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)10.166.20.0/22

network10.166.20.0/22

broadcast10.166.23.255

first host10.166.20.1

last host10.166.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.166.20.0/22

address00001010.10100110.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.10100110.00010100.00000000

broadcast00001010.10100110.00010111.11111111

green = network part, grey = host part

hex0x0aa61400

decimal178656256

reverse dns0.20.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:1400

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.20.0/29	10.166.20.1 – 10.166.20.6	10.166.20.7
2	10.166.20.8/29	10.166.20.9 – 10.166.20.14	10.166.20.15
3	10.166.20.16/29	10.166.20.17 – 10.166.20.22	10.166.20.23
4	10.166.20.24/29	10.166.20.25 – 10.166.20.30	10.166.20.31
5	10.166.20.32/29	10.166.20.33 – 10.166.20.38	10.166.20.39
6	10.166.20.40/29	10.166.20.41 – 10.166.20.46	10.166.20.47
7	10.166.20.48/29	10.166.20.49 – 10.166.20.54	10.166.20.55
8	10.166.20.56/29	10.166.20.57 – 10.166.20.62	10.166.20.63
9	10.166.20.64/29	10.166.20.65 – 10.166.20.70	10.166.20.71
10	10.166.20.72/29	10.166.20.73 – 10.166.20.78	10.166.20.79
11	10.166.20.80/29	10.166.20.81 – 10.166.20.86	10.166.20.87
12	10.166.20.88/29	10.166.20.89 – 10.166.20.94	10.166.20.95
13	10.166.20.96/29	10.166.20.97 – 10.166.20.102	10.166.20.103
14	10.166.20.104/29	10.166.20.105 – 10.166.20.110	10.166.20.111
15	10.166.20.112/29	10.166.20.113 – 10.166.20.118	10.166.20.119
16	10.166.20.120/29	10.166.20.121 – 10.166.20.126	10.166.20.127
17	10.166.20.128/29	10.166.20.129 – 10.166.20.134	10.166.20.135
18	10.166.20.136/29	10.166.20.137 – 10.166.20.142	10.166.20.143
19	10.166.20.144/29	10.166.20.145 – 10.166.20.150	10.166.20.151
20	10.166.20.152/29	10.166.20.153 – 10.166.20.158	10.166.20.159
21	10.166.20.160/29	10.166.20.161 – 10.166.20.166	10.166.20.167
22	10.166.20.168/29	10.166.20.169 – 10.166.20.174	10.166.20.175
23	10.166.20.176/29	10.166.20.177 – 10.166.20.182	10.166.20.183
24	10.166.20.184/29	10.166.20.185 – 10.166.20.190	10.166.20.191
25	10.166.20.192/29	10.166.20.193 – 10.166.20.198	10.166.20.199
26	10.166.20.200/29	10.166.20.201 – 10.166.20.206	10.166.20.207
27	10.166.20.208/29	10.166.20.209 – 10.166.20.214	10.166.20.215
28	10.166.20.216/29	10.166.20.217 – 10.166.20.222	10.166.20.223
29	10.166.20.224/29	10.166.20.225 – 10.166.20.230	10.166.20.231
30	10.166.20.232/29	10.166.20.233 – 10.166.20.238	10.166.20.239
31	10.166.20.240/29	10.166.20.241 – 10.166.20.246	10.166.20.247
32	10.166.20.248/29	10.166.20.249 – 10.166.20.254	10.166.20.255
33	10.166.21.0/29	10.166.21.1 – 10.166.21.6	10.166.21.7
34	10.166.21.8/29	10.166.21.9 – 10.166.21.14	10.166.21.15
35	10.166.21.16/29	10.166.21.17 – 10.166.21.22	10.166.21.23
36	10.166.21.24/29	10.166.21.25 – 10.166.21.30	10.166.21.31
37	10.166.21.32/29	10.166.21.33 – 10.166.21.38	10.166.21.39
38	10.166.21.40/29	10.166.21.41 – 10.166.21.46	10.166.21.47
39	10.166.21.48/29	10.166.21.49 – 10.166.21.54	10.166.21.55
40	10.166.21.56/29	10.166.21.57 – 10.166.21.62	10.166.21.63
41	10.166.21.64/29	10.166.21.65 – 10.166.21.70	10.166.21.71
42	10.166.21.72/29	10.166.21.73 – 10.166.21.78	10.166.21.79
43	10.166.21.80/29	10.166.21.81 – 10.166.21.86	10.166.21.87
44	10.166.21.88/29	10.166.21.89 – 10.166.21.94	10.166.21.95
45	10.166.21.96/29	10.166.21.97 – 10.166.21.102	10.166.21.103
46	10.166.21.104/29	10.166.21.105 – 10.166.21.110	10.166.21.111
47	10.166.21.112/29	10.166.21.113 – 10.166.21.118	10.166.21.119
48	10.166.21.120/29	10.166.21.121 – 10.166.21.126	10.166.21.127
49	10.166.21.128/29	10.166.21.129 – 10.166.21.134	10.166.21.135
50	10.166.21.136/29	10.166.21.137 – 10.166.21.142	10.166.21.143
51	10.166.21.144/29	10.166.21.145 – 10.166.21.150	10.166.21.151
52	10.166.21.152/29	10.166.21.153 – 10.166.21.158	10.166.21.159
53	10.166.21.160/29	10.166.21.161 – 10.166.21.166	10.166.21.167
54	10.166.21.168/29	10.166.21.169 – 10.166.21.174	10.166.21.175
55	10.166.21.176/29	10.166.21.177 – 10.166.21.182	10.166.21.183
56	10.166.21.184/29	10.166.21.185 – 10.166.21.190	10.166.21.191
57	10.166.21.192/29	10.166.21.193 – 10.166.21.198	10.166.21.199
58	10.166.21.200/29	10.166.21.201 – 10.166.21.206	10.166.21.207
59	10.166.21.208/29	10.166.21.209 – 10.166.21.214	10.166.21.215
60	10.166.21.216/29	10.166.21.217 – 10.166.21.222	10.166.21.223
61	10.166.21.224/29	10.166.21.225 – 10.166.21.230	10.166.21.231
62	10.166.21.232/29	10.166.21.233 – 10.166.21.238	10.166.21.239
63	10.166.21.240/29	10.166.21.241 – 10.166.21.246	10.166.21.247
64	10.166.21.248/29	10.166.21.249 – 10.166.21.254	10.166.21.255
65	10.166.22.0/29	10.166.22.1 – 10.166.22.6	10.166.22.7
66	10.166.22.8/29	10.166.22.9 – 10.166.22.14	10.166.22.15
67	10.166.22.16/29	10.166.22.17 – 10.166.22.22	10.166.22.23
68	10.166.22.24/29	10.166.22.25 – 10.166.22.30	10.166.22.31
69	10.166.22.32/29	10.166.22.33 – 10.166.22.38	10.166.22.39
70	10.166.22.40/29	10.166.22.41 – 10.166.22.46	10.166.22.47
71	10.166.22.48/29	10.166.22.49 – 10.166.22.54	10.166.22.55
72	10.166.22.56/29	10.166.22.57 – 10.166.22.62	10.166.22.63
73	10.166.22.64/29	10.166.22.65 – 10.166.22.70	10.166.22.71
74	10.166.22.72/29	10.166.22.73 – 10.166.22.78	10.166.22.79
75	10.166.22.80/29	10.166.22.81 – 10.166.22.86	10.166.22.87
76	10.166.22.88/29	10.166.22.89 – 10.166.22.94	10.166.22.95
77	10.166.22.96/29	10.166.22.97 – 10.166.22.102	10.166.22.103
78	10.166.22.104/29	10.166.22.105 – 10.166.22.110	10.166.22.111
79	10.166.22.112/29	10.166.22.113 – 10.166.22.118	10.166.22.119
80	10.166.22.120/29	10.166.22.121 – 10.166.22.126	10.166.22.127
81	10.166.22.128/29	10.166.22.129 – 10.166.22.134	10.166.22.135
82	10.166.22.136/29	10.166.22.137 – 10.166.22.142	10.166.22.143
83	10.166.22.144/29	10.166.22.145 – 10.166.22.150	10.166.22.151
84	10.166.22.152/29	10.166.22.153 – 10.166.22.158	10.166.22.159
85	10.166.22.160/29	10.166.22.161 – 10.166.22.166	10.166.22.167
86	10.166.22.168/29	10.166.22.169 – 10.166.22.174	10.166.22.175
87	10.166.22.176/29	10.166.22.177 – 10.166.22.182	10.166.22.183
88	10.166.22.184/29	10.166.22.185 – 10.166.22.190	10.166.22.191
89	10.166.22.192/29	10.166.22.193 – 10.166.22.198	10.166.22.199
90	10.166.22.200/29	10.166.22.201 – 10.166.22.206	10.166.22.207
91	10.166.22.208/29	10.166.22.209 – 10.166.22.214	10.166.22.215
92	10.166.22.216/29	10.166.22.217 – 10.166.22.222	10.166.22.223
93	10.166.22.224/29	10.166.22.225 – 10.166.22.230	10.166.22.231
94	10.166.22.232/29	10.166.22.233 – 10.166.22.238	10.166.22.239
95	10.166.22.240/29	10.166.22.241 – 10.166.22.246	10.166.22.247
96	10.166.22.248/29	10.166.22.249 – 10.166.22.254	10.166.22.255
97	10.166.23.0/29	10.166.23.1 – 10.166.23.6	10.166.23.7
98	10.166.23.8/29	10.166.23.9 – 10.166.23.14	10.166.23.15
99	10.166.23.16/29	10.166.23.17 – 10.166.23.22	10.166.23.23
100	10.166.23.24/29	10.166.23.25 – 10.166.23.30	10.166.23.31
101	10.166.23.32/29	10.166.23.33 – 10.166.23.38	10.166.23.39
102	10.166.23.40/29	10.166.23.41 – 10.166.23.46	10.166.23.47
103	10.166.23.48/29	10.166.23.49 – 10.166.23.54	10.166.23.55
104	10.166.23.56/29	10.166.23.57 – 10.166.23.62	10.166.23.63
105	10.166.23.64/29	10.166.23.65 – 10.166.23.70	10.166.23.71
106	10.166.23.72/29	10.166.23.73 – 10.166.23.78	10.166.23.79
107	10.166.23.80/29	10.166.23.81 – 10.166.23.86	10.166.23.87
108	10.166.23.88/29	10.166.23.89 – 10.166.23.94	10.166.23.95
109	10.166.23.96/29	10.166.23.97 – 10.166.23.102	10.166.23.103
110	10.166.23.104/29	10.166.23.105 – 10.166.23.110	10.166.23.111
111	10.166.23.112/29	10.166.23.113 – 10.166.23.118	10.166.23.119
112	10.166.23.120/29	10.166.23.121 – 10.166.23.126	10.166.23.127
113	10.166.23.128/29	10.166.23.129 – 10.166.23.134	10.166.23.135
114	10.166.23.136/29	10.166.23.137 – 10.166.23.142	10.166.23.143
115	10.166.23.144/29	10.166.23.145 – 10.166.23.150	10.166.23.151
116	10.166.23.152/29	10.166.23.153 – 10.166.23.158	10.166.23.159
117	10.166.23.160/29	10.166.23.161 – 10.166.23.166	10.166.23.167
118	10.166.23.168/29	10.166.23.169 – 10.166.23.174	10.166.23.175
119	10.166.23.176/29	10.166.23.177 – 10.166.23.182	10.166.23.183
120	10.166.23.184/29	10.166.23.185 – 10.166.23.190	10.166.23.191
121	10.166.23.192/29	10.166.23.193 – 10.166.23.198	10.166.23.199
122	10.166.23.200/29	10.166.23.201 – 10.166.23.206	10.166.23.207
123	10.166.23.208/29	10.166.23.209 – 10.166.23.214	10.166.23.215
124	10.166.23.216/29	10.166.23.217 – 10.166.23.222	10.166.23.223
125	10.166.23.224/29	10.166.23.225 – 10.166.23.230	10.166.23.231
126	10.166.23.232/29	10.166.23.233 – 10.166.23.238	10.166.23.239
127	10.166.23.240/29	10.166.23.241 – 10.166.23.246	10.166.23.247
128	10.166.23.248/29	10.166.23.249 – 10.166.23.254	10.166.23.255

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 /22
/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	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	1
/23	255.255.254.0	512	510	2 split →
/24	255.255.255.0	256	254	4 split →
/25	255.255.255.128	128	126	8 split →
/26	255.255.255.192	64	62	16 split →
/27	255.255.255.224	32	30	32 split →
/28	255.255.255.240	16	14	64 split →
/29	255.255.255.248	8	6	128 split →
/30	255.255.255.252	4	2	256 split →
/31	255.255.255.254	2	2	512 split →
/32	255.255.255.255	1	1	1,024 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 →