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)10.18.160.0/19

network10.18.160.0/19

broadcast10.18.191.255

first host10.18.160.1

last host10.18.191.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.18.160.0/19

address00001010.00010010.10100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010010.10100000.00000000

broadcast00001010.00010010.10111111.11111111

green = network part, grey = host part

hex0x0a12a000

decimal168992768

reverse dns0.160.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:a000

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.18.160.0/26	10.18.160.1 – 10.18.160.62	10.18.160.63
2	10.18.160.64/26	10.18.160.65 – 10.18.160.126	10.18.160.127
3	10.18.160.128/26	10.18.160.129 – 10.18.160.190	10.18.160.191
4	10.18.160.192/26	10.18.160.193 – 10.18.160.254	10.18.160.255
5	10.18.161.0/26	10.18.161.1 – 10.18.161.62	10.18.161.63
6	10.18.161.64/26	10.18.161.65 – 10.18.161.126	10.18.161.127
7	10.18.161.128/26	10.18.161.129 – 10.18.161.190	10.18.161.191
8	10.18.161.192/26	10.18.161.193 – 10.18.161.254	10.18.161.255
9	10.18.162.0/26	10.18.162.1 – 10.18.162.62	10.18.162.63
10	10.18.162.64/26	10.18.162.65 – 10.18.162.126	10.18.162.127
11	10.18.162.128/26	10.18.162.129 – 10.18.162.190	10.18.162.191
12	10.18.162.192/26	10.18.162.193 – 10.18.162.254	10.18.162.255
13	10.18.163.0/26	10.18.163.1 – 10.18.163.62	10.18.163.63
14	10.18.163.64/26	10.18.163.65 – 10.18.163.126	10.18.163.127
15	10.18.163.128/26	10.18.163.129 – 10.18.163.190	10.18.163.191
16	10.18.163.192/26	10.18.163.193 – 10.18.163.254	10.18.163.255
17	10.18.164.0/26	10.18.164.1 – 10.18.164.62	10.18.164.63
18	10.18.164.64/26	10.18.164.65 – 10.18.164.126	10.18.164.127
19	10.18.164.128/26	10.18.164.129 – 10.18.164.190	10.18.164.191
20	10.18.164.192/26	10.18.164.193 – 10.18.164.254	10.18.164.255
21	10.18.165.0/26	10.18.165.1 – 10.18.165.62	10.18.165.63
22	10.18.165.64/26	10.18.165.65 – 10.18.165.126	10.18.165.127
23	10.18.165.128/26	10.18.165.129 – 10.18.165.190	10.18.165.191
24	10.18.165.192/26	10.18.165.193 – 10.18.165.254	10.18.165.255
25	10.18.166.0/26	10.18.166.1 – 10.18.166.62	10.18.166.63
26	10.18.166.64/26	10.18.166.65 – 10.18.166.126	10.18.166.127
27	10.18.166.128/26	10.18.166.129 – 10.18.166.190	10.18.166.191
28	10.18.166.192/26	10.18.166.193 – 10.18.166.254	10.18.166.255
29	10.18.167.0/26	10.18.167.1 – 10.18.167.62	10.18.167.63
30	10.18.167.64/26	10.18.167.65 – 10.18.167.126	10.18.167.127
31	10.18.167.128/26	10.18.167.129 – 10.18.167.190	10.18.167.191
32	10.18.167.192/26	10.18.167.193 – 10.18.167.254	10.18.167.255
33	10.18.168.0/26	10.18.168.1 – 10.18.168.62	10.18.168.63
34	10.18.168.64/26	10.18.168.65 – 10.18.168.126	10.18.168.127
35	10.18.168.128/26	10.18.168.129 – 10.18.168.190	10.18.168.191
36	10.18.168.192/26	10.18.168.193 – 10.18.168.254	10.18.168.255
37	10.18.169.0/26	10.18.169.1 – 10.18.169.62	10.18.169.63
38	10.18.169.64/26	10.18.169.65 – 10.18.169.126	10.18.169.127
39	10.18.169.128/26	10.18.169.129 – 10.18.169.190	10.18.169.191
40	10.18.169.192/26	10.18.169.193 – 10.18.169.254	10.18.169.255
41	10.18.170.0/26	10.18.170.1 – 10.18.170.62	10.18.170.63
42	10.18.170.64/26	10.18.170.65 – 10.18.170.126	10.18.170.127
43	10.18.170.128/26	10.18.170.129 – 10.18.170.190	10.18.170.191
44	10.18.170.192/26	10.18.170.193 – 10.18.170.254	10.18.170.255
45	10.18.171.0/26	10.18.171.1 – 10.18.171.62	10.18.171.63
46	10.18.171.64/26	10.18.171.65 – 10.18.171.126	10.18.171.127
47	10.18.171.128/26	10.18.171.129 – 10.18.171.190	10.18.171.191
48	10.18.171.192/26	10.18.171.193 – 10.18.171.254	10.18.171.255
49	10.18.172.0/26	10.18.172.1 – 10.18.172.62	10.18.172.63
50	10.18.172.64/26	10.18.172.65 – 10.18.172.126	10.18.172.127
51	10.18.172.128/26	10.18.172.129 – 10.18.172.190	10.18.172.191
52	10.18.172.192/26	10.18.172.193 – 10.18.172.254	10.18.172.255
53	10.18.173.0/26	10.18.173.1 – 10.18.173.62	10.18.173.63
54	10.18.173.64/26	10.18.173.65 – 10.18.173.126	10.18.173.127
55	10.18.173.128/26	10.18.173.129 – 10.18.173.190	10.18.173.191
56	10.18.173.192/26	10.18.173.193 – 10.18.173.254	10.18.173.255
57	10.18.174.0/26	10.18.174.1 – 10.18.174.62	10.18.174.63
58	10.18.174.64/26	10.18.174.65 – 10.18.174.126	10.18.174.127
59	10.18.174.128/26	10.18.174.129 – 10.18.174.190	10.18.174.191
60	10.18.174.192/26	10.18.174.193 – 10.18.174.254	10.18.174.255
61	10.18.175.0/26	10.18.175.1 – 10.18.175.62	10.18.175.63
62	10.18.175.64/26	10.18.175.65 – 10.18.175.126	10.18.175.127
63	10.18.175.128/26	10.18.175.129 – 10.18.175.190	10.18.175.191
64	10.18.175.192/26	10.18.175.193 – 10.18.175.254	10.18.175.255
65	10.18.176.0/26	10.18.176.1 – 10.18.176.62	10.18.176.63
66	10.18.176.64/26	10.18.176.65 – 10.18.176.126	10.18.176.127
67	10.18.176.128/26	10.18.176.129 – 10.18.176.190	10.18.176.191
68	10.18.176.192/26	10.18.176.193 – 10.18.176.254	10.18.176.255
69	10.18.177.0/26	10.18.177.1 – 10.18.177.62	10.18.177.63
70	10.18.177.64/26	10.18.177.65 – 10.18.177.126	10.18.177.127
71	10.18.177.128/26	10.18.177.129 – 10.18.177.190	10.18.177.191
72	10.18.177.192/26	10.18.177.193 – 10.18.177.254	10.18.177.255
73	10.18.178.0/26	10.18.178.1 – 10.18.178.62	10.18.178.63
74	10.18.178.64/26	10.18.178.65 – 10.18.178.126	10.18.178.127
75	10.18.178.128/26	10.18.178.129 – 10.18.178.190	10.18.178.191
76	10.18.178.192/26	10.18.178.193 – 10.18.178.254	10.18.178.255
77	10.18.179.0/26	10.18.179.1 – 10.18.179.62	10.18.179.63
78	10.18.179.64/26	10.18.179.65 – 10.18.179.126	10.18.179.127
79	10.18.179.128/26	10.18.179.129 – 10.18.179.190	10.18.179.191
80	10.18.179.192/26	10.18.179.193 – 10.18.179.254	10.18.179.255
81	10.18.180.0/26	10.18.180.1 – 10.18.180.62	10.18.180.63
82	10.18.180.64/26	10.18.180.65 – 10.18.180.126	10.18.180.127
83	10.18.180.128/26	10.18.180.129 – 10.18.180.190	10.18.180.191
84	10.18.180.192/26	10.18.180.193 – 10.18.180.254	10.18.180.255
85	10.18.181.0/26	10.18.181.1 – 10.18.181.62	10.18.181.63
86	10.18.181.64/26	10.18.181.65 – 10.18.181.126	10.18.181.127
87	10.18.181.128/26	10.18.181.129 – 10.18.181.190	10.18.181.191
88	10.18.181.192/26	10.18.181.193 – 10.18.181.254	10.18.181.255
89	10.18.182.0/26	10.18.182.1 – 10.18.182.62	10.18.182.63
90	10.18.182.64/26	10.18.182.65 – 10.18.182.126	10.18.182.127
91	10.18.182.128/26	10.18.182.129 – 10.18.182.190	10.18.182.191
92	10.18.182.192/26	10.18.182.193 – 10.18.182.254	10.18.182.255
93	10.18.183.0/26	10.18.183.1 – 10.18.183.62	10.18.183.63
94	10.18.183.64/26	10.18.183.65 – 10.18.183.126	10.18.183.127
95	10.18.183.128/26	10.18.183.129 – 10.18.183.190	10.18.183.191
96	10.18.183.192/26	10.18.183.193 – 10.18.183.254	10.18.183.255
97	10.18.184.0/26	10.18.184.1 – 10.18.184.62	10.18.184.63
98	10.18.184.64/26	10.18.184.65 – 10.18.184.126	10.18.184.127
99	10.18.184.128/26	10.18.184.129 – 10.18.184.190	10.18.184.191
100	10.18.184.192/26	10.18.184.193 – 10.18.184.254	10.18.184.255
101	10.18.185.0/26	10.18.185.1 – 10.18.185.62	10.18.185.63
102	10.18.185.64/26	10.18.185.65 – 10.18.185.126	10.18.185.127
103	10.18.185.128/26	10.18.185.129 – 10.18.185.190	10.18.185.191
104	10.18.185.192/26	10.18.185.193 – 10.18.185.254	10.18.185.255
105	10.18.186.0/26	10.18.186.1 – 10.18.186.62	10.18.186.63
106	10.18.186.64/26	10.18.186.65 – 10.18.186.126	10.18.186.127
107	10.18.186.128/26	10.18.186.129 – 10.18.186.190	10.18.186.191
108	10.18.186.192/26	10.18.186.193 – 10.18.186.254	10.18.186.255
109	10.18.187.0/26	10.18.187.1 – 10.18.187.62	10.18.187.63
110	10.18.187.64/26	10.18.187.65 – 10.18.187.126	10.18.187.127
111	10.18.187.128/26	10.18.187.129 – 10.18.187.190	10.18.187.191
112	10.18.187.192/26	10.18.187.193 – 10.18.187.254	10.18.187.255
113	10.18.188.0/26	10.18.188.1 – 10.18.188.62	10.18.188.63
114	10.18.188.64/26	10.18.188.65 – 10.18.188.126	10.18.188.127
115	10.18.188.128/26	10.18.188.129 – 10.18.188.190	10.18.188.191
116	10.18.188.192/26	10.18.188.193 – 10.18.188.254	10.18.188.255
117	10.18.189.0/26	10.18.189.1 – 10.18.189.62	10.18.189.63
118	10.18.189.64/26	10.18.189.65 – 10.18.189.126	10.18.189.127
119	10.18.189.128/26	10.18.189.129 – 10.18.189.190	10.18.189.191
120	10.18.189.192/26	10.18.189.193 – 10.18.189.254	10.18.189.255
121	10.18.190.0/26	10.18.190.1 – 10.18.190.62	10.18.190.63
122	10.18.190.64/26	10.18.190.65 – 10.18.190.126	10.18.190.127
123	10.18.190.128/26	10.18.190.129 – 10.18.190.190	10.18.190.191
124	10.18.190.192/26	10.18.190.193 – 10.18.190.254	10.18.190.255
125	10.18.191.0/26	10.18.191.1 – 10.18.191.62	10.18.191.63
126	10.18.191.64/26	10.18.191.65 – 10.18.191.126	10.18.191.127
127	10.18.191.128/26	10.18.191.129 – 10.18.191.190	10.18.191.191
128	10.18.191.192/26	10.18.191.193 – 10.18.191.254	10.18.191.255

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 /19
/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	1
/20	255.255.240.0	4,096	4,094	2 split →
/21	255.255.248.0	2,048	2,046	4 split →
/22	255.255.252.0	1,024	1,022	8 split →
/23	255.255.254.0	512	510	16 split →
/24	255.255.255.0	256	254	32 split →
/25	255.255.255.128	128	126	64 split →
/26	255.255.255.192	64	62	128 split →
/27	255.255.255.224	32	30	256 split →
/28	255.255.255.240	16	14	512 split →
/29	255.255.255.248	8	6	1,024 split →
/30	255.255.255.252	4	2	2,048 split →
/31	255.255.255.254	2	2	4,096 split →
/32	255.255.255.255	1	1	8,192 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 →