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)10.166.16.0/22

network10.166.16.0/22

broadcast10.166.19.255

first host10.166.16.1

last host10.166.19.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.166.16.0/22

address00001010.10100110.00010000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.10100110.00010000.00000000

broadcast00001010.10100110.00010011.11111111

green = network part, grey = host part

hex0x0aa61000

decimal178655232

reverse dns0.16.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:1000

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.16.0/29	10.166.16.1 – 10.166.16.6	10.166.16.7
2	10.166.16.8/29	10.166.16.9 – 10.166.16.14	10.166.16.15
3	10.166.16.16/29	10.166.16.17 – 10.166.16.22	10.166.16.23
4	10.166.16.24/29	10.166.16.25 – 10.166.16.30	10.166.16.31
5	10.166.16.32/29	10.166.16.33 – 10.166.16.38	10.166.16.39
6	10.166.16.40/29	10.166.16.41 – 10.166.16.46	10.166.16.47
7	10.166.16.48/29	10.166.16.49 – 10.166.16.54	10.166.16.55
8	10.166.16.56/29	10.166.16.57 – 10.166.16.62	10.166.16.63
9	10.166.16.64/29	10.166.16.65 – 10.166.16.70	10.166.16.71
10	10.166.16.72/29	10.166.16.73 – 10.166.16.78	10.166.16.79
11	10.166.16.80/29	10.166.16.81 – 10.166.16.86	10.166.16.87
12	10.166.16.88/29	10.166.16.89 – 10.166.16.94	10.166.16.95
13	10.166.16.96/29	10.166.16.97 – 10.166.16.102	10.166.16.103
14	10.166.16.104/29	10.166.16.105 – 10.166.16.110	10.166.16.111
15	10.166.16.112/29	10.166.16.113 – 10.166.16.118	10.166.16.119
16	10.166.16.120/29	10.166.16.121 – 10.166.16.126	10.166.16.127
17	10.166.16.128/29	10.166.16.129 – 10.166.16.134	10.166.16.135
18	10.166.16.136/29	10.166.16.137 – 10.166.16.142	10.166.16.143
19	10.166.16.144/29	10.166.16.145 – 10.166.16.150	10.166.16.151
20	10.166.16.152/29	10.166.16.153 – 10.166.16.158	10.166.16.159
21	10.166.16.160/29	10.166.16.161 – 10.166.16.166	10.166.16.167
22	10.166.16.168/29	10.166.16.169 – 10.166.16.174	10.166.16.175
23	10.166.16.176/29	10.166.16.177 – 10.166.16.182	10.166.16.183
24	10.166.16.184/29	10.166.16.185 – 10.166.16.190	10.166.16.191
25	10.166.16.192/29	10.166.16.193 – 10.166.16.198	10.166.16.199
26	10.166.16.200/29	10.166.16.201 – 10.166.16.206	10.166.16.207
27	10.166.16.208/29	10.166.16.209 – 10.166.16.214	10.166.16.215
28	10.166.16.216/29	10.166.16.217 – 10.166.16.222	10.166.16.223
29	10.166.16.224/29	10.166.16.225 – 10.166.16.230	10.166.16.231
30	10.166.16.232/29	10.166.16.233 – 10.166.16.238	10.166.16.239
31	10.166.16.240/29	10.166.16.241 – 10.166.16.246	10.166.16.247
32	10.166.16.248/29	10.166.16.249 – 10.166.16.254	10.166.16.255
33	10.166.17.0/29	10.166.17.1 – 10.166.17.6	10.166.17.7
34	10.166.17.8/29	10.166.17.9 – 10.166.17.14	10.166.17.15
35	10.166.17.16/29	10.166.17.17 – 10.166.17.22	10.166.17.23
36	10.166.17.24/29	10.166.17.25 – 10.166.17.30	10.166.17.31
37	10.166.17.32/29	10.166.17.33 – 10.166.17.38	10.166.17.39
38	10.166.17.40/29	10.166.17.41 – 10.166.17.46	10.166.17.47
39	10.166.17.48/29	10.166.17.49 – 10.166.17.54	10.166.17.55
40	10.166.17.56/29	10.166.17.57 – 10.166.17.62	10.166.17.63
41	10.166.17.64/29	10.166.17.65 – 10.166.17.70	10.166.17.71
42	10.166.17.72/29	10.166.17.73 – 10.166.17.78	10.166.17.79
43	10.166.17.80/29	10.166.17.81 – 10.166.17.86	10.166.17.87
44	10.166.17.88/29	10.166.17.89 – 10.166.17.94	10.166.17.95
45	10.166.17.96/29	10.166.17.97 – 10.166.17.102	10.166.17.103
46	10.166.17.104/29	10.166.17.105 – 10.166.17.110	10.166.17.111
47	10.166.17.112/29	10.166.17.113 – 10.166.17.118	10.166.17.119
48	10.166.17.120/29	10.166.17.121 – 10.166.17.126	10.166.17.127
49	10.166.17.128/29	10.166.17.129 – 10.166.17.134	10.166.17.135
50	10.166.17.136/29	10.166.17.137 – 10.166.17.142	10.166.17.143
51	10.166.17.144/29	10.166.17.145 – 10.166.17.150	10.166.17.151
52	10.166.17.152/29	10.166.17.153 – 10.166.17.158	10.166.17.159
53	10.166.17.160/29	10.166.17.161 – 10.166.17.166	10.166.17.167
54	10.166.17.168/29	10.166.17.169 – 10.166.17.174	10.166.17.175
55	10.166.17.176/29	10.166.17.177 – 10.166.17.182	10.166.17.183
56	10.166.17.184/29	10.166.17.185 – 10.166.17.190	10.166.17.191
57	10.166.17.192/29	10.166.17.193 – 10.166.17.198	10.166.17.199
58	10.166.17.200/29	10.166.17.201 – 10.166.17.206	10.166.17.207
59	10.166.17.208/29	10.166.17.209 – 10.166.17.214	10.166.17.215
60	10.166.17.216/29	10.166.17.217 – 10.166.17.222	10.166.17.223
61	10.166.17.224/29	10.166.17.225 – 10.166.17.230	10.166.17.231
62	10.166.17.232/29	10.166.17.233 – 10.166.17.238	10.166.17.239
63	10.166.17.240/29	10.166.17.241 – 10.166.17.246	10.166.17.247
64	10.166.17.248/29	10.166.17.249 – 10.166.17.254	10.166.17.255
65	10.166.18.0/29	10.166.18.1 – 10.166.18.6	10.166.18.7
66	10.166.18.8/29	10.166.18.9 – 10.166.18.14	10.166.18.15
67	10.166.18.16/29	10.166.18.17 – 10.166.18.22	10.166.18.23
68	10.166.18.24/29	10.166.18.25 – 10.166.18.30	10.166.18.31
69	10.166.18.32/29	10.166.18.33 – 10.166.18.38	10.166.18.39
70	10.166.18.40/29	10.166.18.41 – 10.166.18.46	10.166.18.47
71	10.166.18.48/29	10.166.18.49 – 10.166.18.54	10.166.18.55
72	10.166.18.56/29	10.166.18.57 – 10.166.18.62	10.166.18.63
73	10.166.18.64/29	10.166.18.65 – 10.166.18.70	10.166.18.71
74	10.166.18.72/29	10.166.18.73 – 10.166.18.78	10.166.18.79
75	10.166.18.80/29	10.166.18.81 – 10.166.18.86	10.166.18.87
76	10.166.18.88/29	10.166.18.89 – 10.166.18.94	10.166.18.95
77	10.166.18.96/29	10.166.18.97 – 10.166.18.102	10.166.18.103
78	10.166.18.104/29	10.166.18.105 – 10.166.18.110	10.166.18.111
79	10.166.18.112/29	10.166.18.113 – 10.166.18.118	10.166.18.119
80	10.166.18.120/29	10.166.18.121 – 10.166.18.126	10.166.18.127
81	10.166.18.128/29	10.166.18.129 – 10.166.18.134	10.166.18.135
82	10.166.18.136/29	10.166.18.137 – 10.166.18.142	10.166.18.143
83	10.166.18.144/29	10.166.18.145 – 10.166.18.150	10.166.18.151
84	10.166.18.152/29	10.166.18.153 – 10.166.18.158	10.166.18.159
85	10.166.18.160/29	10.166.18.161 – 10.166.18.166	10.166.18.167
86	10.166.18.168/29	10.166.18.169 – 10.166.18.174	10.166.18.175
87	10.166.18.176/29	10.166.18.177 – 10.166.18.182	10.166.18.183
88	10.166.18.184/29	10.166.18.185 – 10.166.18.190	10.166.18.191
89	10.166.18.192/29	10.166.18.193 – 10.166.18.198	10.166.18.199
90	10.166.18.200/29	10.166.18.201 – 10.166.18.206	10.166.18.207
91	10.166.18.208/29	10.166.18.209 – 10.166.18.214	10.166.18.215
92	10.166.18.216/29	10.166.18.217 – 10.166.18.222	10.166.18.223
93	10.166.18.224/29	10.166.18.225 – 10.166.18.230	10.166.18.231
94	10.166.18.232/29	10.166.18.233 – 10.166.18.238	10.166.18.239
95	10.166.18.240/29	10.166.18.241 – 10.166.18.246	10.166.18.247
96	10.166.18.248/29	10.166.18.249 – 10.166.18.254	10.166.18.255
97	10.166.19.0/29	10.166.19.1 – 10.166.19.6	10.166.19.7
98	10.166.19.8/29	10.166.19.9 – 10.166.19.14	10.166.19.15
99	10.166.19.16/29	10.166.19.17 – 10.166.19.22	10.166.19.23
100	10.166.19.24/29	10.166.19.25 – 10.166.19.30	10.166.19.31
101	10.166.19.32/29	10.166.19.33 – 10.166.19.38	10.166.19.39
102	10.166.19.40/29	10.166.19.41 – 10.166.19.46	10.166.19.47
103	10.166.19.48/29	10.166.19.49 – 10.166.19.54	10.166.19.55
104	10.166.19.56/29	10.166.19.57 – 10.166.19.62	10.166.19.63
105	10.166.19.64/29	10.166.19.65 – 10.166.19.70	10.166.19.71
106	10.166.19.72/29	10.166.19.73 – 10.166.19.78	10.166.19.79
107	10.166.19.80/29	10.166.19.81 – 10.166.19.86	10.166.19.87
108	10.166.19.88/29	10.166.19.89 – 10.166.19.94	10.166.19.95
109	10.166.19.96/29	10.166.19.97 – 10.166.19.102	10.166.19.103
110	10.166.19.104/29	10.166.19.105 – 10.166.19.110	10.166.19.111
111	10.166.19.112/29	10.166.19.113 – 10.166.19.118	10.166.19.119
112	10.166.19.120/29	10.166.19.121 – 10.166.19.126	10.166.19.127
113	10.166.19.128/29	10.166.19.129 – 10.166.19.134	10.166.19.135
114	10.166.19.136/29	10.166.19.137 – 10.166.19.142	10.166.19.143
115	10.166.19.144/29	10.166.19.145 – 10.166.19.150	10.166.19.151
116	10.166.19.152/29	10.166.19.153 – 10.166.19.158	10.166.19.159
117	10.166.19.160/29	10.166.19.161 – 10.166.19.166	10.166.19.167
118	10.166.19.168/29	10.166.19.169 – 10.166.19.174	10.166.19.175
119	10.166.19.176/29	10.166.19.177 – 10.166.19.182	10.166.19.183
120	10.166.19.184/29	10.166.19.185 – 10.166.19.190	10.166.19.191
121	10.166.19.192/29	10.166.19.193 – 10.166.19.198	10.166.19.199
122	10.166.19.200/29	10.166.19.201 – 10.166.19.206	10.166.19.207
123	10.166.19.208/29	10.166.19.209 – 10.166.19.214	10.166.19.215
124	10.166.19.216/29	10.166.19.217 – 10.166.19.222	10.166.19.223
125	10.166.19.224/29	10.166.19.225 – 10.166.19.230	10.166.19.231
126	10.166.19.232/29	10.166.19.233 – 10.166.19.238	10.166.19.239
127	10.166.19.240/29	10.166.19.241 – 10.166.19.246	10.166.19.247
128	10.166.19.248/29	10.166.19.249 – 10.166.19.254	10.166.19.255

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 →