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)10.5.224.0/20

network10.5.224.0/20

broadcast10.5.239.255

first host10.5.224.1

last host10.5.239.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.5.224.0/20

address00001010.00000101.11100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000101.11100000.00000000

broadcast00001010.00000101.11101111.11111111

green = network part, grey = host part

hex0x0a05e000

decimal168157184

reverse dns0.224.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:e000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.5.224.0/27	10.5.224.1 – 10.5.224.30	10.5.224.31
2	10.5.224.32/27	10.5.224.33 – 10.5.224.62	10.5.224.63
3	10.5.224.64/27	10.5.224.65 – 10.5.224.94	10.5.224.95
4	10.5.224.96/27	10.5.224.97 – 10.5.224.126	10.5.224.127
5	10.5.224.128/27	10.5.224.129 – 10.5.224.158	10.5.224.159
6	10.5.224.160/27	10.5.224.161 – 10.5.224.190	10.5.224.191
7	10.5.224.192/27	10.5.224.193 – 10.5.224.222	10.5.224.223
8	10.5.224.224/27	10.5.224.225 – 10.5.224.254	10.5.224.255
9	10.5.225.0/27	10.5.225.1 – 10.5.225.30	10.5.225.31
10	10.5.225.32/27	10.5.225.33 – 10.5.225.62	10.5.225.63
11	10.5.225.64/27	10.5.225.65 – 10.5.225.94	10.5.225.95
12	10.5.225.96/27	10.5.225.97 – 10.5.225.126	10.5.225.127
13	10.5.225.128/27	10.5.225.129 – 10.5.225.158	10.5.225.159
14	10.5.225.160/27	10.5.225.161 – 10.5.225.190	10.5.225.191
15	10.5.225.192/27	10.5.225.193 – 10.5.225.222	10.5.225.223
16	10.5.225.224/27	10.5.225.225 – 10.5.225.254	10.5.225.255
17	10.5.226.0/27	10.5.226.1 – 10.5.226.30	10.5.226.31
18	10.5.226.32/27	10.5.226.33 – 10.5.226.62	10.5.226.63
19	10.5.226.64/27	10.5.226.65 – 10.5.226.94	10.5.226.95
20	10.5.226.96/27	10.5.226.97 – 10.5.226.126	10.5.226.127
21	10.5.226.128/27	10.5.226.129 – 10.5.226.158	10.5.226.159
22	10.5.226.160/27	10.5.226.161 – 10.5.226.190	10.5.226.191
23	10.5.226.192/27	10.5.226.193 – 10.5.226.222	10.5.226.223
24	10.5.226.224/27	10.5.226.225 – 10.5.226.254	10.5.226.255
25	10.5.227.0/27	10.5.227.1 – 10.5.227.30	10.5.227.31
26	10.5.227.32/27	10.5.227.33 – 10.5.227.62	10.5.227.63
27	10.5.227.64/27	10.5.227.65 – 10.5.227.94	10.5.227.95
28	10.5.227.96/27	10.5.227.97 – 10.5.227.126	10.5.227.127
29	10.5.227.128/27	10.5.227.129 – 10.5.227.158	10.5.227.159
30	10.5.227.160/27	10.5.227.161 – 10.5.227.190	10.5.227.191
31	10.5.227.192/27	10.5.227.193 – 10.5.227.222	10.5.227.223
32	10.5.227.224/27	10.5.227.225 – 10.5.227.254	10.5.227.255
33	10.5.228.0/27	10.5.228.1 – 10.5.228.30	10.5.228.31
34	10.5.228.32/27	10.5.228.33 – 10.5.228.62	10.5.228.63
35	10.5.228.64/27	10.5.228.65 – 10.5.228.94	10.5.228.95
36	10.5.228.96/27	10.5.228.97 – 10.5.228.126	10.5.228.127
37	10.5.228.128/27	10.5.228.129 – 10.5.228.158	10.5.228.159
38	10.5.228.160/27	10.5.228.161 – 10.5.228.190	10.5.228.191
39	10.5.228.192/27	10.5.228.193 – 10.5.228.222	10.5.228.223
40	10.5.228.224/27	10.5.228.225 – 10.5.228.254	10.5.228.255
41	10.5.229.0/27	10.5.229.1 – 10.5.229.30	10.5.229.31
42	10.5.229.32/27	10.5.229.33 – 10.5.229.62	10.5.229.63
43	10.5.229.64/27	10.5.229.65 – 10.5.229.94	10.5.229.95
44	10.5.229.96/27	10.5.229.97 – 10.5.229.126	10.5.229.127
45	10.5.229.128/27	10.5.229.129 – 10.5.229.158	10.5.229.159
46	10.5.229.160/27	10.5.229.161 – 10.5.229.190	10.5.229.191
47	10.5.229.192/27	10.5.229.193 – 10.5.229.222	10.5.229.223
48	10.5.229.224/27	10.5.229.225 – 10.5.229.254	10.5.229.255
49	10.5.230.0/27	10.5.230.1 – 10.5.230.30	10.5.230.31
50	10.5.230.32/27	10.5.230.33 – 10.5.230.62	10.5.230.63
51	10.5.230.64/27	10.5.230.65 – 10.5.230.94	10.5.230.95
52	10.5.230.96/27	10.5.230.97 – 10.5.230.126	10.5.230.127
53	10.5.230.128/27	10.5.230.129 – 10.5.230.158	10.5.230.159
54	10.5.230.160/27	10.5.230.161 – 10.5.230.190	10.5.230.191
55	10.5.230.192/27	10.5.230.193 – 10.5.230.222	10.5.230.223
56	10.5.230.224/27	10.5.230.225 – 10.5.230.254	10.5.230.255
57	10.5.231.0/27	10.5.231.1 – 10.5.231.30	10.5.231.31
58	10.5.231.32/27	10.5.231.33 – 10.5.231.62	10.5.231.63
59	10.5.231.64/27	10.5.231.65 – 10.5.231.94	10.5.231.95
60	10.5.231.96/27	10.5.231.97 – 10.5.231.126	10.5.231.127
61	10.5.231.128/27	10.5.231.129 – 10.5.231.158	10.5.231.159
62	10.5.231.160/27	10.5.231.161 – 10.5.231.190	10.5.231.191
63	10.5.231.192/27	10.5.231.193 – 10.5.231.222	10.5.231.223
64	10.5.231.224/27	10.5.231.225 – 10.5.231.254	10.5.231.255
65	10.5.232.0/27	10.5.232.1 – 10.5.232.30	10.5.232.31
66	10.5.232.32/27	10.5.232.33 – 10.5.232.62	10.5.232.63
67	10.5.232.64/27	10.5.232.65 – 10.5.232.94	10.5.232.95
68	10.5.232.96/27	10.5.232.97 – 10.5.232.126	10.5.232.127
69	10.5.232.128/27	10.5.232.129 – 10.5.232.158	10.5.232.159
70	10.5.232.160/27	10.5.232.161 – 10.5.232.190	10.5.232.191
71	10.5.232.192/27	10.5.232.193 – 10.5.232.222	10.5.232.223
72	10.5.232.224/27	10.5.232.225 – 10.5.232.254	10.5.232.255
73	10.5.233.0/27	10.5.233.1 – 10.5.233.30	10.5.233.31
74	10.5.233.32/27	10.5.233.33 – 10.5.233.62	10.5.233.63
75	10.5.233.64/27	10.5.233.65 – 10.5.233.94	10.5.233.95
76	10.5.233.96/27	10.5.233.97 – 10.5.233.126	10.5.233.127
77	10.5.233.128/27	10.5.233.129 – 10.5.233.158	10.5.233.159
78	10.5.233.160/27	10.5.233.161 – 10.5.233.190	10.5.233.191
79	10.5.233.192/27	10.5.233.193 – 10.5.233.222	10.5.233.223
80	10.5.233.224/27	10.5.233.225 – 10.5.233.254	10.5.233.255
81	10.5.234.0/27	10.5.234.1 – 10.5.234.30	10.5.234.31
82	10.5.234.32/27	10.5.234.33 – 10.5.234.62	10.5.234.63
83	10.5.234.64/27	10.5.234.65 – 10.5.234.94	10.5.234.95
84	10.5.234.96/27	10.5.234.97 – 10.5.234.126	10.5.234.127
85	10.5.234.128/27	10.5.234.129 – 10.5.234.158	10.5.234.159
86	10.5.234.160/27	10.5.234.161 – 10.5.234.190	10.5.234.191
87	10.5.234.192/27	10.5.234.193 – 10.5.234.222	10.5.234.223
88	10.5.234.224/27	10.5.234.225 – 10.5.234.254	10.5.234.255
89	10.5.235.0/27	10.5.235.1 – 10.5.235.30	10.5.235.31
90	10.5.235.32/27	10.5.235.33 – 10.5.235.62	10.5.235.63
91	10.5.235.64/27	10.5.235.65 – 10.5.235.94	10.5.235.95
92	10.5.235.96/27	10.5.235.97 – 10.5.235.126	10.5.235.127
93	10.5.235.128/27	10.5.235.129 – 10.5.235.158	10.5.235.159
94	10.5.235.160/27	10.5.235.161 – 10.5.235.190	10.5.235.191
95	10.5.235.192/27	10.5.235.193 – 10.5.235.222	10.5.235.223
96	10.5.235.224/27	10.5.235.225 – 10.5.235.254	10.5.235.255
97	10.5.236.0/27	10.5.236.1 – 10.5.236.30	10.5.236.31
98	10.5.236.32/27	10.5.236.33 – 10.5.236.62	10.5.236.63
99	10.5.236.64/27	10.5.236.65 – 10.5.236.94	10.5.236.95
100	10.5.236.96/27	10.5.236.97 – 10.5.236.126	10.5.236.127
101	10.5.236.128/27	10.5.236.129 – 10.5.236.158	10.5.236.159
102	10.5.236.160/27	10.5.236.161 – 10.5.236.190	10.5.236.191
103	10.5.236.192/27	10.5.236.193 – 10.5.236.222	10.5.236.223
104	10.5.236.224/27	10.5.236.225 – 10.5.236.254	10.5.236.255
105	10.5.237.0/27	10.5.237.1 – 10.5.237.30	10.5.237.31
106	10.5.237.32/27	10.5.237.33 – 10.5.237.62	10.5.237.63
107	10.5.237.64/27	10.5.237.65 – 10.5.237.94	10.5.237.95
108	10.5.237.96/27	10.5.237.97 – 10.5.237.126	10.5.237.127
109	10.5.237.128/27	10.5.237.129 – 10.5.237.158	10.5.237.159
110	10.5.237.160/27	10.5.237.161 – 10.5.237.190	10.5.237.191
111	10.5.237.192/27	10.5.237.193 – 10.5.237.222	10.5.237.223
112	10.5.237.224/27	10.5.237.225 – 10.5.237.254	10.5.237.255
113	10.5.238.0/27	10.5.238.1 – 10.5.238.30	10.5.238.31
114	10.5.238.32/27	10.5.238.33 – 10.5.238.62	10.5.238.63
115	10.5.238.64/27	10.5.238.65 – 10.5.238.94	10.5.238.95
116	10.5.238.96/27	10.5.238.97 – 10.5.238.126	10.5.238.127
117	10.5.238.128/27	10.5.238.129 – 10.5.238.158	10.5.238.159
118	10.5.238.160/27	10.5.238.161 – 10.5.238.190	10.5.238.191
119	10.5.238.192/27	10.5.238.193 – 10.5.238.222	10.5.238.223
120	10.5.238.224/27	10.5.238.225 – 10.5.238.254	10.5.238.255
121	10.5.239.0/27	10.5.239.1 – 10.5.239.30	10.5.239.31
122	10.5.239.32/27	10.5.239.33 – 10.5.239.62	10.5.239.63
123	10.5.239.64/27	10.5.239.65 – 10.5.239.94	10.5.239.95
124	10.5.239.96/27	10.5.239.97 – 10.5.239.126	10.5.239.127
125	10.5.239.128/27	10.5.239.129 – 10.5.239.158	10.5.239.159
126	10.5.239.160/27	10.5.239.161 – 10.5.239.190	10.5.239.191
127	10.5.239.192/27	10.5.239.193 – 10.5.239.222	10.5.239.223
128	10.5.239.224/27	10.5.239.225 – 10.5.239.254	10.5.239.255

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