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)10.2.176.0/20

network10.2.176.0/20

broadcast10.2.191.255

first host10.2.176.1

last host10.2.191.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.176.0/20

address00001010.00000010.10110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.10110000.00000000

broadcast00001010.00000010.10111111.11111111

green = network part, grey = host part

hex0x0a02b000

decimal167948288

reverse dns0.176.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.176.0/27	10.2.176.1 – 10.2.176.30	10.2.176.31
2	10.2.176.32/27	10.2.176.33 – 10.2.176.62	10.2.176.63
3	10.2.176.64/27	10.2.176.65 – 10.2.176.94	10.2.176.95
4	10.2.176.96/27	10.2.176.97 – 10.2.176.126	10.2.176.127
5	10.2.176.128/27	10.2.176.129 – 10.2.176.158	10.2.176.159
6	10.2.176.160/27	10.2.176.161 – 10.2.176.190	10.2.176.191
7	10.2.176.192/27	10.2.176.193 – 10.2.176.222	10.2.176.223
8	10.2.176.224/27	10.2.176.225 – 10.2.176.254	10.2.176.255
9	10.2.177.0/27	10.2.177.1 – 10.2.177.30	10.2.177.31
10	10.2.177.32/27	10.2.177.33 – 10.2.177.62	10.2.177.63
11	10.2.177.64/27	10.2.177.65 – 10.2.177.94	10.2.177.95
12	10.2.177.96/27	10.2.177.97 – 10.2.177.126	10.2.177.127
13	10.2.177.128/27	10.2.177.129 – 10.2.177.158	10.2.177.159
14	10.2.177.160/27	10.2.177.161 – 10.2.177.190	10.2.177.191
15	10.2.177.192/27	10.2.177.193 – 10.2.177.222	10.2.177.223
16	10.2.177.224/27	10.2.177.225 – 10.2.177.254	10.2.177.255
17	10.2.178.0/27	10.2.178.1 – 10.2.178.30	10.2.178.31
18	10.2.178.32/27	10.2.178.33 – 10.2.178.62	10.2.178.63
19	10.2.178.64/27	10.2.178.65 – 10.2.178.94	10.2.178.95
20	10.2.178.96/27	10.2.178.97 – 10.2.178.126	10.2.178.127
21	10.2.178.128/27	10.2.178.129 – 10.2.178.158	10.2.178.159
22	10.2.178.160/27	10.2.178.161 – 10.2.178.190	10.2.178.191
23	10.2.178.192/27	10.2.178.193 – 10.2.178.222	10.2.178.223
24	10.2.178.224/27	10.2.178.225 – 10.2.178.254	10.2.178.255
25	10.2.179.0/27	10.2.179.1 – 10.2.179.30	10.2.179.31
26	10.2.179.32/27	10.2.179.33 – 10.2.179.62	10.2.179.63
27	10.2.179.64/27	10.2.179.65 – 10.2.179.94	10.2.179.95
28	10.2.179.96/27	10.2.179.97 – 10.2.179.126	10.2.179.127
29	10.2.179.128/27	10.2.179.129 – 10.2.179.158	10.2.179.159
30	10.2.179.160/27	10.2.179.161 – 10.2.179.190	10.2.179.191
31	10.2.179.192/27	10.2.179.193 – 10.2.179.222	10.2.179.223
32	10.2.179.224/27	10.2.179.225 – 10.2.179.254	10.2.179.255
33	10.2.180.0/27	10.2.180.1 – 10.2.180.30	10.2.180.31
34	10.2.180.32/27	10.2.180.33 – 10.2.180.62	10.2.180.63
35	10.2.180.64/27	10.2.180.65 – 10.2.180.94	10.2.180.95
36	10.2.180.96/27	10.2.180.97 – 10.2.180.126	10.2.180.127
37	10.2.180.128/27	10.2.180.129 – 10.2.180.158	10.2.180.159
38	10.2.180.160/27	10.2.180.161 – 10.2.180.190	10.2.180.191
39	10.2.180.192/27	10.2.180.193 – 10.2.180.222	10.2.180.223
40	10.2.180.224/27	10.2.180.225 – 10.2.180.254	10.2.180.255
41	10.2.181.0/27	10.2.181.1 – 10.2.181.30	10.2.181.31
42	10.2.181.32/27	10.2.181.33 – 10.2.181.62	10.2.181.63
43	10.2.181.64/27	10.2.181.65 – 10.2.181.94	10.2.181.95
44	10.2.181.96/27	10.2.181.97 – 10.2.181.126	10.2.181.127
45	10.2.181.128/27	10.2.181.129 – 10.2.181.158	10.2.181.159
46	10.2.181.160/27	10.2.181.161 – 10.2.181.190	10.2.181.191
47	10.2.181.192/27	10.2.181.193 – 10.2.181.222	10.2.181.223
48	10.2.181.224/27	10.2.181.225 – 10.2.181.254	10.2.181.255
49	10.2.182.0/27	10.2.182.1 – 10.2.182.30	10.2.182.31
50	10.2.182.32/27	10.2.182.33 – 10.2.182.62	10.2.182.63
51	10.2.182.64/27	10.2.182.65 – 10.2.182.94	10.2.182.95
52	10.2.182.96/27	10.2.182.97 – 10.2.182.126	10.2.182.127
53	10.2.182.128/27	10.2.182.129 – 10.2.182.158	10.2.182.159
54	10.2.182.160/27	10.2.182.161 – 10.2.182.190	10.2.182.191
55	10.2.182.192/27	10.2.182.193 – 10.2.182.222	10.2.182.223
56	10.2.182.224/27	10.2.182.225 – 10.2.182.254	10.2.182.255
57	10.2.183.0/27	10.2.183.1 – 10.2.183.30	10.2.183.31
58	10.2.183.32/27	10.2.183.33 – 10.2.183.62	10.2.183.63
59	10.2.183.64/27	10.2.183.65 – 10.2.183.94	10.2.183.95
60	10.2.183.96/27	10.2.183.97 – 10.2.183.126	10.2.183.127
61	10.2.183.128/27	10.2.183.129 – 10.2.183.158	10.2.183.159
62	10.2.183.160/27	10.2.183.161 – 10.2.183.190	10.2.183.191
63	10.2.183.192/27	10.2.183.193 – 10.2.183.222	10.2.183.223
64	10.2.183.224/27	10.2.183.225 – 10.2.183.254	10.2.183.255
65	10.2.184.0/27	10.2.184.1 – 10.2.184.30	10.2.184.31
66	10.2.184.32/27	10.2.184.33 – 10.2.184.62	10.2.184.63
67	10.2.184.64/27	10.2.184.65 – 10.2.184.94	10.2.184.95
68	10.2.184.96/27	10.2.184.97 – 10.2.184.126	10.2.184.127
69	10.2.184.128/27	10.2.184.129 – 10.2.184.158	10.2.184.159
70	10.2.184.160/27	10.2.184.161 – 10.2.184.190	10.2.184.191
71	10.2.184.192/27	10.2.184.193 – 10.2.184.222	10.2.184.223
72	10.2.184.224/27	10.2.184.225 – 10.2.184.254	10.2.184.255
73	10.2.185.0/27	10.2.185.1 – 10.2.185.30	10.2.185.31
74	10.2.185.32/27	10.2.185.33 – 10.2.185.62	10.2.185.63
75	10.2.185.64/27	10.2.185.65 – 10.2.185.94	10.2.185.95
76	10.2.185.96/27	10.2.185.97 – 10.2.185.126	10.2.185.127
77	10.2.185.128/27	10.2.185.129 – 10.2.185.158	10.2.185.159
78	10.2.185.160/27	10.2.185.161 – 10.2.185.190	10.2.185.191
79	10.2.185.192/27	10.2.185.193 – 10.2.185.222	10.2.185.223
80	10.2.185.224/27	10.2.185.225 – 10.2.185.254	10.2.185.255
81	10.2.186.0/27	10.2.186.1 – 10.2.186.30	10.2.186.31
82	10.2.186.32/27	10.2.186.33 – 10.2.186.62	10.2.186.63
83	10.2.186.64/27	10.2.186.65 – 10.2.186.94	10.2.186.95
84	10.2.186.96/27	10.2.186.97 – 10.2.186.126	10.2.186.127
85	10.2.186.128/27	10.2.186.129 – 10.2.186.158	10.2.186.159
86	10.2.186.160/27	10.2.186.161 – 10.2.186.190	10.2.186.191
87	10.2.186.192/27	10.2.186.193 – 10.2.186.222	10.2.186.223
88	10.2.186.224/27	10.2.186.225 – 10.2.186.254	10.2.186.255
89	10.2.187.0/27	10.2.187.1 – 10.2.187.30	10.2.187.31
90	10.2.187.32/27	10.2.187.33 – 10.2.187.62	10.2.187.63
91	10.2.187.64/27	10.2.187.65 – 10.2.187.94	10.2.187.95
92	10.2.187.96/27	10.2.187.97 – 10.2.187.126	10.2.187.127
93	10.2.187.128/27	10.2.187.129 – 10.2.187.158	10.2.187.159
94	10.2.187.160/27	10.2.187.161 – 10.2.187.190	10.2.187.191
95	10.2.187.192/27	10.2.187.193 – 10.2.187.222	10.2.187.223
96	10.2.187.224/27	10.2.187.225 – 10.2.187.254	10.2.187.255
97	10.2.188.0/27	10.2.188.1 – 10.2.188.30	10.2.188.31
98	10.2.188.32/27	10.2.188.33 – 10.2.188.62	10.2.188.63
99	10.2.188.64/27	10.2.188.65 – 10.2.188.94	10.2.188.95
100	10.2.188.96/27	10.2.188.97 – 10.2.188.126	10.2.188.127
101	10.2.188.128/27	10.2.188.129 – 10.2.188.158	10.2.188.159
102	10.2.188.160/27	10.2.188.161 – 10.2.188.190	10.2.188.191
103	10.2.188.192/27	10.2.188.193 – 10.2.188.222	10.2.188.223
104	10.2.188.224/27	10.2.188.225 – 10.2.188.254	10.2.188.255
105	10.2.189.0/27	10.2.189.1 – 10.2.189.30	10.2.189.31
106	10.2.189.32/27	10.2.189.33 – 10.2.189.62	10.2.189.63
107	10.2.189.64/27	10.2.189.65 – 10.2.189.94	10.2.189.95
108	10.2.189.96/27	10.2.189.97 – 10.2.189.126	10.2.189.127
109	10.2.189.128/27	10.2.189.129 – 10.2.189.158	10.2.189.159
110	10.2.189.160/27	10.2.189.161 – 10.2.189.190	10.2.189.191
111	10.2.189.192/27	10.2.189.193 – 10.2.189.222	10.2.189.223
112	10.2.189.224/27	10.2.189.225 – 10.2.189.254	10.2.189.255
113	10.2.190.0/27	10.2.190.1 – 10.2.190.30	10.2.190.31
114	10.2.190.32/27	10.2.190.33 – 10.2.190.62	10.2.190.63
115	10.2.190.64/27	10.2.190.65 – 10.2.190.94	10.2.190.95
116	10.2.190.96/27	10.2.190.97 – 10.2.190.126	10.2.190.127
117	10.2.190.128/27	10.2.190.129 – 10.2.190.158	10.2.190.159
118	10.2.190.160/27	10.2.190.161 – 10.2.190.190	10.2.190.191
119	10.2.190.192/27	10.2.190.193 – 10.2.190.222	10.2.190.223
120	10.2.190.224/27	10.2.190.225 – 10.2.190.254	10.2.190.255
121	10.2.191.0/27	10.2.191.1 – 10.2.191.30	10.2.191.31
122	10.2.191.32/27	10.2.191.33 – 10.2.191.62	10.2.191.63
123	10.2.191.64/27	10.2.191.65 – 10.2.191.94	10.2.191.95
124	10.2.191.96/27	10.2.191.97 – 10.2.191.126	10.2.191.127
125	10.2.191.128/27	10.2.191.129 – 10.2.191.158	10.2.191.159
126	10.2.191.160/27	10.2.191.161 – 10.2.191.190	10.2.191.191
127	10.2.191.192/27	10.2.191.193 – 10.2.191.222	10.2.191.223
128	10.2.191.224/27	10.2.191.225 – 10.2.191.254	10.2.191.255

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 /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 →