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)10.18.224.0/19

network10.18.224.0/19

broadcast10.18.255.255

first host10.18.224.1

last host10.18.255.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.18.224.0/19

address00001010.00010010.11100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010010.11100000.00000000

broadcast00001010.00010010.11111111.11111111

green = network part, grey = host part

hex0x0a12e000

decimal169009152

reverse dns0.224.18.10.in-addr.arpa

ipv4-mapped::ffff:a12:e000

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.18.224.0/26	10.18.224.1 – 10.18.224.62	10.18.224.63
2	10.18.224.64/26	10.18.224.65 – 10.18.224.126	10.18.224.127
3	10.18.224.128/26	10.18.224.129 – 10.18.224.190	10.18.224.191
4	10.18.224.192/26	10.18.224.193 – 10.18.224.254	10.18.224.255
5	10.18.225.0/26	10.18.225.1 – 10.18.225.62	10.18.225.63
6	10.18.225.64/26	10.18.225.65 – 10.18.225.126	10.18.225.127
7	10.18.225.128/26	10.18.225.129 – 10.18.225.190	10.18.225.191
8	10.18.225.192/26	10.18.225.193 – 10.18.225.254	10.18.225.255
9	10.18.226.0/26	10.18.226.1 – 10.18.226.62	10.18.226.63
10	10.18.226.64/26	10.18.226.65 – 10.18.226.126	10.18.226.127
11	10.18.226.128/26	10.18.226.129 – 10.18.226.190	10.18.226.191
12	10.18.226.192/26	10.18.226.193 – 10.18.226.254	10.18.226.255
13	10.18.227.0/26	10.18.227.1 – 10.18.227.62	10.18.227.63
14	10.18.227.64/26	10.18.227.65 – 10.18.227.126	10.18.227.127
15	10.18.227.128/26	10.18.227.129 – 10.18.227.190	10.18.227.191
16	10.18.227.192/26	10.18.227.193 – 10.18.227.254	10.18.227.255
17	10.18.228.0/26	10.18.228.1 – 10.18.228.62	10.18.228.63
18	10.18.228.64/26	10.18.228.65 – 10.18.228.126	10.18.228.127
19	10.18.228.128/26	10.18.228.129 – 10.18.228.190	10.18.228.191
20	10.18.228.192/26	10.18.228.193 – 10.18.228.254	10.18.228.255
21	10.18.229.0/26	10.18.229.1 – 10.18.229.62	10.18.229.63
22	10.18.229.64/26	10.18.229.65 – 10.18.229.126	10.18.229.127
23	10.18.229.128/26	10.18.229.129 – 10.18.229.190	10.18.229.191
24	10.18.229.192/26	10.18.229.193 – 10.18.229.254	10.18.229.255
25	10.18.230.0/26	10.18.230.1 – 10.18.230.62	10.18.230.63
26	10.18.230.64/26	10.18.230.65 – 10.18.230.126	10.18.230.127
27	10.18.230.128/26	10.18.230.129 – 10.18.230.190	10.18.230.191
28	10.18.230.192/26	10.18.230.193 – 10.18.230.254	10.18.230.255
29	10.18.231.0/26	10.18.231.1 – 10.18.231.62	10.18.231.63
30	10.18.231.64/26	10.18.231.65 – 10.18.231.126	10.18.231.127
31	10.18.231.128/26	10.18.231.129 – 10.18.231.190	10.18.231.191
32	10.18.231.192/26	10.18.231.193 – 10.18.231.254	10.18.231.255
33	10.18.232.0/26	10.18.232.1 – 10.18.232.62	10.18.232.63
34	10.18.232.64/26	10.18.232.65 – 10.18.232.126	10.18.232.127
35	10.18.232.128/26	10.18.232.129 – 10.18.232.190	10.18.232.191
36	10.18.232.192/26	10.18.232.193 – 10.18.232.254	10.18.232.255
37	10.18.233.0/26	10.18.233.1 – 10.18.233.62	10.18.233.63
38	10.18.233.64/26	10.18.233.65 – 10.18.233.126	10.18.233.127
39	10.18.233.128/26	10.18.233.129 – 10.18.233.190	10.18.233.191
40	10.18.233.192/26	10.18.233.193 – 10.18.233.254	10.18.233.255
41	10.18.234.0/26	10.18.234.1 – 10.18.234.62	10.18.234.63
42	10.18.234.64/26	10.18.234.65 – 10.18.234.126	10.18.234.127
43	10.18.234.128/26	10.18.234.129 – 10.18.234.190	10.18.234.191
44	10.18.234.192/26	10.18.234.193 – 10.18.234.254	10.18.234.255
45	10.18.235.0/26	10.18.235.1 – 10.18.235.62	10.18.235.63
46	10.18.235.64/26	10.18.235.65 – 10.18.235.126	10.18.235.127
47	10.18.235.128/26	10.18.235.129 – 10.18.235.190	10.18.235.191
48	10.18.235.192/26	10.18.235.193 – 10.18.235.254	10.18.235.255
49	10.18.236.0/26	10.18.236.1 – 10.18.236.62	10.18.236.63
50	10.18.236.64/26	10.18.236.65 – 10.18.236.126	10.18.236.127
51	10.18.236.128/26	10.18.236.129 – 10.18.236.190	10.18.236.191
52	10.18.236.192/26	10.18.236.193 – 10.18.236.254	10.18.236.255
53	10.18.237.0/26	10.18.237.1 – 10.18.237.62	10.18.237.63
54	10.18.237.64/26	10.18.237.65 – 10.18.237.126	10.18.237.127
55	10.18.237.128/26	10.18.237.129 – 10.18.237.190	10.18.237.191
56	10.18.237.192/26	10.18.237.193 – 10.18.237.254	10.18.237.255
57	10.18.238.0/26	10.18.238.1 – 10.18.238.62	10.18.238.63
58	10.18.238.64/26	10.18.238.65 – 10.18.238.126	10.18.238.127
59	10.18.238.128/26	10.18.238.129 – 10.18.238.190	10.18.238.191
60	10.18.238.192/26	10.18.238.193 – 10.18.238.254	10.18.238.255
61	10.18.239.0/26	10.18.239.1 – 10.18.239.62	10.18.239.63
62	10.18.239.64/26	10.18.239.65 – 10.18.239.126	10.18.239.127
63	10.18.239.128/26	10.18.239.129 – 10.18.239.190	10.18.239.191
64	10.18.239.192/26	10.18.239.193 – 10.18.239.254	10.18.239.255
65	10.18.240.0/26	10.18.240.1 – 10.18.240.62	10.18.240.63
66	10.18.240.64/26	10.18.240.65 – 10.18.240.126	10.18.240.127
67	10.18.240.128/26	10.18.240.129 – 10.18.240.190	10.18.240.191
68	10.18.240.192/26	10.18.240.193 – 10.18.240.254	10.18.240.255
69	10.18.241.0/26	10.18.241.1 – 10.18.241.62	10.18.241.63
70	10.18.241.64/26	10.18.241.65 – 10.18.241.126	10.18.241.127
71	10.18.241.128/26	10.18.241.129 – 10.18.241.190	10.18.241.191
72	10.18.241.192/26	10.18.241.193 – 10.18.241.254	10.18.241.255
73	10.18.242.0/26	10.18.242.1 – 10.18.242.62	10.18.242.63
74	10.18.242.64/26	10.18.242.65 – 10.18.242.126	10.18.242.127
75	10.18.242.128/26	10.18.242.129 – 10.18.242.190	10.18.242.191
76	10.18.242.192/26	10.18.242.193 – 10.18.242.254	10.18.242.255
77	10.18.243.0/26	10.18.243.1 – 10.18.243.62	10.18.243.63
78	10.18.243.64/26	10.18.243.65 – 10.18.243.126	10.18.243.127
79	10.18.243.128/26	10.18.243.129 – 10.18.243.190	10.18.243.191
80	10.18.243.192/26	10.18.243.193 – 10.18.243.254	10.18.243.255
81	10.18.244.0/26	10.18.244.1 – 10.18.244.62	10.18.244.63
82	10.18.244.64/26	10.18.244.65 – 10.18.244.126	10.18.244.127
83	10.18.244.128/26	10.18.244.129 – 10.18.244.190	10.18.244.191
84	10.18.244.192/26	10.18.244.193 – 10.18.244.254	10.18.244.255
85	10.18.245.0/26	10.18.245.1 – 10.18.245.62	10.18.245.63
86	10.18.245.64/26	10.18.245.65 – 10.18.245.126	10.18.245.127
87	10.18.245.128/26	10.18.245.129 – 10.18.245.190	10.18.245.191
88	10.18.245.192/26	10.18.245.193 – 10.18.245.254	10.18.245.255
89	10.18.246.0/26	10.18.246.1 – 10.18.246.62	10.18.246.63
90	10.18.246.64/26	10.18.246.65 – 10.18.246.126	10.18.246.127
91	10.18.246.128/26	10.18.246.129 – 10.18.246.190	10.18.246.191
92	10.18.246.192/26	10.18.246.193 – 10.18.246.254	10.18.246.255
93	10.18.247.0/26	10.18.247.1 – 10.18.247.62	10.18.247.63
94	10.18.247.64/26	10.18.247.65 – 10.18.247.126	10.18.247.127
95	10.18.247.128/26	10.18.247.129 – 10.18.247.190	10.18.247.191
96	10.18.247.192/26	10.18.247.193 – 10.18.247.254	10.18.247.255
97	10.18.248.0/26	10.18.248.1 – 10.18.248.62	10.18.248.63
98	10.18.248.64/26	10.18.248.65 – 10.18.248.126	10.18.248.127
99	10.18.248.128/26	10.18.248.129 – 10.18.248.190	10.18.248.191
100	10.18.248.192/26	10.18.248.193 – 10.18.248.254	10.18.248.255
101	10.18.249.0/26	10.18.249.1 – 10.18.249.62	10.18.249.63
102	10.18.249.64/26	10.18.249.65 – 10.18.249.126	10.18.249.127
103	10.18.249.128/26	10.18.249.129 – 10.18.249.190	10.18.249.191
104	10.18.249.192/26	10.18.249.193 – 10.18.249.254	10.18.249.255
105	10.18.250.0/26	10.18.250.1 – 10.18.250.62	10.18.250.63
106	10.18.250.64/26	10.18.250.65 – 10.18.250.126	10.18.250.127
107	10.18.250.128/26	10.18.250.129 – 10.18.250.190	10.18.250.191
108	10.18.250.192/26	10.18.250.193 – 10.18.250.254	10.18.250.255
109	10.18.251.0/26	10.18.251.1 – 10.18.251.62	10.18.251.63
110	10.18.251.64/26	10.18.251.65 – 10.18.251.126	10.18.251.127
111	10.18.251.128/26	10.18.251.129 – 10.18.251.190	10.18.251.191
112	10.18.251.192/26	10.18.251.193 – 10.18.251.254	10.18.251.255
113	10.18.252.0/26	10.18.252.1 – 10.18.252.62	10.18.252.63
114	10.18.252.64/26	10.18.252.65 – 10.18.252.126	10.18.252.127
115	10.18.252.128/26	10.18.252.129 – 10.18.252.190	10.18.252.191
116	10.18.252.192/26	10.18.252.193 – 10.18.252.254	10.18.252.255
117	10.18.253.0/26	10.18.253.1 – 10.18.253.62	10.18.253.63
118	10.18.253.64/26	10.18.253.65 – 10.18.253.126	10.18.253.127
119	10.18.253.128/26	10.18.253.129 – 10.18.253.190	10.18.253.191
120	10.18.253.192/26	10.18.253.193 – 10.18.253.254	10.18.253.255
121	10.18.254.0/26	10.18.254.1 – 10.18.254.62	10.18.254.63
122	10.18.254.64/26	10.18.254.65 – 10.18.254.126	10.18.254.127
123	10.18.254.128/26	10.18.254.129 – 10.18.254.190	10.18.254.191
124	10.18.254.192/26	10.18.254.193 – 10.18.254.254	10.18.254.255
125	10.18.255.0/26	10.18.255.1 – 10.18.255.62	10.18.255.63
126	10.18.255.64/26	10.18.255.65 – 10.18.255.126	10.18.255.127
127	10.18.255.128/26	10.18.255.129 – 10.18.255.190	10.18.255.191
128	10.18.255.192/26	10.18.255.193 – 10.18.255.254	10.18.255.255

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 →