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)10.166.96.0/20

network10.166.96.0/20

broadcast10.166.111.255

first host10.166.96.1

last host10.166.111.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.166.96.0/20

address00001010.10100110.01100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.10100110.01100000.00000000

broadcast00001010.10100110.01101111.11111111

green = network part, grey = host part

hex0x0aa66000

decimal178675712

reverse dns0.96.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:6000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.96.0/27	10.166.96.1 – 10.166.96.30	10.166.96.31
2	10.166.96.32/27	10.166.96.33 – 10.166.96.62	10.166.96.63
3	10.166.96.64/27	10.166.96.65 – 10.166.96.94	10.166.96.95
4	10.166.96.96/27	10.166.96.97 – 10.166.96.126	10.166.96.127
5	10.166.96.128/27	10.166.96.129 – 10.166.96.158	10.166.96.159
6	10.166.96.160/27	10.166.96.161 – 10.166.96.190	10.166.96.191
7	10.166.96.192/27	10.166.96.193 – 10.166.96.222	10.166.96.223
8	10.166.96.224/27	10.166.96.225 – 10.166.96.254	10.166.96.255
9	10.166.97.0/27	10.166.97.1 – 10.166.97.30	10.166.97.31
10	10.166.97.32/27	10.166.97.33 – 10.166.97.62	10.166.97.63
11	10.166.97.64/27	10.166.97.65 – 10.166.97.94	10.166.97.95
12	10.166.97.96/27	10.166.97.97 – 10.166.97.126	10.166.97.127
13	10.166.97.128/27	10.166.97.129 – 10.166.97.158	10.166.97.159
14	10.166.97.160/27	10.166.97.161 – 10.166.97.190	10.166.97.191
15	10.166.97.192/27	10.166.97.193 – 10.166.97.222	10.166.97.223
16	10.166.97.224/27	10.166.97.225 – 10.166.97.254	10.166.97.255
17	10.166.98.0/27	10.166.98.1 – 10.166.98.30	10.166.98.31
18	10.166.98.32/27	10.166.98.33 – 10.166.98.62	10.166.98.63
19	10.166.98.64/27	10.166.98.65 – 10.166.98.94	10.166.98.95
20	10.166.98.96/27	10.166.98.97 – 10.166.98.126	10.166.98.127
21	10.166.98.128/27	10.166.98.129 – 10.166.98.158	10.166.98.159
22	10.166.98.160/27	10.166.98.161 – 10.166.98.190	10.166.98.191
23	10.166.98.192/27	10.166.98.193 – 10.166.98.222	10.166.98.223
24	10.166.98.224/27	10.166.98.225 – 10.166.98.254	10.166.98.255
25	10.166.99.0/27	10.166.99.1 – 10.166.99.30	10.166.99.31
26	10.166.99.32/27	10.166.99.33 – 10.166.99.62	10.166.99.63
27	10.166.99.64/27	10.166.99.65 – 10.166.99.94	10.166.99.95
28	10.166.99.96/27	10.166.99.97 – 10.166.99.126	10.166.99.127
29	10.166.99.128/27	10.166.99.129 – 10.166.99.158	10.166.99.159
30	10.166.99.160/27	10.166.99.161 – 10.166.99.190	10.166.99.191
31	10.166.99.192/27	10.166.99.193 – 10.166.99.222	10.166.99.223
32	10.166.99.224/27	10.166.99.225 – 10.166.99.254	10.166.99.255
33	10.166.100.0/27	10.166.100.1 – 10.166.100.30	10.166.100.31
34	10.166.100.32/27	10.166.100.33 – 10.166.100.62	10.166.100.63
35	10.166.100.64/27	10.166.100.65 – 10.166.100.94	10.166.100.95
36	10.166.100.96/27	10.166.100.97 – 10.166.100.126	10.166.100.127
37	10.166.100.128/27	10.166.100.129 – 10.166.100.158	10.166.100.159
38	10.166.100.160/27	10.166.100.161 – 10.166.100.190	10.166.100.191
39	10.166.100.192/27	10.166.100.193 – 10.166.100.222	10.166.100.223
40	10.166.100.224/27	10.166.100.225 – 10.166.100.254	10.166.100.255
41	10.166.101.0/27	10.166.101.1 – 10.166.101.30	10.166.101.31
42	10.166.101.32/27	10.166.101.33 – 10.166.101.62	10.166.101.63
43	10.166.101.64/27	10.166.101.65 – 10.166.101.94	10.166.101.95
44	10.166.101.96/27	10.166.101.97 – 10.166.101.126	10.166.101.127
45	10.166.101.128/27	10.166.101.129 – 10.166.101.158	10.166.101.159
46	10.166.101.160/27	10.166.101.161 – 10.166.101.190	10.166.101.191
47	10.166.101.192/27	10.166.101.193 – 10.166.101.222	10.166.101.223
48	10.166.101.224/27	10.166.101.225 – 10.166.101.254	10.166.101.255
49	10.166.102.0/27	10.166.102.1 – 10.166.102.30	10.166.102.31
50	10.166.102.32/27	10.166.102.33 – 10.166.102.62	10.166.102.63
51	10.166.102.64/27	10.166.102.65 – 10.166.102.94	10.166.102.95
52	10.166.102.96/27	10.166.102.97 – 10.166.102.126	10.166.102.127
53	10.166.102.128/27	10.166.102.129 – 10.166.102.158	10.166.102.159
54	10.166.102.160/27	10.166.102.161 – 10.166.102.190	10.166.102.191
55	10.166.102.192/27	10.166.102.193 – 10.166.102.222	10.166.102.223
56	10.166.102.224/27	10.166.102.225 – 10.166.102.254	10.166.102.255
57	10.166.103.0/27	10.166.103.1 – 10.166.103.30	10.166.103.31
58	10.166.103.32/27	10.166.103.33 – 10.166.103.62	10.166.103.63
59	10.166.103.64/27	10.166.103.65 – 10.166.103.94	10.166.103.95
60	10.166.103.96/27	10.166.103.97 – 10.166.103.126	10.166.103.127
61	10.166.103.128/27	10.166.103.129 – 10.166.103.158	10.166.103.159
62	10.166.103.160/27	10.166.103.161 – 10.166.103.190	10.166.103.191
63	10.166.103.192/27	10.166.103.193 – 10.166.103.222	10.166.103.223
64	10.166.103.224/27	10.166.103.225 – 10.166.103.254	10.166.103.255
65	10.166.104.0/27	10.166.104.1 – 10.166.104.30	10.166.104.31
66	10.166.104.32/27	10.166.104.33 – 10.166.104.62	10.166.104.63
67	10.166.104.64/27	10.166.104.65 – 10.166.104.94	10.166.104.95
68	10.166.104.96/27	10.166.104.97 – 10.166.104.126	10.166.104.127
69	10.166.104.128/27	10.166.104.129 – 10.166.104.158	10.166.104.159
70	10.166.104.160/27	10.166.104.161 – 10.166.104.190	10.166.104.191
71	10.166.104.192/27	10.166.104.193 – 10.166.104.222	10.166.104.223
72	10.166.104.224/27	10.166.104.225 – 10.166.104.254	10.166.104.255
73	10.166.105.0/27	10.166.105.1 – 10.166.105.30	10.166.105.31
74	10.166.105.32/27	10.166.105.33 – 10.166.105.62	10.166.105.63
75	10.166.105.64/27	10.166.105.65 – 10.166.105.94	10.166.105.95
76	10.166.105.96/27	10.166.105.97 – 10.166.105.126	10.166.105.127
77	10.166.105.128/27	10.166.105.129 – 10.166.105.158	10.166.105.159
78	10.166.105.160/27	10.166.105.161 – 10.166.105.190	10.166.105.191
79	10.166.105.192/27	10.166.105.193 – 10.166.105.222	10.166.105.223
80	10.166.105.224/27	10.166.105.225 – 10.166.105.254	10.166.105.255
81	10.166.106.0/27	10.166.106.1 – 10.166.106.30	10.166.106.31
82	10.166.106.32/27	10.166.106.33 – 10.166.106.62	10.166.106.63
83	10.166.106.64/27	10.166.106.65 – 10.166.106.94	10.166.106.95
84	10.166.106.96/27	10.166.106.97 – 10.166.106.126	10.166.106.127
85	10.166.106.128/27	10.166.106.129 – 10.166.106.158	10.166.106.159
86	10.166.106.160/27	10.166.106.161 – 10.166.106.190	10.166.106.191
87	10.166.106.192/27	10.166.106.193 – 10.166.106.222	10.166.106.223
88	10.166.106.224/27	10.166.106.225 – 10.166.106.254	10.166.106.255
89	10.166.107.0/27	10.166.107.1 – 10.166.107.30	10.166.107.31
90	10.166.107.32/27	10.166.107.33 – 10.166.107.62	10.166.107.63
91	10.166.107.64/27	10.166.107.65 – 10.166.107.94	10.166.107.95
92	10.166.107.96/27	10.166.107.97 – 10.166.107.126	10.166.107.127
93	10.166.107.128/27	10.166.107.129 – 10.166.107.158	10.166.107.159
94	10.166.107.160/27	10.166.107.161 – 10.166.107.190	10.166.107.191
95	10.166.107.192/27	10.166.107.193 – 10.166.107.222	10.166.107.223
96	10.166.107.224/27	10.166.107.225 – 10.166.107.254	10.166.107.255
97	10.166.108.0/27	10.166.108.1 – 10.166.108.30	10.166.108.31
98	10.166.108.32/27	10.166.108.33 – 10.166.108.62	10.166.108.63
99	10.166.108.64/27	10.166.108.65 – 10.166.108.94	10.166.108.95
100	10.166.108.96/27	10.166.108.97 – 10.166.108.126	10.166.108.127
101	10.166.108.128/27	10.166.108.129 – 10.166.108.158	10.166.108.159
102	10.166.108.160/27	10.166.108.161 – 10.166.108.190	10.166.108.191
103	10.166.108.192/27	10.166.108.193 – 10.166.108.222	10.166.108.223
104	10.166.108.224/27	10.166.108.225 – 10.166.108.254	10.166.108.255
105	10.166.109.0/27	10.166.109.1 – 10.166.109.30	10.166.109.31
106	10.166.109.32/27	10.166.109.33 – 10.166.109.62	10.166.109.63
107	10.166.109.64/27	10.166.109.65 – 10.166.109.94	10.166.109.95
108	10.166.109.96/27	10.166.109.97 – 10.166.109.126	10.166.109.127
109	10.166.109.128/27	10.166.109.129 – 10.166.109.158	10.166.109.159
110	10.166.109.160/27	10.166.109.161 – 10.166.109.190	10.166.109.191
111	10.166.109.192/27	10.166.109.193 – 10.166.109.222	10.166.109.223
112	10.166.109.224/27	10.166.109.225 – 10.166.109.254	10.166.109.255
113	10.166.110.0/27	10.166.110.1 – 10.166.110.30	10.166.110.31
114	10.166.110.32/27	10.166.110.33 – 10.166.110.62	10.166.110.63
115	10.166.110.64/27	10.166.110.65 – 10.166.110.94	10.166.110.95
116	10.166.110.96/27	10.166.110.97 – 10.166.110.126	10.166.110.127
117	10.166.110.128/27	10.166.110.129 – 10.166.110.158	10.166.110.159
118	10.166.110.160/27	10.166.110.161 – 10.166.110.190	10.166.110.191
119	10.166.110.192/27	10.166.110.193 – 10.166.110.222	10.166.110.223
120	10.166.110.224/27	10.166.110.225 – 10.166.110.254	10.166.110.255
121	10.166.111.0/27	10.166.111.1 – 10.166.111.30	10.166.111.31
122	10.166.111.32/27	10.166.111.33 – 10.166.111.62	10.166.111.63
123	10.166.111.64/27	10.166.111.65 – 10.166.111.94	10.166.111.95
124	10.166.111.96/27	10.166.111.97 – 10.166.111.126	10.166.111.127
125	10.166.111.128/27	10.166.111.129 – 10.166.111.158	10.166.111.159
126	10.166.111.160/27	10.166.111.161 – 10.166.111.190	10.166.111.191
127	10.166.111.192/27	10.166.111.193 – 10.166.111.222	10.166.111.223
128	10.166.111.224/27	10.166.111.225 – 10.166.111.254	10.166.111.255

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 →