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)10.15.160.0/20

network10.15.160.0/20

broadcast10.15.175.255

first host10.15.160.1

last host10.15.175.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.15.160.0/20

address00001010.00001111.10100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00001111.10100000.00000000

broadcast00001010.00001111.10101111.11111111

green = network part, grey = host part

hex0x0a0fa000

decimal168796160

reverse dns0.160.15.10.in-addr.arpa

ipv4-mapped::ffff:a0f:a000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.15.160.0/27	10.15.160.1 – 10.15.160.30	10.15.160.31
2	10.15.160.32/27	10.15.160.33 – 10.15.160.62	10.15.160.63
3	10.15.160.64/27	10.15.160.65 – 10.15.160.94	10.15.160.95
4	10.15.160.96/27	10.15.160.97 – 10.15.160.126	10.15.160.127
5	10.15.160.128/27	10.15.160.129 – 10.15.160.158	10.15.160.159
6	10.15.160.160/27	10.15.160.161 – 10.15.160.190	10.15.160.191
7	10.15.160.192/27	10.15.160.193 – 10.15.160.222	10.15.160.223
8	10.15.160.224/27	10.15.160.225 – 10.15.160.254	10.15.160.255
9	10.15.161.0/27	10.15.161.1 – 10.15.161.30	10.15.161.31
10	10.15.161.32/27	10.15.161.33 – 10.15.161.62	10.15.161.63
11	10.15.161.64/27	10.15.161.65 – 10.15.161.94	10.15.161.95
12	10.15.161.96/27	10.15.161.97 – 10.15.161.126	10.15.161.127
13	10.15.161.128/27	10.15.161.129 – 10.15.161.158	10.15.161.159
14	10.15.161.160/27	10.15.161.161 – 10.15.161.190	10.15.161.191
15	10.15.161.192/27	10.15.161.193 – 10.15.161.222	10.15.161.223
16	10.15.161.224/27	10.15.161.225 – 10.15.161.254	10.15.161.255
17	10.15.162.0/27	10.15.162.1 – 10.15.162.30	10.15.162.31
18	10.15.162.32/27	10.15.162.33 – 10.15.162.62	10.15.162.63
19	10.15.162.64/27	10.15.162.65 – 10.15.162.94	10.15.162.95
20	10.15.162.96/27	10.15.162.97 – 10.15.162.126	10.15.162.127
21	10.15.162.128/27	10.15.162.129 – 10.15.162.158	10.15.162.159
22	10.15.162.160/27	10.15.162.161 – 10.15.162.190	10.15.162.191
23	10.15.162.192/27	10.15.162.193 – 10.15.162.222	10.15.162.223
24	10.15.162.224/27	10.15.162.225 – 10.15.162.254	10.15.162.255
25	10.15.163.0/27	10.15.163.1 – 10.15.163.30	10.15.163.31
26	10.15.163.32/27	10.15.163.33 – 10.15.163.62	10.15.163.63
27	10.15.163.64/27	10.15.163.65 – 10.15.163.94	10.15.163.95
28	10.15.163.96/27	10.15.163.97 – 10.15.163.126	10.15.163.127
29	10.15.163.128/27	10.15.163.129 – 10.15.163.158	10.15.163.159
30	10.15.163.160/27	10.15.163.161 – 10.15.163.190	10.15.163.191
31	10.15.163.192/27	10.15.163.193 – 10.15.163.222	10.15.163.223
32	10.15.163.224/27	10.15.163.225 – 10.15.163.254	10.15.163.255
33	10.15.164.0/27	10.15.164.1 – 10.15.164.30	10.15.164.31
34	10.15.164.32/27	10.15.164.33 – 10.15.164.62	10.15.164.63
35	10.15.164.64/27	10.15.164.65 – 10.15.164.94	10.15.164.95
36	10.15.164.96/27	10.15.164.97 – 10.15.164.126	10.15.164.127
37	10.15.164.128/27	10.15.164.129 – 10.15.164.158	10.15.164.159
38	10.15.164.160/27	10.15.164.161 – 10.15.164.190	10.15.164.191
39	10.15.164.192/27	10.15.164.193 – 10.15.164.222	10.15.164.223
40	10.15.164.224/27	10.15.164.225 – 10.15.164.254	10.15.164.255
41	10.15.165.0/27	10.15.165.1 – 10.15.165.30	10.15.165.31
42	10.15.165.32/27	10.15.165.33 – 10.15.165.62	10.15.165.63
43	10.15.165.64/27	10.15.165.65 – 10.15.165.94	10.15.165.95
44	10.15.165.96/27	10.15.165.97 – 10.15.165.126	10.15.165.127
45	10.15.165.128/27	10.15.165.129 – 10.15.165.158	10.15.165.159
46	10.15.165.160/27	10.15.165.161 – 10.15.165.190	10.15.165.191
47	10.15.165.192/27	10.15.165.193 – 10.15.165.222	10.15.165.223
48	10.15.165.224/27	10.15.165.225 – 10.15.165.254	10.15.165.255
49	10.15.166.0/27	10.15.166.1 – 10.15.166.30	10.15.166.31
50	10.15.166.32/27	10.15.166.33 – 10.15.166.62	10.15.166.63
51	10.15.166.64/27	10.15.166.65 – 10.15.166.94	10.15.166.95
52	10.15.166.96/27	10.15.166.97 – 10.15.166.126	10.15.166.127
53	10.15.166.128/27	10.15.166.129 – 10.15.166.158	10.15.166.159
54	10.15.166.160/27	10.15.166.161 – 10.15.166.190	10.15.166.191
55	10.15.166.192/27	10.15.166.193 – 10.15.166.222	10.15.166.223
56	10.15.166.224/27	10.15.166.225 – 10.15.166.254	10.15.166.255
57	10.15.167.0/27	10.15.167.1 – 10.15.167.30	10.15.167.31
58	10.15.167.32/27	10.15.167.33 – 10.15.167.62	10.15.167.63
59	10.15.167.64/27	10.15.167.65 – 10.15.167.94	10.15.167.95
60	10.15.167.96/27	10.15.167.97 – 10.15.167.126	10.15.167.127
61	10.15.167.128/27	10.15.167.129 – 10.15.167.158	10.15.167.159
62	10.15.167.160/27	10.15.167.161 – 10.15.167.190	10.15.167.191
63	10.15.167.192/27	10.15.167.193 – 10.15.167.222	10.15.167.223
64	10.15.167.224/27	10.15.167.225 – 10.15.167.254	10.15.167.255
65	10.15.168.0/27	10.15.168.1 – 10.15.168.30	10.15.168.31
66	10.15.168.32/27	10.15.168.33 – 10.15.168.62	10.15.168.63
67	10.15.168.64/27	10.15.168.65 – 10.15.168.94	10.15.168.95
68	10.15.168.96/27	10.15.168.97 – 10.15.168.126	10.15.168.127
69	10.15.168.128/27	10.15.168.129 – 10.15.168.158	10.15.168.159
70	10.15.168.160/27	10.15.168.161 – 10.15.168.190	10.15.168.191
71	10.15.168.192/27	10.15.168.193 – 10.15.168.222	10.15.168.223
72	10.15.168.224/27	10.15.168.225 – 10.15.168.254	10.15.168.255
73	10.15.169.0/27	10.15.169.1 – 10.15.169.30	10.15.169.31
74	10.15.169.32/27	10.15.169.33 – 10.15.169.62	10.15.169.63
75	10.15.169.64/27	10.15.169.65 – 10.15.169.94	10.15.169.95
76	10.15.169.96/27	10.15.169.97 – 10.15.169.126	10.15.169.127
77	10.15.169.128/27	10.15.169.129 – 10.15.169.158	10.15.169.159
78	10.15.169.160/27	10.15.169.161 – 10.15.169.190	10.15.169.191
79	10.15.169.192/27	10.15.169.193 – 10.15.169.222	10.15.169.223
80	10.15.169.224/27	10.15.169.225 – 10.15.169.254	10.15.169.255
81	10.15.170.0/27	10.15.170.1 – 10.15.170.30	10.15.170.31
82	10.15.170.32/27	10.15.170.33 – 10.15.170.62	10.15.170.63
83	10.15.170.64/27	10.15.170.65 – 10.15.170.94	10.15.170.95
84	10.15.170.96/27	10.15.170.97 – 10.15.170.126	10.15.170.127
85	10.15.170.128/27	10.15.170.129 – 10.15.170.158	10.15.170.159
86	10.15.170.160/27	10.15.170.161 – 10.15.170.190	10.15.170.191
87	10.15.170.192/27	10.15.170.193 – 10.15.170.222	10.15.170.223
88	10.15.170.224/27	10.15.170.225 – 10.15.170.254	10.15.170.255
89	10.15.171.0/27	10.15.171.1 – 10.15.171.30	10.15.171.31
90	10.15.171.32/27	10.15.171.33 – 10.15.171.62	10.15.171.63
91	10.15.171.64/27	10.15.171.65 – 10.15.171.94	10.15.171.95
92	10.15.171.96/27	10.15.171.97 – 10.15.171.126	10.15.171.127
93	10.15.171.128/27	10.15.171.129 – 10.15.171.158	10.15.171.159
94	10.15.171.160/27	10.15.171.161 – 10.15.171.190	10.15.171.191
95	10.15.171.192/27	10.15.171.193 – 10.15.171.222	10.15.171.223
96	10.15.171.224/27	10.15.171.225 – 10.15.171.254	10.15.171.255
97	10.15.172.0/27	10.15.172.1 – 10.15.172.30	10.15.172.31
98	10.15.172.32/27	10.15.172.33 – 10.15.172.62	10.15.172.63
99	10.15.172.64/27	10.15.172.65 – 10.15.172.94	10.15.172.95
100	10.15.172.96/27	10.15.172.97 – 10.15.172.126	10.15.172.127
101	10.15.172.128/27	10.15.172.129 – 10.15.172.158	10.15.172.159
102	10.15.172.160/27	10.15.172.161 – 10.15.172.190	10.15.172.191
103	10.15.172.192/27	10.15.172.193 – 10.15.172.222	10.15.172.223
104	10.15.172.224/27	10.15.172.225 – 10.15.172.254	10.15.172.255
105	10.15.173.0/27	10.15.173.1 – 10.15.173.30	10.15.173.31
106	10.15.173.32/27	10.15.173.33 – 10.15.173.62	10.15.173.63
107	10.15.173.64/27	10.15.173.65 – 10.15.173.94	10.15.173.95
108	10.15.173.96/27	10.15.173.97 – 10.15.173.126	10.15.173.127
109	10.15.173.128/27	10.15.173.129 – 10.15.173.158	10.15.173.159
110	10.15.173.160/27	10.15.173.161 – 10.15.173.190	10.15.173.191
111	10.15.173.192/27	10.15.173.193 – 10.15.173.222	10.15.173.223
112	10.15.173.224/27	10.15.173.225 – 10.15.173.254	10.15.173.255
113	10.15.174.0/27	10.15.174.1 – 10.15.174.30	10.15.174.31
114	10.15.174.32/27	10.15.174.33 – 10.15.174.62	10.15.174.63
115	10.15.174.64/27	10.15.174.65 – 10.15.174.94	10.15.174.95
116	10.15.174.96/27	10.15.174.97 – 10.15.174.126	10.15.174.127
117	10.15.174.128/27	10.15.174.129 – 10.15.174.158	10.15.174.159
118	10.15.174.160/27	10.15.174.161 – 10.15.174.190	10.15.174.191
119	10.15.174.192/27	10.15.174.193 – 10.15.174.222	10.15.174.223
120	10.15.174.224/27	10.15.174.225 – 10.15.174.254	10.15.174.255
121	10.15.175.0/27	10.15.175.1 – 10.15.175.30	10.15.175.31
122	10.15.175.32/27	10.15.175.33 – 10.15.175.62	10.15.175.63
123	10.15.175.64/27	10.15.175.65 – 10.15.175.94	10.15.175.95
124	10.15.175.96/27	10.15.175.97 – 10.15.175.126	10.15.175.127
125	10.15.175.128/27	10.15.175.129 – 10.15.175.158	10.15.175.159
126	10.15.175.160/27	10.15.175.161 – 10.15.175.190	10.15.175.191
127	10.15.175.192/27	10.15.175.193 – 10.15.175.222	10.15.175.223
128	10.15.175.224/27	10.15.175.225 – 10.15.175.254	10.15.175.255

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 →