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)10.9.112.0/20

network10.9.112.0/20

broadcast10.9.127.255

first host10.9.112.1

last host10.9.127.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.9.112.0/20

address00001010.00001001.01110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001001.01110000.00000000

broadcast00001010.00001001.01111111.11111111

green = network part, grey = host part

hex0x0a097000

decimal168390656

reverse dns0.112.9.10.in-addr.arpa

ipv4-mapped::ffff:a09:7000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.9.112.0/27	10.9.112.1 – 10.9.112.30	10.9.112.31
2	10.9.112.32/27	10.9.112.33 – 10.9.112.62	10.9.112.63
3	10.9.112.64/27	10.9.112.65 – 10.9.112.94	10.9.112.95
4	10.9.112.96/27	10.9.112.97 – 10.9.112.126	10.9.112.127
5	10.9.112.128/27	10.9.112.129 – 10.9.112.158	10.9.112.159
6	10.9.112.160/27	10.9.112.161 – 10.9.112.190	10.9.112.191
7	10.9.112.192/27	10.9.112.193 – 10.9.112.222	10.9.112.223
8	10.9.112.224/27	10.9.112.225 – 10.9.112.254	10.9.112.255
9	10.9.113.0/27	10.9.113.1 – 10.9.113.30	10.9.113.31
10	10.9.113.32/27	10.9.113.33 – 10.9.113.62	10.9.113.63
11	10.9.113.64/27	10.9.113.65 – 10.9.113.94	10.9.113.95
12	10.9.113.96/27	10.9.113.97 – 10.9.113.126	10.9.113.127
13	10.9.113.128/27	10.9.113.129 – 10.9.113.158	10.9.113.159
14	10.9.113.160/27	10.9.113.161 – 10.9.113.190	10.9.113.191
15	10.9.113.192/27	10.9.113.193 – 10.9.113.222	10.9.113.223
16	10.9.113.224/27	10.9.113.225 – 10.9.113.254	10.9.113.255
17	10.9.114.0/27	10.9.114.1 – 10.9.114.30	10.9.114.31
18	10.9.114.32/27	10.9.114.33 – 10.9.114.62	10.9.114.63
19	10.9.114.64/27	10.9.114.65 – 10.9.114.94	10.9.114.95
20	10.9.114.96/27	10.9.114.97 – 10.9.114.126	10.9.114.127
21	10.9.114.128/27	10.9.114.129 – 10.9.114.158	10.9.114.159
22	10.9.114.160/27	10.9.114.161 – 10.9.114.190	10.9.114.191
23	10.9.114.192/27	10.9.114.193 – 10.9.114.222	10.9.114.223
24	10.9.114.224/27	10.9.114.225 – 10.9.114.254	10.9.114.255
25	10.9.115.0/27	10.9.115.1 – 10.9.115.30	10.9.115.31
26	10.9.115.32/27	10.9.115.33 – 10.9.115.62	10.9.115.63
27	10.9.115.64/27	10.9.115.65 – 10.9.115.94	10.9.115.95
28	10.9.115.96/27	10.9.115.97 – 10.9.115.126	10.9.115.127
29	10.9.115.128/27	10.9.115.129 – 10.9.115.158	10.9.115.159
30	10.9.115.160/27	10.9.115.161 – 10.9.115.190	10.9.115.191
31	10.9.115.192/27	10.9.115.193 – 10.9.115.222	10.9.115.223
32	10.9.115.224/27	10.9.115.225 – 10.9.115.254	10.9.115.255
33	10.9.116.0/27	10.9.116.1 – 10.9.116.30	10.9.116.31
34	10.9.116.32/27	10.9.116.33 – 10.9.116.62	10.9.116.63
35	10.9.116.64/27	10.9.116.65 – 10.9.116.94	10.9.116.95
36	10.9.116.96/27	10.9.116.97 – 10.9.116.126	10.9.116.127
37	10.9.116.128/27	10.9.116.129 – 10.9.116.158	10.9.116.159
38	10.9.116.160/27	10.9.116.161 – 10.9.116.190	10.9.116.191
39	10.9.116.192/27	10.9.116.193 – 10.9.116.222	10.9.116.223
40	10.9.116.224/27	10.9.116.225 – 10.9.116.254	10.9.116.255
41	10.9.117.0/27	10.9.117.1 – 10.9.117.30	10.9.117.31
42	10.9.117.32/27	10.9.117.33 – 10.9.117.62	10.9.117.63
43	10.9.117.64/27	10.9.117.65 – 10.9.117.94	10.9.117.95
44	10.9.117.96/27	10.9.117.97 – 10.9.117.126	10.9.117.127
45	10.9.117.128/27	10.9.117.129 – 10.9.117.158	10.9.117.159
46	10.9.117.160/27	10.9.117.161 – 10.9.117.190	10.9.117.191
47	10.9.117.192/27	10.9.117.193 – 10.9.117.222	10.9.117.223
48	10.9.117.224/27	10.9.117.225 – 10.9.117.254	10.9.117.255
49	10.9.118.0/27	10.9.118.1 – 10.9.118.30	10.9.118.31
50	10.9.118.32/27	10.9.118.33 – 10.9.118.62	10.9.118.63
51	10.9.118.64/27	10.9.118.65 – 10.9.118.94	10.9.118.95
52	10.9.118.96/27	10.9.118.97 – 10.9.118.126	10.9.118.127
53	10.9.118.128/27	10.9.118.129 – 10.9.118.158	10.9.118.159
54	10.9.118.160/27	10.9.118.161 – 10.9.118.190	10.9.118.191
55	10.9.118.192/27	10.9.118.193 – 10.9.118.222	10.9.118.223
56	10.9.118.224/27	10.9.118.225 – 10.9.118.254	10.9.118.255
57	10.9.119.0/27	10.9.119.1 – 10.9.119.30	10.9.119.31
58	10.9.119.32/27	10.9.119.33 – 10.9.119.62	10.9.119.63
59	10.9.119.64/27	10.9.119.65 – 10.9.119.94	10.9.119.95
60	10.9.119.96/27	10.9.119.97 – 10.9.119.126	10.9.119.127
61	10.9.119.128/27	10.9.119.129 – 10.9.119.158	10.9.119.159
62	10.9.119.160/27	10.9.119.161 – 10.9.119.190	10.9.119.191
63	10.9.119.192/27	10.9.119.193 – 10.9.119.222	10.9.119.223
64	10.9.119.224/27	10.9.119.225 – 10.9.119.254	10.9.119.255
65	10.9.120.0/27	10.9.120.1 – 10.9.120.30	10.9.120.31
66	10.9.120.32/27	10.9.120.33 – 10.9.120.62	10.9.120.63
67	10.9.120.64/27	10.9.120.65 – 10.9.120.94	10.9.120.95
68	10.9.120.96/27	10.9.120.97 – 10.9.120.126	10.9.120.127
69	10.9.120.128/27	10.9.120.129 – 10.9.120.158	10.9.120.159
70	10.9.120.160/27	10.9.120.161 – 10.9.120.190	10.9.120.191
71	10.9.120.192/27	10.9.120.193 – 10.9.120.222	10.9.120.223
72	10.9.120.224/27	10.9.120.225 – 10.9.120.254	10.9.120.255
73	10.9.121.0/27	10.9.121.1 – 10.9.121.30	10.9.121.31
74	10.9.121.32/27	10.9.121.33 – 10.9.121.62	10.9.121.63
75	10.9.121.64/27	10.9.121.65 – 10.9.121.94	10.9.121.95
76	10.9.121.96/27	10.9.121.97 – 10.9.121.126	10.9.121.127
77	10.9.121.128/27	10.9.121.129 – 10.9.121.158	10.9.121.159
78	10.9.121.160/27	10.9.121.161 – 10.9.121.190	10.9.121.191
79	10.9.121.192/27	10.9.121.193 – 10.9.121.222	10.9.121.223
80	10.9.121.224/27	10.9.121.225 – 10.9.121.254	10.9.121.255
81	10.9.122.0/27	10.9.122.1 – 10.9.122.30	10.9.122.31
82	10.9.122.32/27	10.9.122.33 – 10.9.122.62	10.9.122.63
83	10.9.122.64/27	10.9.122.65 – 10.9.122.94	10.9.122.95
84	10.9.122.96/27	10.9.122.97 – 10.9.122.126	10.9.122.127
85	10.9.122.128/27	10.9.122.129 – 10.9.122.158	10.9.122.159
86	10.9.122.160/27	10.9.122.161 – 10.9.122.190	10.9.122.191
87	10.9.122.192/27	10.9.122.193 – 10.9.122.222	10.9.122.223
88	10.9.122.224/27	10.9.122.225 – 10.9.122.254	10.9.122.255
89	10.9.123.0/27	10.9.123.1 – 10.9.123.30	10.9.123.31
90	10.9.123.32/27	10.9.123.33 – 10.9.123.62	10.9.123.63
91	10.9.123.64/27	10.9.123.65 – 10.9.123.94	10.9.123.95
92	10.9.123.96/27	10.9.123.97 – 10.9.123.126	10.9.123.127
93	10.9.123.128/27	10.9.123.129 – 10.9.123.158	10.9.123.159
94	10.9.123.160/27	10.9.123.161 – 10.9.123.190	10.9.123.191
95	10.9.123.192/27	10.9.123.193 – 10.9.123.222	10.9.123.223
96	10.9.123.224/27	10.9.123.225 – 10.9.123.254	10.9.123.255
97	10.9.124.0/27	10.9.124.1 – 10.9.124.30	10.9.124.31
98	10.9.124.32/27	10.9.124.33 – 10.9.124.62	10.9.124.63
99	10.9.124.64/27	10.9.124.65 – 10.9.124.94	10.9.124.95
100	10.9.124.96/27	10.9.124.97 – 10.9.124.126	10.9.124.127
101	10.9.124.128/27	10.9.124.129 – 10.9.124.158	10.9.124.159
102	10.9.124.160/27	10.9.124.161 – 10.9.124.190	10.9.124.191
103	10.9.124.192/27	10.9.124.193 – 10.9.124.222	10.9.124.223
104	10.9.124.224/27	10.9.124.225 – 10.9.124.254	10.9.124.255
105	10.9.125.0/27	10.9.125.1 – 10.9.125.30	10.9.125.31
106	10.9.125.32/27	10.9.125.33 – 10.9.125.62	10.9.125.63
107	10.9.125.64/27	10.9.125.65 – 10.9.125.94	10.9.125.95
108	10.9.125.96/27	10.9.125.97 – 10.9.125.126	10.9.125.127
109	10.9.125.128/27	10.9.125.129 – 10.9.125.158	10.9.125.159
110	10.9.125.160/27	10.9.125.161 – 10.9.125.190	10.9.125.191
111	10.9.125.192/27	10.9.125.193 – 10.9.125.222	10.9.125.223
112	10.9.125.224/27	10.9.125.225 – 10.9.125.254	10.9.125.255
113	10.9.126.0/27	10.9.126.1 – 10.9.126.30	10.9.126.31
114	10.9.126.32/27	10.9.126.33 – 10.9.126.62	10.9.126.63
115	10.9.126.64/27	10.9.126.65 – 10.9.126.94	10.9.126.95
116	10.9.126.96/27	10.9.126.97 – 10.9.126.126	10.9.126.127
117	10.9.126.128/27	10.9.126.129 – 10.9.126.158	10.9.126.159
118	10.9.126.160/27	10.9.126.161 – 10.9.126.190	10.9.126.191
119	10.9.126.192/27	10.9.126.193 – 10.9.126.222	10.9.126.223
120	10.9.126.224/27	10.9.126.225 – 10.9.126.254	10.9.126.255
121	10.9.127.0/27	10.9.127.1 – 10.9.127.30	10.9.127.31
122	10.9.127.32/27	10.9.127.33 – 10.9.127.62	10.9.127.63
123	10.9.127.64/27	10.9.127.65 – 10.9.127.94	10.9.127.95
124	10.9.127.96/27	10.9.127.97 – 10.9.127.126	10.9.127.127
125	10.9.127.128/27	10.9.127.129 – 10.9.127.158	10.9.127.159
126	10.9.127.160/27	10.9.127.161 – 10.9.127.190	10.9.127.191
127	10.9.127.192/27	10.9.127.193 – 10.9.127.222	10.9.127.223
128	10.9.127.224/27	10.9.127.225 – 10.9.127.254	10.9.127.255

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 →