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)10.166.32.0/20

network10.166.32.0/20

broadcast10.166.47.255

first host10.166.32.1

last host10.166.47.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.166.32.0/20

address00001010.10100110.00100000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.10100110.00100000.00000000

broadcast00001010.10100110.00101111.11111111

green = network part, grey = host part

hex0x0aa62000

decimal178659328

reverse dns0.32.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:2000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.32.0/27	10.166.32.1 – 10.166.32.30	10.166.32.31
2	10.166.32.32/27	10.166.32.33 – 10.166.32.62	10.166.32.63
3	10.166.32.64/27	10.166.32.65 – 10.166.32.94	10.166.32.95
4	10.166.32.96/27	10.166.32.97 – 10.166.32.126	10.166.32.127
5	10.166.32.128/27	10.166.32.129 – 10.166.32.158	10.166.32.159
6	10.166.32.160/27	10.166.32.161 – 10.166.32.190	10.166.32.191
7	10.166.32.192/27	10.166.32.193 – 10.166.32.222	10.166.32.223
8	10.166.32.224/27	10.166.32.225 – 10.166.32.254	10.166.32.255
9	10.166.33.0/27	10.166.33.1 – 10.166.33.30	10.166.33.31
10	10.166.33.32/27	10.166.33.33 – 10.166.33.62	10.166.33.63
11	10.166.33.64/27	10.166.33.65 – 10.166.33.94	10.166.33.95
12	10.166.33.96/27	10.166.33.97 – 10.166.33.126	10.166.33.127
13	10.166.33.128/27	10.166.33.129 – 10.166.33.158	10.166.33.159
14	10.166.33.160/27	10.166.33.161 – 10.166.33.190	10.166.33.191
15	10.166.33.192/27	10.166.33.193 – 10.166.33.222	10.166.33.223
16	10.166.33.224/27	10.166.33.225 – 10.166.33.254	10.166.33.255
17	10.166.34.0/27	10.166.34.1 – 10.166.34.30	10.166.34.31
18	10.166.34.32/27	10.166.34.33 – 10.166.34.62	10.166.34.63
19	10.166.34.64/27	10.166.34.65 – 10.166.34.94	10.166.34.95
20	10.166.34.96/27	10.166.34.97 – 10.166.34.126	10.166.34.127
21	10.166.34.128/27	10.166.34.129 – 10.166.34.158	10.166.34.159
22	10.166.34.160/27	10.166.34.161 – 10.166.34.190	10.166.34.191
23	10.166.34.192/27	10.166.34.193 – 10.166.34.222	10.166.34.223
24	10.166.34.224/27	10.166.34.225 – 10.166.34.254	10.166.34.255
25	10.166.35.0/27	10.166.35.1 – 10.166.35.30	10.166.35.31
26	10.166.35.32/27	10.166.35.33 – 10.166.35.62	10.166.35.63
27	10.166.35.64/27	10.166.35.65 – 10.166.35.94	10.166.35.95
28	10.166.35.96/27	10.166.35.97 – 10.166.35.126	10.166.35.127
29	10.166.35.128/27	10.166.35.129 – 10.166.35.158	10.166.35.159
30	10.166.35.160/27	10.166.35.161 – 10.166.35.190	10.166.35.191
31	10.166.35.192/27	10.166.35.193 – 10.166.35.222	10.166.35.223
32	10.166.35.224/27	10.166.35.225 – 10.166.35.254	10.166.35.255
33	10.166.36.0/27	10.166.36.1 – 10.166.36.30	10.166.36.31
34	10.166.36.32/27	10.166.36.33 – 10.166.36.62	10.166.36.63
35	10.166.36.64/27	10.166.36.65 – 10.166.36.94	10.166.36.95
36	10.166.36.96/27	10.166.36.97 – 10.166.36.126	10.166.36.127
37	10.166.36.128/27	10.166.36.129 – 10.166.36.158	10.166.36.159
38	10.166.36.160/27	10.166.36.161 – 10.166.36.190	10.166.36.191
39	10.166.36.192/27	10.166.36.193 – 10.166.36.222	10.166.36.223
40	10.166.36.224/27	10.166.36.225 – 10.166.36.254	10.166.36.255
41	10.166.37.0/27	10.166.37.1 – 10.166.37.30	10.166.37.31
42	10.166.37.32/27	10.166.37.33 – 10.166.37.62	10.166.37.63
43	10.166.37.64/27	10.166.37.65 – 10.166.37.94	10.166.37.95
44	10.166.37.96/27	10.166.37.97 – 10.166.37.126	10.166.37.127
45	10.166.37.128/27	10.166.37.129 – 10.166.37.158	10.166.37.159
46	10.166.37.160/27	10.166.37.161 – 10.166.37.190	10.166.37.191
47	10.166.37.192/27	10.166.37.193 – 10.166.37.222	10.166.37.223
48	10.166.37.224/27	10.166.37.225 – 10.166.37.254	10.166.37.255
49	10.166.38.0/27	10.166.38.1 – 10.166.38.30	10.166.38.31
50	10.166.38.32/27	10.166.38.33 – 10.166.38.62	10.166.38.63
51	10.166.38.64/27	10.166.38.65 – 10.166.38.94	10.166.38.95
52	10.166.38.96/27	10.166.38.97 – 10.166.38.126	10.166.38.127
53	10.166.38.128/27	10.166.38.129 – 10.166.38.158	10.166.38.159
54	10.166.38.160/27	10.166.38.161 – 10.166.38.190	10.166.38.191
55	10.166.38.192/27	10.166.38.193 – 10.166.38.222	10.166.38.223
56	10.166.38.224/27	10.166.38.225 – 10.166.38.254	10.166.38.255
57	10.166.39.0/27	10.166.39.1 – 10.166.39.30	10.166.39.31
58	10.166.39.32/27	10.166.39.33 – 10.166.39.62	10.166.39.63
59	10.166.39.64/27	10.166.39.65 – 10.166.39.94	10.166.39.95
60	10.166.39.96/27	10.166.39.97 – 10.166.39.126	10.166.39.127
61	10.166.39.128/27	10.166.39.129 – 10.166.39.158	10.166.39.159
62	10.166.39.160/27	10.166.39.161 – 10.166.39.190	10.166.39.191
63	10.166.39.192/27	10.166.39.193 – 10.166.39.222	10.166.39.223
64	10.166.39.224/27	10.166.39.225 – 10.166.39.254	10.166.39.255
65	10.166.40.0/27	10.166.40.1 – 10.166.40.30	10.166.40.31
66	10.166.40.32/27	10.166.40.33 – 10.166.40.62	10.166.40.63
67	10.166.40.64/27	10.166.40.65 – 10.166.40.94	10.166.40.95
68	10.166.40.96/27	10.166.40.97 – 10.166.40.126	10.166.40.127
69	10.166.40.128/27	10.166.40.129 – 10.166.40.158	10.166.40.159
70	10.166.40.160/27	10.166.40.161 – 10.166.40.190	10.166.40.191
71	10.166.40.192/27	10.166.40.193 – 10.166.40.222	10.166.40.223
72	10.166.40.224/27	10.166.40.225 – 10.166.40.254	10.166.40.255
73	10.166.41.0/27	10.166.41.1 – 10.166.41.30	10.166.41.31
74	10.166.41.32/27	10.166.41.33 – 10.166.41.62	10.166.41.63
75	10.166.41.64/27	10.166.41.65 – 10.166.41.94	10.166.41.95
76	10.166.41.96/27	10.166.41.97 – 10.166.41.126	10.166.41.127
77	10.166.41.128/27	10.166.41.129 – 10.166.41.158	10.166.41.159
78	10.166.41.160/27	10.166.41.161 – 10.166.41.190	10.166.41.191
79	10.166.41.192/27	10.166.41.193 – 10.166.41.222	10.166.41.223
80	10.166.41.224/27	10.166.41.225 – 10.166.41.254	10.166.41.255
81	10.166.42.0/27	10.166.42.1 – 10.166.42.30	10.166.42.31
82	10.166.42.32/27	10.166.42.33 – 10.166.42.62	10.166.42.63
83	10.166.42.64/27	10.166.42.65 – 10.166.42.94	10.166.42.95
84	10.166.42.96/27	10.166.42.97 – 10.166.42.126	10.166.42.127
85	10.166.42.128/27	10.166.42.129 – 10.166.42.158	10.166.42.159
86	10.166.42.160/27	10.166.42.161 – 10.166.42.190	10.166.42.191
87	10.166.42.192/27	10.166.42.193 – 10.166.42.222	10.166.42.223
88	10.166.42.224/27	10.166.42.225 – 10.166.42.254	10.166.42.255
89	10.166.43.0/27	10.166.43.1 – 10.166.43.30	10.166.43.31
90	10.166.43.32/27	10.166.43.33 – 10.166.43.62	10.166.43.63
91	10.166.43.64/27	10.166.43.65 – 10.166.43.94	10.166.43.95
92	10.166.43.96/27	10.166.43.97 – 10.166.43.126	10.166.43.127
93	10.166.43.128/27	10.166.43.129 – 10.166.43.158	10.166.43.159
94	10.166.43.160/27	10.166.43.161 – 10.166.43.190	10.166.43.191
95	10.166.43.192/27	10.166.43.193 – 10.166.43.222	10.166.43.223
96	10.166.43.224/27	10.166.43.225 – 10.166.43.254	10.166.43.255
97	10.166.44.0/27	10.166.44.1 – 10.166.44.30	10.166.44.31
98	10.166.44.32/27	10.166.44.33 – 10.166.44.62	10.166.44.63
99	10.166.44.64/27	10.166.44.65 – 10.166.44.94	10.166.44.95
100	10.166.44.96/27	10.166.44.97 – 10.166.44.126	10.166.44.127
101	10.166.44.128/27	10.166.44.129 – 10.166.44.158	10.166.44.159
102	10.166.44.160/27	10.166.44.161 – 10.166.44.190	10.166.44.191
103	10.166.44.192/27	10.166.44.193 – 10.166.44.222	10.166.44.223
104	10.166.44.224/27	10.166.44.225 – 10.166.44.254	10.166.44.255
105	10.166.45.0/27	10.166.45.1 – 10.166.45.30	10.166.45.31
106	10.166.45.32/27	10.166.45.33 – 10.166.45.62	10.166.45.63
107	10.166.45.64/27	10.166.45.65 – 10.166.45.94	10.166.45.95
108	10.166.45.96/27	10.166.45.97 – 10.166.45.126	10.166.45.127
109	10.166.45.128/27	10.166.45.129 – 10.166.45.158	10.166.45.159
110	10.166.45.160/27	10.166.45.161 – 10.166.45.190	10.166.45.191
111	10.166.45.192/27	10.166.45.193 – 10.166.45.222	10.166.45.223
112	10.166.45.224/27	10.166.45.225 – 10.166.45.254	10.166.45.255
113	10.166.46.0/27	10.166.46.1 – 10.166.46.30	10.166.46.31
114	10.166.46.32/27	10.166.46.33 – 10.166.46.62	10.166.46.63
115	10.166.46.64/27	10.166.46.65 – 10.166.46.94	10.166.46.95
116	10.166.46.96/27	10.166.46.97 – 10.166.46.126	10.166.46.127
117	10.166.46.128/27	10.166.46.129 – 10.166.46.158	10.166.46.159
118	10.166.46.160/27	10.166.46.161 – 10.166.46.190	10.166.46.191
119	10.166.46.192/27	10.166.46.193 – 10.166.46.222	10.166.46.223
120	10.166.46.224/27	10.166.46.225 – 10.166.46.254	10.166.46.255
121	10.166.47.0/27	10.166.47.1 – 10.166.47.30	10.166.47.31
122	10.166.47.32/27	10.166.47.33 – 10.166.47.62	10.166.47.63
123	10.166.47.64/27	10.166.47.65 – 10.166.47.94	10.166.47.95
124	10.166.47.96/27	10.166.47.97 – 10.166.47.126	10.166.47.127
125	10.166.47.128/27	10.166.47.129 – 10.166.47.158	10.166.47.159
126	10.166.47.160/27	10.166.47.161 – 10.166.47.190	10.166.47.191
127	10.166.47.192/27	10.166.47.193 – 10.166.47.222	10.166.47.223
128	10.166.47.224/27	10.166.47.225 – 10.166.47.254	10.166.47.255

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 →