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)10.40.8.0/22

network10.40.8.0/22

broadcast10.40.11.255

first host10.40.8.1

last host10.40.11.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.40.8.0/22

address00001010.00101000.00001000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00101000.00001000.00000000

broadcast00001010.00101000.00001011.11111111

green = network part, grey = host part

hex0x0a280800

decimal170395648

reverse dns0.8.40.10.in-addr.arpa

ipv4-mapped::ffff:a28:800

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.40.8.0/29	10.40.8.1 – 10.40.8.6	10.40.8.7
2	10.40.8.8/29	10.40.8.9 – 10.40.8.14	10.40.8.15
3	10.40.8.16/29	10.40.8.17 – 10.40.8.22	10.40.8.23
4	10.40.8.24/29	10.40.8.25 – 10.40.8.30	10.40.8.31
5	10.40.8.32/29	10.40.8.33 – 10.40.8.38	10.40.8.39
6	10.40.8.40/29	10.40.8.41 – 10.40.8.46	10.40.8.47
7	10.40.8.48/29	10.40.8.49 – 10.40.8.54	10.40.8.55
8	10.40.8.56/29	10.40.8.57 – 10.40.8.62	10.40.8.63
9	10.40.8.64/29	10.40.8.65 – 10.40.8.70	10.40.8.71
10	10.40.8.72/29	10.40.8.73 – 10.40.8.78	10.40.8.79
11	10.40.8.80/29	10.40.8.81 – 10.40.8.86	10.40.8.87
12	10.40.8.88/29	10.40.8.89 – 10.40.8.94	10.40.8.95
13	10.40.8.96/29	10.40.8.97 – 10.40.8.102	10.40.8.103
14	10.40.8.104/29	10.40.8.105 – 10.40.8.110	10.40.8.111
15	10.40.8.112/29	10.40.8.113 – 10.40.8.118	10.40.8.119
16	10.40.8.120/29	10.40.8.121 – 10.40.8.126	10.40.8.127
17	10.40.8.128/29	10.40.8.129 – 10.40.8.134	10.40.8.135
18	10.40.8.136/29	10.40.8.137 – 10.40.8.142	10.40.8.143
19	10.40.8.144/29	10.40.8.145 – 10.40.8.150	10.40.8.151
20	10.40.8.152/29	10.40.8.153 – 10.40.8.158	10.40.8.159
21	10.40.8.160/29	10.40.8.161 – 10.40.8.166	10.40.8.167
22	10.40.8.168/29	10.40.8.169 – 10.40.8.174	10.40.8.175
23	10.40.8.176/29	10.40.8.177 – 10.40.8.182	10.40.8.183
24	10.40.8.184/29	10.40.8.185 – 10.40.8.190	10.40.8.191
25	10.40.8.192/29	10.40.8.193 – 10.40.8.198	10.40.8.199
26	10.40.8.200/29	10.40.8.201 – 10.40.8.206	10.40.8.207
27	10.40.8.208/29	10.40.8.209 – 10.40.8.214	10.40.8.215
28	10.40.8.216/29	10.40.8.217 – 10.40.8.222	10.40.8.223
29	10.40.8.224/29	10.40.8.225 – 10.40.8.230	10.40.8.231
30	10.40.8.232/29	10.40.8.233 – 10.40.8.238	10.40.8.239
31	10.40.8.240/29	10.40.8.241 – 10.40.8.246	10.40.8.247
32	10.40.8.248/29	10.40.8.249 – 10.40.8.254	10.40.8.255
33	10.40.9.0/29	10.40.9.1 – 10.40.9.6	10.40.9.7
34	10.40.9.8/29	10.40.9.9 – 10.40.9.14	10.40.9.15
35	10.40.9.16/29	10.40.9.17 – 10.40.9.22	10.40.9.23
36	10.40.9.24/29	10.40.9.25 – 10.40.9.30	10.40.9.31
37	10.40.9.32/29	10.40.9.33 – 10.40.9.38	10.40.9.39
38	10.40.9.40/29	10.40.9.41 – 10.40.9.46	10.40.9.47
39	10.40.9.48/29	10.40.9.49 – 10.40.9.54	10.40.9.55
40	10.40.9.56/29	10.40.9.57 – 10.40.9.62	10.40.9.63
41	10.40.9.64/29	10.40.9.65 – 10.40.9.70	10.40.9.71
42	10.40.9.72/29	10.40.9.73 – 10.40.9.78	10.40.9.79
43	10.40.9.80/29	10.40.9.81 – 10.40.9.86	10.40.9.87
44	10.40.9.88/29	10.40.9.89 – 10.40.9.94	10.40.9.95
45	10.40.9.96/29	10.40.9.97 – 10.40.9.102	10.40.9.103
46	10.40.9.104/29	10.40.9.105 – 10.40.9.110	10.40.9.111
47	10.40.9.112/29	10.40.9.113 – 10.40.9.118	10.40.9.119
48	10.40.9.120/29	10.40.9.121 – 10.40.9.126	10.40.9.127
49	10.40.9.128/29	10.40.9.129 – 10.40.9.134	10.40.9.135
50	10.40.9.136/29	10.40.9.137 – 10.40.9.142	10.40.9.143
51	10.40.9.144/29	10.40.9.145 – 10.40.9.150	10.40.9.151
52	10.40.9.152/29	10.40.9.153 – 10.40.9.158	10.40.9.159
53	10.40.9.160/29	10.40.9.161 – 10.40.9.166	10.40.9.167
54	10.40.9.168/29	10.40.9.169 – 10.40.9.174	10.40.9.175
55	10.40.9.176/29	10.40.9.177 – 10.40.9.182	10.40.9.183
56	10.40.9.184/29	10.40.9.185 – 10.40.9.190	10.40.9.191
57	10.40.9.192/29	10.40.9.193 – 10.40.9.198	10.40.9.199
58	10.40.9.200/29	10.40.9.201 – 10.40.9.206	10.40.9.207
59	10.40.9.208/29	10.40.9.209 – 10.40.9.214	10.40.9.215
60	10.40.9.216/29	10.40.9.217 – 10.40.9.222	10.40.9.223
61	10.40.9.224/29	10.40.9.225 – 10.40.9.230	10.40.9.231
62	10.40.9.232/29	10.40.9.233 – 10.40.9.238	10.40.9.239
63	10.40.9.240/29	10.40.9.241 – 10.40.9.246	10.40.9.247
64	10.40.9.248/29	10.40.9.249 – 10.40.9.254	10.40.9.255
65	10.40.10.0/29	10.40.10.1 – 10.40.10.6	10.40.10.7
66	10.40.10.8/29	10.40.10.9 – 10.40.10.14	10.40.10.15
67	10.40.10.16/29	10.40.10.17 – 10.40.10.22	10.40.10.23
68	10.40.10.24/29	10.40.10.25 – 10.40.10.30	10.40.10.31
69	10.40.10.32/29	10.40.10.33 – 10.40.10.38	10.40.10.39
70	10.40.10.40/29	10.40.10.41 – 10.40.10.46	10.40.10.47
71	10.40.10.48/29	10.40.10.49 – 10.40.10.54	10.40.10.55
72	10.40.10.56/29	10.40.10.57 – 10.40.10.62	10.40.10.63
73	10.40.10.64/29	10.40.10.65 – 10.40.10.70	10.40.10.71
74	10.40.10.72/29	10.40.10.73 – 10.40.10.78	10.40.10.79
75	10.40.10.80/29	10.40.10.81 – 10.40.10.86	10.40.10.87
76	10.40.10.88/29	10.40.10.89 – 10.40.10.94	10.40.10.95
77	10.40.10.96/29	10.40.10.97 – 10.40.10.102	10.40.10.103
78	10.40.10.104/29	10.40.10.105 – 10.40.10.110	10.40.10.111
79	10.40.10.112/29	10.40.10.113 – 10.40.10.118	10.40.10.119
80	10.40.10.120/29	10.40.10.121 – 10.40.10.126	10.40.10.127
81	10.40.10.128/29	10.40.10.129 – 10.40.10.134	10.40.10.135
82	10.40.10.136/29	10.40.10.137 – 10.40.10.142	10.40.10.143
83	10.40.10.144/29	10.40.10.145 – 10.40.10.150	10.40.10.151
84	10.40.10.152/29	10.40.10.153 – 10.40.10.158	10.40.10.159
85	10.40.10.160/29	10.40.10.161 – 10.40.10.166	10.40.10.167
86	10.40.10.168/29	10.40.10.169 – 10.40.10.174	10.40.10.175
87	10.40.10.176/29	10.40.10.177 – 10.40.10.182	10.40.10.183
88	10.40.10.184/29	10.40.10.185 – 10.40.10.190	10.40.10.191
89	10.40.10.192/29	10.40.10.193 – 10.40.10.198	10.40.10.199
90	10.40.10.200/29	10.40.10.201 – 10.40.10.206	10.40.10.207
91	10.40.10.208/29	10.40.10.209 – 10.40.10.214	10.40.10.215
92	10.40.10.216/29	10.40.10.217 – 10.40.10.222	10.40.10.223
93	10.40.10.224/29	10.40.10.225 – 10.40.10.230	10.40.10.231
94	10.40.10.232/29	10.40.10.233 – 10.40.10.238	10.40.10.239
95	10.40.10.240/29	10.40.10.241 – 10.40.10.246	10.40.10.247
96	10.40.10.248/29	10.40.10.249 – 10.40.10.254	10.40.10.255
97	10.40.11.0/29	10.40.11.1 – 10.40.11.6	10.40.11.7
98	10.40.11.8/29	10.40.11.9 – 10.40.11.14	10.40.11.15
99	10.40.11.16/29	10.40.11.17 – 10.40.11.22	10.40.11.23
100	10.40.11.24/29	10.40.11.25 – 10.40.11.30	10.40.11.31
101	10.40.11.32/29	10.40.11.33 – 10.40.11.38	10.40.11.39
102	10.40.11.40/29	10.40.11.41 – 10.40.11.46	10.40.11.47
103	10.40.11.48/29	10.40.11.49 – 10.40.11.54	10.40.11.55
104	10.40.11.56/29	10.40.11.57 – 10.40.11.62	10.40.11.63
105	10.40.11.64/29	10.40.11.65 – 10.40.11.70	10.40.11.71
106	10.40.11.72/29	10.40.11.73 – 10.40.11.78	10.40.11.79
107	10.40.11.80/29	10.40.11.81 – 10.40.11.86	10.40.11.87
108	10.40.11.88/29	10.40.11.89 – 10.40.11.94	10.40.11.95
109	10.40.11.96/29	10.40.11.97 – 10.40.11.102	10.40.11.103
110	10.40.11.104/29	10.40.11.105 – 10.40.11.110	10.40.11.111
111	10.40.11.112/29	10.40.11.113 – 10.40.11.118	10.40.11.119
112	10.40.11.120/29	10.40.11.121 – 10.40.11.126	10.40.11.127
113	10.40.11.128/29	10.40.11.129 – 10.40.11.134	10.40.11.135
114	10.40.11.136/29	10.40.11.137 – 10.40.11.142	10.40.11.143
115	10.40.11.144/29	10.40.11.145 – 10.40.11.150	10.40.11.151
116	10.40.11.152/29	10.40.11.153 – 10.40.11.158	10.40.11.159
117	10.40.11.160/29	10.40.11.161 – 10.40.11.166	10.40.11.167
118	10.40.11.168/29	10.40.11.169 – 10.40.11.174	10.40.11.175
119	10.40.11.176/29	10.40.11.177 – 10.40.11.182	10.40.11.183
120	10.40.11.184/29	10.40.11.185 – 10.40.11.190	10.40.11.191
121	10.40.11.192/29	10.40.11.193 – 10.40.11.198	10.40.11.199
122	10.40.11.200/29	10.40.11.201 – 10.40.11.206	10.40.11.207
123	10.40.11.208/29	10.40.11.209 – 10.40.11.214	10.40.11.215
124	10.40.11.216/29	10.40.11.217 – 10.40.11.222	10.40.11.223
125	10.40.11.224/29	10.40.11.225 – 10.40.11.230	10.40.11.231
126	10.40.11.232/29	10.40.11.233 – 10.40.11.238	10.40.11.239
127	10.40.11.240/29	10.40.11.241 – 10.40.11.246	10.40.11.247
128	10.40.11.248/29	10.40.11.249 – 10.40.11.254	10.40.11.255

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 →