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)10.0.224.0/20

network10.0.224.0/20

broadcast10.0.239.255

first host10.0.224.1

last host10.0.239.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.0.224.0/20

address00001010.00000000.11100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000000.11100000.00000000

broadcast00001010.00000000.11101111.11111111

green = network part, grey = host part

hex0x0a00e000

decimal167829504

reverse dns0.224.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:e000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.224.0/27	10.0.224.1 – 10.0.224.30	10.0.224.31
2	10.0.224.32/27	10.0.224.33 – 10.0.224.62	10.0.224.63
3	10.0.224.64/27	10.0.224.65 – 10.0.224.94	10.0.224.95
4	10.0.224.96/27	10.0.224.97 – 10.0.224.126	10.0.224.127
5	10.0.224.128/27	10.0.224.129 – 10.0.224.158	10.0.224.159
6	10.0.224.160/27	10.0.224.161 – 10.0.224.190	10.0.224.191
7	10.0.224.192/27	10.0.224.193 – 10.0.224.222	10.0.224.223
8	10.0.224.224/27	10.0.224.225 – 10.0.224.254	10.0.224.255
9	10.0.225.0/27	10.0.225.1 – 10.0.225.30	10.0.225.31
10	10.0.225.32/27	10.0.225.33 – 10.0.225.62	10.0.225.63
11	10.0.225.64/27	10.0.225.65 – 10.0.225.94	10.0.225.95
12	10.0.225.96/27	10.0.225.97 – 10.0.225.126	10.0.225.127
13	10.0.225.128/27	10.0.225.129 – 10.0.225.158	10.0.225.159
14	10.0.225.160/27	10.0.225.161 – 10.0.225.190	10.0.225.191
15	10.0.225.192/27	10.0.225.193 – 10.0.225.222	10.0.225.223
16	10.0.225.224/27	10.0.225.225 – 10.0.225.254	10.0.225.255
17	10.0.226.0/27	10.0.226.1 – 10.0.226.30	10.0.226.31
18	10.0.226.32/27	10.0.226.33 – 10.0.226.62	10.0.226.63
19	10.0.226.64/27	10.0.226.65 – 10.0.226.94	10.0.226.95
20	10.0.226.96/27	10.0.226.97 – 10.0.226.126	10.0.226.127
21	10.0.226.128/27	10.0.226.129 – 10.0.226.158	10.0.226.159
22	10.0.226.160/27	10.0.226.161 – 10.0.226.190	10.0.226.191
23	10.0.226.192/27	10.0.226.193 – 10.0.226.222	10.0.226.223
24	10.0.226.224/27	10.0.226.225 – 10.0.226.254	10.0.226.255
25	10.0.227.0/27	10.0.227.1 – 10.0.227.30	10.0.227.31
26	10.0.227.32/27	10.0.227.33 – 10.0.227.62	10.0.227.63
27	10.0.227.64/27	10.0.227.65 – 10.0.227.94	10.0.227.95
28	10.0.227.96/27	10.0.227.97 – 10.0.227.126	10.0.227.127
29	10.0.227.128/27	10.0.227.129 – 10.0.227.158	10.0.227.159
30	10.0.227.160/27	10.0.227.161 – 10.0.227.190	10.0.227.191
31	10.0.227.192/27	10.0.227.193 – 10.0.227.222	10.0.227.223
32	10.0.227.224/27	10.0.227.225 – 10.0.227.254	10.0.227.255
33	10.0.228.0/27	10.0.228.1 – 10.0.228.30	10.0.228.31
34	10.0.228.32/27	10.0.228.33 – 10.0.228.62	10.0.228.63
35	10.0.228.64/27	10.0.228.65 – 10.0.228.94	10.0.228.95
36	10.0.228.96/27	10.0.228.97 – 10.0.228.126	10.0.228.127
37	10.0.228.128/27	10.0.228.129 – 10.0.228.158	10.0.228.159
38	10.0.228.160/27	10.0.228.161 – 10.0.228.190	10.0.228.191
39	10.0.228.192/27	10.0.228.193 – 10.0.228.222	10.0.228.223
40	10.0.228.224/27	10.0.228.225 – 10.0.228.254	10.0.228.255
41	10.0.229.0/27	10.0.229.1 – 10.0.229.30	10.0.229.31
42	10.0.229.32/27	10.0.229.33 – 10.0.229.62	10.0.229.63
43	10.0.229.64/27	10.0.229.65 – 10.0.229.94	10.0.229.95
44	10.0.229.96/27	10.0.229.97 – 10.0.229.126	10.0.229.127
45	10.0.229.128/27	10.0.229.129 – 10.0.229.158	10.0.229.159
46	10.0.229.160/27	10.0.229.161 – 10.0.229.190	10.0.229.191
47	10.0.229.192/27	10.0.229.193 – 10.0.229.222	10.0.229.223
48	10.0.229.224/27	10.0.229.225 – 10.0.229.254	10.0.229.255
49	10.0.230.0/27	10.0.230.1 – 10.0.230.30	10.0.230.31
50	10.0.230.32/27	10.0.230.33 – 10.0.230.62	10.0.230.63
51	10.0.230.64/27	10.0.230.65 – 10.0.230.94	10.0.230.95
52	10.0.230.96/27	10.0.230.97 – 10.0.230.126	10.0.230.127
53	10.0.230.128/27	10.0.230.129 – 10.0.230.158	10.0.230.159
54	10.0.230.160/27	10.0.230.161 – 10.0.230.190	10.0.230.191
55	10.0.230.192/27	10.0.230.193 – 10.0.230.222	10.0.230.223
56	10.0.230.224/27	10.0.230.225 – 10.0.230.254	10.0.230.255
57	10.0.231.0/27	10.0.231.1 – 10.0.231.30	10.0.231.31
58	10.0.231.32/27	10.0.231.33 – 10.0.231.62	10.0.231.63
59	10.0.231.64/27	10.0.231.65 – 10.0.231.94	10.0.231.95
60	10.0.231.96/27	10.0.231.97 – 10.0.231.126	10.0.231.127
61	10.0.231.128/27	10.0.231.129 – 10.0.231.158	10.0.231.159
62	10.0.231.160/27	10.0.231.161 – 10.0.231.190	10.0.231.191
63	10.0.231.192/27	10.0.231.193 – 10.0.231.222	10.0.231.223
64	10.0.231.224/27	10.0.231.225 – 10.0.231.254	10.0.231.255
65	10.0.232.0/27	10.0.232.1 – 10.0.232.30	10.0.232.31
66	10.0.232.32/27	10.0.232.33 – 10.0.232.62	10.0.232.63
67	10.0.232.64/27	10.0.232.65 – 10.0.232.94	10.0.232.95
68	10.0.232.96/27	10.0.232.97 – 10.0.232.126	10.0.232.127
69	10.0.232.128/27	10.0.232.129 – 10.0.232.158	10.0.232.159
70	10.0.232.160/27	10.0.232.161 – 10.0.232.190	10.0.232.191
71	10.0.232.192/27	10.0.232.193 – 10.0.232.222	10.0.232.223
72	10.0.232.224/27	10.0.232.225 – 10.0.232.254	10.0.232.255
73	10.0.233.0/27	10.0.233.1 – 10.0.233.30	10.0.233.31
74	10.0.233.32/27	10.0.233.33 – 10.0.233.62	10.0.233.63
75	10.0.233.64/27	10.0.233.65 – 10.0.233.94	10.0.233.95
76	10.0.233.96/27	10.0.233.97 – 10.0.233.126	10.0.233.127
77	10.0.233.128/27	10.0.233.129 – 10.0.233.158	10.0.233.159
78	10.0.233.160/27	10.0.233.161 – 10.0.233.190	10.0.233.191
79	10.0.233.192/27	10.0.233.193 – 10.0.233.222	10.0.233.223
80	10.0.233.224/27	10.0.233.225 – 10.0.233.254	10.0.233.255
81	10.0.234.0/27	10.0.234.1 – 10.0.234.30	10.0.234.31
82	10.0.234.32/27	10.0.234.33 – 10.0.234.62	10.0.234.63
83	10.0.234.64/27	10.0.234.65 – 10.0.234.94	10.0.234.95
84	10.0.234.96/27	10.0.234.97 – 10.0.234.126	10.0.234.127
85	10.0.234.128/27	10.0.234.129 – 10.0.234.158	10.0.234.159
86	10.0.234.160/27	10.0.234.161 – 10.0.234.190	10.0.234.191
87	10.0.234.192/27	10.0.234.193 – 10.0.234.222	10.0.234.223
88	10.0.234.224/27	10.0.234.225 – 10.0.234.254	10.0.234.255
89	10.0.235.0/27	10.0.235.1 – 10.0.235.30	10.0.235.31
90	10.0.235.32/27	10.0.235.33 – 10.0.235.62	10.0.235.63
91	10.0.235.64/27	10.0.235.65 – 10.0.235.94	10.0.235.95
92	10.0.235.96/27	10.0.235.97 – 10.0.235.126	10.0.235.127
93	10.0.235.128/27	10.0.235.129 – 10.0.235.158	10.0.235.159
94	10.0.235.160/27	10.0.235.161 – 10.0.235.190	10.0.235.191
95	10.0.235.192/27	10.0.235.193 – 10.0.235.222	10.0.235.223
96	10.0.235.224/27	10.0.235.225 – 10.0.235.254	10.0.235.255
97	10.0.236.0/27	10.0.236.1 – 10.0.236.30	10.0.236.31
98	10.0.236.32/27	10.0.236.33 – 10.0.236.62	10.0.236.63
99	10.0.236.64/27	10.0.236.65 – 10.0.236.94	10.0.236.95
100	10.0.236.96/27	10.0.236.97 – 10.0.236.126	10.0.236.127
101	10.0.236.128/27	10.0.236.129 – 10.0.236.158	10.0.236.159
102	10.0.236.160/27	10.0.236.161 – 10.0.236.190	10.0.236.191
103	10.0.236.192/27	10.0.236.193 – 10.0.236.222	10.0.236.223
104	10.0.236.224/27	10.0.236.225 – 10.0.236.254	10.0.236.255
105	10.0.237.0/27	10.0.237.1 – 10.0.237.30	10.0.237.31
106	10.0.237.32/27	10.0.237.33 – 10.0.237.62	10.0.237.63
107	10.0.237.64/27	10.0.237.65 – 10.0.237.94	10.0.237.95
108	10.0.237.96/27	10.0.237.97 – 10.0.237.126	10.0.237.127
109	10.0.237.128/27	10.0.237.129 – 10.0.237.158	10.0.237.159
110	10.0.237.160/27	10.0.237.161 – 10.0.237.190	10.0.237.191
111	10.0.237.192/27	10.0.237.193 – 10.0.237.222	10.0.237.223
112	10.0.237.224/27	10.0.237.225 – 10.0.237.254	10.0.237.255
113	10.0.238.0/27	10.0.238.1 – 10.0.238.30	10.0.238.31
114	10.0.238.32/27	10.0.238.33 – 10.0.238.62	10.0.238.63
115	10.0.238.64/27	10.0.238.65 – 10.0.238.94	10.0.238.95
116	10.0.238.96/27	10.0.238.97 – 10.0.238.126	10.0.238.127
117	10.0.238.128/27	10.0.238.129 – 10.0.238.158	10.0.238.159
118	10.0.238.160/27	10.0.238.161 – 10.0.238.190	10.0.238.191
119	10.0.238.192/27	10.0.238.193 – 10.0.238.222	10.0.238.223
120	10.0.238.224/27	10.0.238.225 – 10.0.238.254	10.0.238.255
121	10.0.239.0/27	10.0.239.1 – 10.0.239.30	10.0.239.31
122	10.0.239.32/27	10.0.239.33 – 10.0.239.62	10.0.239.63
123	10.0.239.64/27	10.0.239.65 – 10.0.239.94	10.0.239.95
124	10.0.239.96/27	10.0.239.97 – 10.0.239.126	10.0.239.127
125	10.0.239.128/27	10.0.239.129 – 10.0.239.158	10.0.239.159
126	10.0.239.160/27	10.0.239.161 – 10.0.239.190	10.0.239.191
127	10.0.239.192/27	10.0.239.193 – 10.0.239.222	10.0.239.223
128	10.0.239.224/27	10.0.239.225 – 10.0.239.254	10.0.239.255

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 →