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)10.8.40.0/22

network10.8.40.0/22

broadcast10.8.43.255

first host10.8.40.1

last host10.8.43.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.8.40.0/22

address00001010.00001000.00101000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00001000.00101000.00000000

broadcast00001010.00001000.00101011.11111111

green = network part, grey = host part

hex0x0a082800

decimal168306688

reverse dns0.40.8.10.in-addr.arpa

ipv4-mapped::ffff:a08:2800

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.8.40.0/29	10.8.40.1 – 10.8.40.6	10.8.40.7
2	10.8.40.8/29	10.8.40.9 – 10.8.40.14	10.8.40.15
3	10.8.40.16/29	10.8.40.17 – 10.8.40.22	10.8.40.23
4	10.8.40.24/29	10.8.40.25 – 10.8.40.30	10.8.40.31
5	10.8.40.32/29	10.8.40.33 – 10.8.40.38	10.8.40.39
6	10.8.40.40/29	10.8.40.41 – 10.8.40.46	10.8.40.47
7	10.8.40.48/29	10.8.40.49 – 10.8.40.54	10.8.40.55
8	10.8.40.56/29	10.8.40.57 – 10.8.40.62	10.8.40.63
9	10.8.40.64/29	10.8.40.65 – 10.8.40.70	10.8.40.71
10	10.8.40.72/29	10.8.40.73 – 10.8.40.78	10.8.40.79
11	10.8.40.80/29	10.8.40.81 – 10.8.40.86	10.8.40.87
12	10.8.40.88/29	10.8.40.89 – 10.8.40.94	10.8.40.95
13	10.8.40.96/29	10.8.40.97 – 10.8.40.102	10.8.40.103
14	10.8.40.104/29	10.8.40.105 – 10.8.40.110	10.8.40.111
15	10.8.40.112/29	10.8.40.113 – 10.8.40.118	10.8.40.119
16	10.8.40.120/29	10.8.40.121 – 10.8.40.126	10.8.40.127
17	10.8.40.128/29	10.8.40.129 – 10.8.40.134	10.8.40.135
18	10.8.40.136/29	10.8.40.137 – 10.8.40.142	10.8.40.143
19	10.8.40.144/29	10.8.40.145 – 10.8.40.150	10.8.40.151
20	10.8.40.152/29	10.8.40.153 – 10.8.40.158	10.8.40.159
21	10.8.40.160/29	10.8.40.161 – 10.8.40.166	10.8.40.167
22	10.8.40.168/29	10.8.40.169 – 10.8.40.174	10.8.40.175
23	10.8.40.176/29	10.8.40.177 – 10.8.40.182	10.8.40.183
24	10.8.40.184/29	10.8.40.185 – 10.8.40.190	10.8.40.191
25	10.8.40.192/29	10.8.40.193 – 10.8.40.198	10.8.40.199
26	10.8.40.200/29	10.8.40.201 – 10.8.40.206	10.8.40.207
27	10.8.40.208/29	10.8.40.209 – 10.8.40.214	10.8.40.215
28	10.8.40.216/29	10.8.40.217 – 10.8.40.222	10.8.40.223
29	10.8.40.224/29	10.8.40.225 – 10.8.40.230	10.8.40.231
30	10.8.40.232/29	10.8.40.233 – 10.8.40.238	10.8.40.239
31	10.8.40.240/29	10.8.40.241 – 10.8.40.246	10.8.40.247
32	10.8.40.248/29	10.8.40.249 – 10.8.40.254	10.8.40.255
33	10.8.41.0/29	10.8.41.1 – 10.8.41.6	10.8.41.7
34	10.8.41.8/29	10.8.41.9 – 10.8.41.14	10.8.41.15
35	10.8.41.16/29	10.8.41.17 – 10.8.41.22	10.8.41.23
36	10.8.41.24/29	10.8.41.25 – 10.8.41.30	10.8.41.31
37	10.8.41.32/29	10.8.41.33 – 10.8.41.38	10.8.41.39
38	10.8.41.40/29	10.8.41.41 – 10.8.41.46	10.8.41.47
39	10.8.41.48/29	10.8.41.49 – 10.8.41.54	10.8.41.55
40	10.8.41.56/29	10.8.41.57 – 10.8.41.62	10.8.41.63
41	10.8.41.64/29	10.8.41.65 – 10.8.41.70	10.8.41.71
42	10.8.41.72/29	10.8.41.73 – 10.8.41.78	10.8.41.79
43	10.8.41.80/29	10.8.41.81 – 10.8.41.86	10.8.41.87
44	10.8.41.88/29	10.8.41.89 – 10.8.41.94	10.8.41.95
45	10.8.41.96/29	10.8.41.97 – 10.8.41.102	10.8.41.103
46	10.8.41.104/29	10.8.41.105 – 10.8.41.110	10.8.41.111
47	10.8.41.112/29	10.8.41.113 – 10.8.41.118	10.8.41.119
48	10.8.41.120/29	10.8.41.121 – 10.8.41.126	10.8.41.127
49	10.8.41.128/29	10.8.41.129 – 10.8.41.134	10.8.41.135
50	10.8.41.136/29	10.8.41.137 – 10.8.41.142	10.8.41.143
51	10.8.41.144/29	10.8.41.145 – 10.8.41.150	10.8.41.151
52	10.8.41.152/29	10.8.41.153 – 10.8.41.158	10.8.41.159
53	10.8.41.160/29	10.8.41.161 – 10.8.41.166	10.8.41.167
54	10.8.41.168/29	10.8.41.169 – 10.8.41.174	10.8.41.175
55	10.8.41.176/29	10.8.41.177 – 10.8.41.182	10.8.41.183
56	10.8.41.184/29	10.8.41.185 – 10.8.41.190	10.8.41.191
57	10.8.41.192/29	10.8.41.193 – 10.8.41.198	10.8.41.199
58	10.8.41.200/29	10.8.41.201 – 10.8.41.206	10.8.41.207
59	10.8.41.208/29	10.8.41.209 – 10.8.41.214	10.8.41.215
60	10.8.41.216/29	10.8.41.217 – 10.8.41.222	10.8.41.223
61	10.8.41.224/29	10.8.41.225 – 10.8.41.230	10.8.41.231
62	10.8.41.232/29	10.8.41.233 – 10.8.41.238	10.8.41.239
63	10.8.41.240/29	10.8.41.241 – 10.8.41.246	10.8.41.247
64	10.8.41.248/29	10.8.41.249 – 10.8.41.254	10.8.41.255
65	10.8.42.0/29	10.8.42.1 – 10.8.42.6	10.8.42.7
66	10.8.42.8/29	10.8.42.9 – 10.8.42.14	10.8.42.15
67	10.8.42.16/29	10.8.42.17 – 10.8.42.22	10.8.42.23
68	10.8.42.24/29	10.8.42.25 – 10.8.42.30	10.8.42.31
69	10.8.42.32/29	10.8.42.33 – 10.8.42.38	10.8.42.39
70	10.8.42.40/29	10.8.42.41 – 10.8.42.46	10.8.42.47
71	10.8.42.48/29	10.8.42.49 – 10.8.42.54	10.8.42.55
72	10.8.42.56/29	10.8.42.57 – 10.8.42.62	10.8.42.63
73	10.8.42.64/29	10.8.42.65 – 10.8.42.70	10.8.42.71
74	10.8.42.72/29	10.8.42.73 – 10.8.42.78	10.8.42.79
75	10.8.42.80/29	10.8.42.81 – 10.8.42.86	10.8.42.87
76	10.8.42.88/29	10.8.42.89 – 10.8.42.94	10.8.42.95
77	10.8.42.96/29	10.8.42.97 – 10.8.42.102	10.8.42.103
78	10.8.42.104/29	10.8.42.105 – 10.8.42.110	10.8.42.111
79	10.8.42.112/29	10.8.42.113 – 10.8.42.118	10.8.42.119
80	10.8.42.120/29	10.8.42.121 – 10.8.42.126	10.8.42.127
81	10.8.42.128/29	10.8.42.129 – 10.8.42.134	10.8.42.135
82	10.8.42.136/29	10.8.42.137 – 10.8.42.142	10.8.42.143
83	10.8.42.144/29	10.8.42.145 – 10.8.42.150	10.8.42.151
84	10.8.42.152/29	10.8.42.153 – 10.8.42.158	10.8.42.159
85	10.8.42.160/29	10.8.42.161 – 10.8.42.166	10.8.42.167
86	10.8.42.168/29	10.8.42.169 – 10.8.42.174	10.8.42.175
87	10.8.42.176/29	10.8.42.177 – 10.8.42.182	10.8.42.183
88	10.8.42.184/29	10.8.42.185 – 10.8.42.190	10.8.42.191
89	10.8.42.192/29	10.8.42.193 – 10.8.42.198	10.8.42.199
90	10.8.42.200/29	10.8.42.201 – 10.8.42.206	10.8.42.207
91	10.8.42.208/29	10.8.42.209 – 10.8.42.214	10.8.42.215
92	10.8.42.216/29	10.8.42.217 – 10.8.42.222	10.8.42.223
93	10.8.42.224/29	10.8.42.225 – 10.8.42.230	10.8.42.231
94	10.8.42.232/29	10.8.42.233 – 10.8.42.238	10.8.42.239
95	10.8.42.240/29	10.8.42.241 – 10.8.42.246	10.8.42.247
96	10.8.42.248/29	10.8.42.249 – 10.8.42.254	10.8.42.255
97	10.8.43.0/29	10.8.43.1 – 10.8.43.6	10.8.43.7
98	10.8.43.8/29	10.8.43.9 – 10.8.43.14	10.8.43.15
99	10.8.43.16/29	10.8.43.17 – 10.8.43.22	10.8.43.23
100	10.8.43.24/29	10.8.43.25 – 10.8.43.30	10.8.43.31
101	10.8.43.32/29	10.8.43.33 – 10.8.43.38	10.8.43.39
102	10.8.43.40/29	10.8.43.41 – 10.8.43.46	10.8.43.47
103	10.8.43.48/29	10.8.43.49 – 10.8.43.54	10.8.43.55
104	10.8.43.56/29	10.8.43.57 – 10.8.43.62	10.8.43.63
105	10.8.43.64/29	10.8.43.65 – 10.8.43.70	10.8.43.71
106	10.8.43.72/29	10.8.43.73 – 10.8.43.78	10.8.43.79
107	10.8.43.80/29	10.8.43.81 – 10.8.43.86	10.8.43.87
108	10.8.43.88/29	10.8.43.89 – 10.8.43.94	10.8.43.95
109	10.8.43.96/29	10.8.43.97 – 10.8.43.102	10.8.43.103
110	10.8.43.104/29	10.8.43.105 – 10.8.43.110	10.8.43.111
111	10.8.43.112/29	10.8.43.113 – 10.8.43.118	10.8.43.119
112	10.8.43.120/29	10.8.43.121 – 10.8.43.126	10.8.43.127
113	10.8.43.128/29	10.8.43.129 – 10.8.43.134	10.8.43.135
114	10.8.43.136/29	10.8.43.137 – 10.8.43.142	10.8.43.143
115	10.8.43.144/29	10.8.43.145 – 10.8.43.150	10.8.43.151
116	10.8.43.152/29	10.8.43.153 – 10.8.43.158	10.8.43.159
117	10.8.43.160/29	10.8.43.161 – 10.8.43.166	10.8.43.167
118	10.8.43.168/29	10.8.43.169 – 10.8.43.174	10.8.43.175
119	10.8.43.176/29	10.8.43.177 – 10.8.43.182	10.8.43.183
120	10.8.43.184/29	10.8.43.185 – 10.8.43.190	10.8.43.191
121	10.8.43.192/29	10.8.43.193 – 10.8.43.198	10.8.43.199
122	10.8.43.200/29	10.8.43.201 – 10.8.43.206	10.8.43.207
123	10.8.43.208/29	10.8.43.209 – 10.8.43.214	10.8.43.215
124	10.8.43.216/29	10.8.43.217 – 10.8.43.222	10.8.43.223
125	10.8.43.224/29	10.8.43.225 – 10.8.43.230	10.8.43.231
126	10.8.43.232/29	10.8.43.233 – 10.8.43.238	10.8.43.239
127	10.8.43.240/29	10.8.43.241 – 10.8.43.246	10.8.43.247
128	10.8.43.248/29	10.8.43.249 – 10.8.43.254	10.8.43.255

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 →