.55
8	10.1.160.56/29	10.1.160.57 – 10.1.160.62	10.1.160.63
9	10.1.160.64/29	10.1.160.65 – 10.1.160.70	10.1.160.71
10	10.1.160.72/29	10.1.160.73 – 10.1.160.78	10.1.160.79
11	10.1.160.80/29	10.1.160.81 – 10.1.160.86	10.1.160.87
12	10.1.160.88/29	10.1.160.89 – 10.1.160.94	10.1.160.95
13	10.1.160.96/29	10.1.160.97 – 10.1.160.102	10.1.160.103
14	10.1.160.104/29	10.1.160.105 – 10.1.160.110	10.1.160.111
15	10.1.160.112/29	10.1.160.113 – 10.1.160.118	10.1.160.119
16	10.1.160.120/29	10.1.160.121 – 10.1.160.126	10.1.160.127
17	10.1.160.128/29	10.1.160.129 – 10.1.160.134	10.1.160.135
18	10.1.160.136/29	10.1.160.137 – 10.1.160.142	10.1.160.143
19	10.1.160.144/29	10.1.160.145 – 10.1.160.150	10.1.160.151
20	10.1.160.152/29	10.1.160.153 – 10.1.160.158	10.1.160.159
21	10.1.160.160/29	10.1.160.161 – 10.1.160.166	10.1.160.167
22	10.1.160.168/29	10.1.160.169 – 10.1.160.174	10.1.160.175
23	10.1.160.176/29	10.1.160.177 – 10.1.160.182	10.1.160.183
24	10.1.160.184/29	10.1.160.185 – 10.1.160.190	10.1.160.191
25	10.1.160.192/29	10.1.160.193 – 10.1.160.198	10.1.160.199
26	10.1.160.200/29	10.1.160.201 – 10.1.160.206	10.1.160.207
27	10.1.160.208/29	10.1.160.209 – 10.1.160.214	10.1.160.215
28	10.1.160.216/29	10.1.160.217 – 10.1.160.222	10.1.160.223
29	10.1.160.224/29	10.1.160.225 – 10.1.160.230	10.1.160.231
30	10.1.160.232/29	10.1.160.233 – 10.1.160.238	10.1.160.239
31	10.1.160.240/29	10.1.160.241 – 10.1.160.246	10.1.160.247
32	10.1.160.248/29	10.1.160.249 – 10.1.160.254	10.1.160.255
33	10.1.161.0/29	10.1.161.1 – 10.1.161.6	10.1.161.7
34	10.1.161.8/29	10.1.161.9 – 10.1.161.14	10.1.161.15
35	10.1.161.16/29	10.1.161.17 – 10.1.161.22	10.1.161.23
36	10.1.161.24/29	10.1.161.25 – 10.1.161.30	10.1.161.31
37	10.1.161.32/29	10.1.161.33 – 10.1.161.38	10.1.161.39
38	10.1.161.40/29	10.1.161.41 – 10.1.161.46	10.1.161.47
39	10.1.161.48/29	10.1.161.49 – 10.1.161.54	10.1.161.55
40	10.1.161.56/29	10.1.161.57 – 10.1.161.62	10.1.161.63
41	10.1.161.64/29	10.1.161.65 – 10.1.161.70	10.1.161.71
42	10.1.161.72/29	10.1.161.73 – 10.1.161.78	10.1.161.79
43	10.1.161.80/29	10.1.161.81 – 10.1.161.86	10.1.161.87
44	10.1.161.88/29	10.1.161.89 – 10.1.161.94	10.1.161.95
45	10.1.161.96/29	10.1.161.97 – 10.1.161.102	10.1.161.103
46	10.1.161.104/29	10.1.161.105 – 10.1.161.110	10.1.161.111
47	10.1.161.112/29	10.1.161.113 – 10.1.161.118	10.1.161.119
48	10.1.161.120/29	10.1.161.121 – 10.1.161.126	10.1.161.127
49	10.1.161.128/29	10.1.161.129 – 10.1.161.134	10.1.161.135
50	10.1.161.136/29	10.1.161.137 – 10.1.161.142	10.1.161.143
51	10.1.161.144/29	10.1.161.145 – 10.1.161.150	10.1.161.151
52	10.1.161.152/29	10.1.161.153 – 10.1.161.158	10.1.161.159
53	10.1.161.160/29	10.1.161.161 – 10.1.161.166	10.1.161.167
54	10.1.161.168/29	10.1.161.169 – 10.1.161.174	10.1.161.175
55	10.1.161.176/29	10.1.161.177 – 10.1.161.182	10.1.161.183
56	10.1.161.184/29	10.1.161.185 – 10.1.161.190	10.1.161.191
57	10.1.161.192/29	10.1.161.193 – 10.1.161.198	10.1.161.199
58	10.1.161.200/29	10.1.161.201 – 10.1.161.206	10.1.161.207
59	10.1.161.208/29	10.1.161.209 – 10.1.161.214	10.1.161.215
60	10.1.161.216/29	10.1.161.217 – 10.1.161.222	10.1.161.223
61	10.1.161.224/29	10.1.161.225 – 10.1.161.230	10.1.161.231
62	10.1.161.232/29	10.1.161.233 – 10.1.161.238	10.1.161.239
63	10.1.161.240/29	10.1.161.241 – 10.1.161.246	10.1.161.247
64	10.1.161.248/29	10.1.161.249 – 10.1.161.254	10.1.161.255

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 →