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)10.78.176.0/20

network10.78.176.0/20

broadcast10.78.191.255

first host10.78.176.1

last host10.78.191.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.78.176.0/20

address00001010.01001110.10110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.01001110.10110000.00000000

broadcast00001010.01001110.10111111.11111111

green = network part, grey = host part

hex0x0a4eb000

decimal172929024

reverse dns0.176.78.10.in-addr.arpa

ipv4-mapped::ffff:a4e:b000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.78.176.0/27	10.78.176.1 – 10.78.176.30	10.78.176.31
2	10.78.176.32/27	10.78.176.33 – 10.78.176.62	10.78.176.63
3	10.78.176.64/27	10.78.176.65 – 10.78.176.94	10.78.176.95
4	10.78.176.96/27	10.78.176.97 – 10.78.176.126	10.78.176.127
5	10.78.176.128/27	10.78.176.129 – 10.78.176.158	10.78.176.159
6	10.78.176.160/27	10.78.176.161 – 10.78.176.190	10.78.176.191
7	10.78.176.192/27	10.78.176.193 – 10.78.176.222	10.78.176.223
8	10.78.176.224/27	10.78.176.225 – 10.78.176.254	10.78.176.255
9	10.78.177.0/27	10.78.177.1 – 10.78.177.30	10.78.177.31
10	10.78.177.32/27	10.78.177.33 – 10.78.177.62	10.78.177.63
11	10.78.177.64/27	10.78.177.65 – 10.78.177.94	10.78.177.95
12	10.78.177.96/27	10.78.177.97 – 10.78.177.126	10.78.177.127
13	10.78.177.128/27	10.78.177.129 – 10.78.177.158	10.78.177.159
14	10.78.177.160/27	10.78.177.161 – 10.78.177.190	10.78.177.191
15	10.78.177.192/27	10.78.177.193 – 10.78.177.222	10.78.177.223
16	10.78.177.224/27	10.78.177.225 – 10.78.177.254	10.78.177.255
17	10.78.178.0/27	10.78.178.1 – 10.78.178.30	10.78.178.31
18	10.78.178.32/27	10.78.178.33 – 10.78.178.62	10.78.178.63
19	10.78.178.64/27	10.78.178.65 – 10.78.178.94	10.78.178.95
20	10.78.178.96/27	10.78.178.97 – 10.78.178.126	10.78.178.127
21	10.78.178.128/27	10.78.178.129 – 10.78.178.158	10.78.178.159
22	10.78.178.160/27	10.78.178.161 – 10.78.178.190	10.78.178.191
23	10.78.178.192/27	10.78.178.193 – 10.78.178.222	10.78.178.223
24	10.78.178.224/27	10.78.178.225 – 10.78.178.254	10.78.178.255
25	10.78.179.0/27	10.78.179.1 – 10.78.179.30	10.78.179.31
26	10.78.179.32/27	10.78.179.33 – 10.78.179.62	10.78.179.63
27	10.78.179.64/27	10.78.179.65 – 10.78.179.94	10.78.179.95
28	10.78.179.96/27	10.78.179.97 – 10.78.179.126	10.78.179.127
29	10.78.179.128/27	10.78.179.129 – 10.78.179.158	10.78.179.159
30	10.78.179.160/27	10.78.179.161 – 10.78.179.190	10.78.179.191
31	10.78.179.192/27	10.78.179.193 – 10.78.179.222	10.78.179.223
32	10.78.179.224/27	10.78.179.225 – 10.78.179.254	10.78.179.255
33	10.78.180.0/27	10.78.180.1 – 10.78.180.30	10.78.180.31
34	10.78.180.32/27	10.78.180.33 – 10.78.180.62	10.78.180.63
35	10.78.180.64/27	10.78.180.65 – 10.78.180.94	10.78.180.95
36	10.78.180.96/27	10.78.180.97 – 10.78.180.126	10.78.180.127
37	10.78.180.128/27	10.78.180.129 – 10.78.180.158	10.78.180.159
38	10.78.180.160/27	10.78.180.161 – 10.78.180.190	10.78.180.191
39	10.78.180.192/27	10.78.180.193 – 10.78.180.222	10.78.180.223
40	10.78.180.224/27	10.78.180.225 – 10.78.180.254	10.78.180.255
41	10.78.181.0/27	10.78.181.1 – 10.78.181.30	10.78.181.31
42	10.78.181.32/27	10.78.181.33 – 10.78.181.62	10.78.181.63
43	10.78.181.64/27	10.78.181.65 – 10.78.181.94	10.78.181.95
44	10.78.181.96/27	10.78.181.97 – 10.78.181.126	10.78.181.127
45	10.78.181.128/27	10.78.181.129 – 10.78.181.158	10.78.181.159
46	10.78.181.160/27	10.78.181.161 – 10.78.181.190	10.78.181.191
47	10.78.181.192/27	10.78.181.193 – 10.78.181.222	10.78.181.223
48	10.78.181.224/27	10.78.181.225 – 10.78.181.254	10.78.181.255
49	10.78.182.0/27	10.78.182.1 – 10.78.182.30	10.78.182.31
50	10.78.182.32/27	10.78.182.33 – 10.78.182.62	10.78.182.63
51	10.78.182.64/27	10.78.182.65 – 10.78.182.94	10.78.182.95
52	10.78.182.96/27	10.78.182.97 – 10.78.182.126	10.78.182.127
53	10.78.182.128/27	10.78.182.129 – 10.78.182.158	10.78.182.159
54	10.78.182.160/27	10.78.182.161 – 10.78.182.190	10.78.182.191
55	10.78.182.192/27	10.78.182.193 – 10.78.182.222	10.78.182.223
56	10.78.182.224/27	10.78.182.225 – 10.78.182.254	10.78.182.255
57	10.78.183.0/27	10.78.183.1 – 10.78.183.30	10.78.183.31
58	10.78.183.32/27	10.78.183.33 – 10.78.183.62	10.78.183.63
59	10.78.183.64/27	10.78.183.65 – 10.78.183.94	10.78.183.95
60	10.78.183.96/27	10.78.183.97 – 10.78.183.126	10.78.183.127
61	10.78.183.128/27	10.78.183.129 – 10.78.183.158	10.78.183.159
62	10.78.183.160/27	10.78.183.161 – 10.78.183.190	10.78.183.191
63	10.78.183.192/27	10.78.183.193 – 10.78.183.222	10.78.183.223
64	10.78.183.224/27	10.78.183.225 – 10.78.183.254	10.78.183.255
65	10.78.184.0/27	10.78.184.1 – 10.78.184.30	10.78.184.31
66	10.78.184.32/27	10.78.184.33 – 10.78.184.62	10.78.184.63
67	10.78.184.64/27	10.78.184.65 – 10.78.184.94	10.78.184.95
68	10.78.184.96/27	10.78.184.97 – 10.78.184.126	10.78.184.127
69	10.78.184.128/27	10.78.184.129 – 10.78.184.158	10.78.184.159
70	10.78.184.160/27	10.78.184.161 – 10.78.184.190	10.78.184.191
71	10.78.184.192/27	10.78.184.193 – 10.78.184.222	10.78.184.223
72	10.78.184.224/27	10.78.184.225 – 10.78.184.254	10.78.184.255
73	10.78.185.0/27	10.78.185.1 – 10.78.185.30	10.78.185.31
74	10.78.185.32/27	10.78.185.33 – 10.78.185.62	10.78.185.63
75	10.78.185.64/27	10.78.185.65 – 10.78.185.94	10.78.185.95
76	10.78.185.96/27	10.78.185.97 – 10.78.185.126	10.78.185.127
77	10.78.185.128/27	10.78.185.129 – 10.78.185.158	10.78.185.159
78	10.78.185.160/27	10.78.185.161 – 10.78.185.190	10.78.185.191
79	10.78.185.192/27	10.78.185.193 – 10.78.185.222	10.78.185.223
80	10.78.185.224/27	10.78.185.225 – 10.78.185.254	10.78.185.255
81	10.78.186.0/27	10.78.186.1 – 10.78.186.30	10.78.186.31
82	10.78.186.32/27	10.78.186.33 – 10.78.186.62	10.78.186.63
83	10.78.186.64/27	10.78.186.65 – 10.78.186.94	10.78.186.95
84	10.78.186.96/27	10.78.186.97 – 10.78.186.126	10.78.186.127
85	10.78.186.128/27	10.78.186.129 – 10.78.186.158	10.78.186.159
86	10.78.186.160/27	10.78.186.161 – 10.78.186.190	10.78.186.191
87	10.78.186.192/27	10.78.186.193 – 10.78.186.222	10.78.186.223
88	10.78.186.224/27	10.78.186.225 – 10.78.186.254	10.78.186.255
89	10.78.187.0/27	10.78.187.1 – 10.78.187.30	10.78.187.31
90	10.78.187.32/27	10.78.187.33 – 10.78.187.62	10.78.187.63
91	10.78.187.64/27	10.78.187.65 – 10.78.187.94	10.78.187.95
92	10.78.187.96/27	10.78.187.97 – 10.78.187.126	10.78.187.127
93	10.78.187.128/27	10.78.187.129 – 10.78.187.158	10.78.187.159
94	10.78.187.160/27	10.78.187.161 – 10.78.187.190	10.78.187.191
95	10.78.187.192/27	10.78.187.193 – 10.78.187.222	10.78.187.223
96	10.78.187.224/27	10.78.187.225 – 10.78.187.254	10.78.187.255
97	10.78.188.0/27	10.78.188.1 – 10.78.188.30	10.78.188.31
98	10.78.188.32/27	10.78.188.33 – 10.78.188.62	10.78.188.63
99	10.78.188.64/27	10.78.188.65 – 10.78.188.94	10.78.188.95
100	10.78.188.96/27	10.78.188.97 – 10.78.188.126	10.78.188.127
101	10.78.188.128/27	10.78.188.129 – 10.78.188.158	10.78.188.159
102	10.78.188.160/27	10.78.188.161 – 10.78.188.190	10.78.188.191
103	10.78.188.192/27	10.78.188.193 – 10.78.188.222	10.78.188.223
104	10.78.188.224/27	10.78.188.225 – 10.78.188.254	10.78.188.255
105	10.78.189.0/27	10.78.189.1 – 10.78.189.30	10.78.189.31
106	10.78.189.32/27	10.78.189.33 – 10.78.189.62	10.78.189.63
107	10.78.189.64/27	10.78.189.65 – 10.78.189.94	10.78.189.95
108	10.78.189.96/27	10.78.189.97 – 10.78.189.126	10.78.189.127
109	10.78.189.128/27	10.78.189.129 – 10.78.189.158	10.78.189.159
110	10.78.189.160/27	10.78.189.161 – 10.78.189.190	10.78.189.191
111	10.78.189.192/27	10.78.189.193 – 10.78.189.222	10.78.189.223
112	10.78.189.224/27	10.78.189.225 – 10.78.189.254	10.78.189.255
113	10.78.190.0/27	10.78.190.1 – 10.78.190.30	10.78.190.31
114	10.78.190.32/27	10.78.190.33 – 10.78.190.62	10.78.190.63
115	10.78.190.64/27	10.78.190.65 – 10.78.190.94	10.78.190.95
116	10.78.190.96/27	10.78.190.97 – 10.78.190.126	10.78.190.127
117	10.78.190.128/27	10.78.190.129 – 10.78.190.158	10.78.190.159
118	10.78.190.160/27	10.78.190.161 – 10.78.190.190	10.78.190.191
119	10.78.190.192/27	10.78.190.193 – 10.78.190.222	10.78.190.223
120	10.78.190.224/27	10.78.190.225 – 10.78.190.254	10.78.190.255
121	10.78.191.0/27	10.78.191.1 – 10.78.191.30	10.78.191.31
122	10.78.191.32/27	10.78.191.33 – 10.78.191.62	10.78.191.63
123	10.78.191.64/27	10.78.191.65 – 10.78.191.94	10.78.191.95
124	10.78.191.96/27	10.78.191.97 – 10.78.191.126	10.78.191.127
125	10.78.191.128/27	10.78.191.129 – 10.78.191.158	10.78.191.159
126	10.78.191.160/27	10.78.191.161 – 10.78.191.190	10.78.191.191
127	10.78.191.192/27	10.78.191.193 – 10.78.191.222	10.78.191.223
128	10.78.191.224/27	10.78.191.225 – 10.78.191.254	10.78.191.255

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 →