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)10.2.128.0/22

network10.2.128.0/22

broadcast10.2.131.255

first host10.2.128.1

last host10.2.131.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.2.128.0/22

address00001010.00000010.10000000.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000010.10000000.00000000

broadcast00001010.00000010.10000011.11111111

green = network part, grey = host part

hex0x0a028000

decimal167936000

reverse dns0.128.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8000

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.128.0/29	10.2.128.1 – 10.2.128.6	10.2.128.7
2	10.2.128.8/29	10.2.128.9 – 10.2.128.14	10.2.128.15
3	10.2.128.16/29	10.2.128.17 – 10.2.128.22	10.2.128.23
4	10.2.128.24/29	10.2.128.25 – 10.2.128.30	10.2.128.31
5	10.2.128.32/29	10.2.128.33 – 10.2.128.38	10.2.128.39
6	10.2.128.40/29	10.2.128.41 – 10.2.128.46	10.2.128.47
7	10.2.128.48/29	10.2.128.49 – 10.2.128.54	10.2.128.55
8	10.2.128.56/29	10.2.128.57 – 10.2.128.62	10.2.128.63
9	10.2.128.64/29	10.2.128.65 – 10.2.128.70	10.2.128.71
10	10.2.128.72/29	10.2.128.73 – 10.2.128.78	10.2.128.79
11	10.2.128.80/29	10.2.128.81 – 10.2.128.86	10.2.128.87
12	10.2.128.88/29	10.2.128.89 – 10.2.128.94	10.2.128.95
13	10.2.128.96/29	10.2.128.97 – 10.2.128.102	10.2.128.103
14	10.2.128.104/29	10.2.128.105 – 10.2.128.110	10.2.128.111
15	10.2.128.112/29	10.2.128.113 – 10.2.128.118	10.2.128.119
16	10.2.128.120/29	10.2.128.121 – 10.2.128.126	10.2.128.127
17	10.2.128.128/29	10.2.128.129 – 10.2.128.134	10.2.128.135
18	10.2.128.136/29	10.2.128.137 – 10.2.128.142	10.2.128.143
19	10.2.128.144/29	10.2.128.145 – 10.2.128.150	10.2.128.151
20	10.2.128.152/29	10.2.128.153 – 10.2.128.158	10.2.128.159
21	10.2.128.160/29	10.2.128.161 – 10.2.128.166	10.2.128.167
22	10.2.128.168/29	10.2.128.169 – 10.2.128.174	10.2.128.175
23	10.2.128.176/29	10.2.128.177 – 10.2.128.182	10.2.128.183
24	10.2.128.184/29	10.2.128.185 – 10.2.128.190	10.2.128.191
25	10.2.128.192/29	10.2.128.193 – 10.2.128.198	10.2.128.199
26	10.2.128.200/29	10.2.128.201 – 10.2.128.206	10.2.128.207
27	10.2.128.208/29	10.2.128.209 – 10.2.128.214	10.2.128.215
28	10.2.128.216/29	10.2.128.217 – 10.2.128.222	10.2.128.223
29	10.2.128.224/29	10.2.128.225 – 10.2.128.230	10.2.128.231
30	10.2.128.232/29	10.2.128.233 – 10.2.128.238	10.2.128.239
31	10.2.128.240/29	10.2.128.241 – 10.2.128.246	10.2.128.247
32	10.2.128.248/29	10.2.128.249 – 10.2.128.254	10.2.128.255
33	10.2.129.0/29	10.2.129.1 – 10.2.129.6	10.2.129.7
34	10.2.129.8/29	10.2.129.9 – 10.2.129.14	10.2.129.15
35	10.2.129.16/29	10.2.129.17 – 10.2.129.22	10.2.129.23
36	10.2.129.24/29	10.2.129.25 – 10.2.129.30	10.2.129.31
37	10.2.129.32/29	10.2.129.33 – 10.2.129.38	10.2.129.39
38	10.2.129.40/29	10.2.129.41 – 10.2.129.46	10.2.129.47
39	10.2.129.48/29	10.2.129.49 – 10.2.129.54	10.2.129.55
40	10.2.129.56/29	10.2.129.57 – 10.2.129.62	10.2.129.63
41	10.2.129.64/29	10.2.129.65 – 10.2.129.70	10.2.129.71
42	10.2.129.72/29	10.2.129.73 – 10.2.129.78	10.2.129.79
43	10.2.129.80/29	10.2.129.81 – 10.2.129.86	10.2.129.87
44	10.2.129.88/29	10.2.129.89 – 10.2.129.94	10.2.129.95
45	10.2.129.96/29	10.2.129.97 – 10.2.129.102	10.2.129.103
46	10.2.129.104/29	10.2.129.105 – 10.2.129.110	10.2.129.111
47	10.2.129.112/29	10.2.129.113 – 10.2.129.118	10.2.129.119
48	10.2.129.120/29	10.2.129.121 – 10.2.129.126	10.2.129.127
49	10.2.129.128/29	10.2.129.129 – 10.2.129.134	10.2.129.135
50	10.2.129.136/29	10.2.129.137 – 10.2.129.142	10.2.129.143
51	10.2.129.144/29	10.2.129.145 – 10.2.129.150	10.2.129.151
52	10.2.129.152/29	10.2.129.153 – 10.2.129.158	10.2.129.159
53	10.2.129.160/29	10.2.129.161 – 10.2.129.166	10.2.129.167
54	10.2.129.168/29	10.2.129.169 – 10.2.129.174	10.2.129.175
55	10.2.129.176/29	10.2.129.177 – 10.2.129.182	10.2.129.183
56	10.2.129.184/29	10.2.129.185 – 10.2.129.190	10.2.129.191
57	10.2.129.192/29	10.2.129.193 – 10.2.129.198	10.2.129.199
58	10.2.129.200/29	10.2.129.201 – 10.2.129.206	10.2.129.207
59	10.2.129.208/29	10.2.129.209 – 10.2.129.214	10.2.129.215
60	10.2.129.216/29	10.2.129.217 – 10.2.129.222	10.2.129.223
61	10.2.129.224/29	10.2.129.225 – 10.2.129.230	10.2.129.231
62	10.2.129.232/29	10.2.129.233 – 10.2.129.238	10.2.129.239
63	10.2.129.240/29	10.2.129.241 – 10.2.129.246	10.2.129.247
64	10.2.129.248/29	10.2.129.249 – 10.2.129.254	10.2.129.255
65	10.2.130.0/29	10.2.130.1 – 10.2.130.6	10.2.130.7
66	10.2.130.8/29	10.2.130.9 – 10.2.130.14	10.2.130.15
67	10.2.130.16/29	10.2.130.17 – 10.2.130.22	10.2.130.23
68	10.2.130.24/29	10.2.130.25 – 10.2.130.30	10.2.130.31
69	10.2.130.32/29	10.2.130.33 – 10.2.130.38	10.2.130.39
70	10.2.130.40/29	10.2.130.41 – 10.2.130.46	10.2.130.47
71	10.2.130.48/29	10.2.130.49 – 10.2.130.54	10.2.130.55
72	10.2.130.56/29	10.2.130.57 – 10.2.130.62	10.2.130.63
73	10.2.130.64/29	10.2.130.65 – 10.2.130.70	10.2.130.71
74	10.2.130.72/29	10.2.130.73 – 10.2.130.78	10.2.130.79
75	10.2.130.80/29	10.2.130.81 – 10.2.130.86	10.2.130.87
76	10.2.130.88/29	10.2.130.89 – 10.2.130.94	10.2.130.95
77	10.2.130.96/29	10.2.130.97 – 10.2.130.102	10.2.130.103
78	10.2.130.104/29	10.2.130.105 – 10.2.130.110	10.2.130.111
79	10.2.130.112/29	10.2.130.113 – 10.2.130.118	10.2.130.119
80	10.2.130.120/29	10.2.130.121 – 10.2.130.126	10.2.130.127
81	10.2.130.128/29	10.2.130.129 – 10.2.130.134	10.2.130.135
82	10.2.130.136/29	10.2.130.137 – 10.2.130.142	10.2.130.143
83	10.2.130.144/29	10.2.130.145 – 10.2.130.150	10.2.130.151
84	10.2.130.152/29	10.2.130.153 – 10.2.130.158	10.2.130.159
85	10.2.130.160/29	10.2.130.161 – 10.2.130.166	10.2.130.167
86	10.2.130.168/29	10.2.130.169 – 10.2.130.174	10.2.130.175
87	10.2.130.176/29	10.2.130.177 – 10.2.130.182	10.2.130.183
88	10.2.130.184/29	10.2.130.185 – 10.2.130.190	10.2.130.191
89	10.2.130.192/29	10.2.130.193 – 10.2.130.198	10.2.130.199
90	10.2.130.200/29	10.2.130.201 – 10.2.130.206	10.2.130.207
91	10.2.130.208/29	10.2.130.209 – 10.2.130.214	10.2.130.215
92	10.2.130.216/29	10.2.130.217 – 10.2.130.222	10.2.130.223
93	10.2.130.224/29	10.2.130.225 – 10.2.130.230	10.2.130.231
94	10.2.130.232/29	10.2.130.233 – 10.2.130.238	10.2.130.239
95	10.2.130.240/29	10.2.130.241 – 10.2.130.246	10.2.130.247
96	10.2.130.248/29	10.2.130.249 – 10.2.130.254	10.2.130.255
97	10.2.131.0/29	10.2.131.1 – 10.2.131.6	10.2.131.7
98	10.2.131.8/29	10.2.131.9 – 10.2.131.14	10.2.131.15
99	10.2.131.16/29	10.2.131.17 – 10.2.131.22	10.2.131.23
100	10.2.131.24/29	10.2.131.25 – 10.2.131.30	10.2.131.31
101	10.2.131.32/29	10.2.131.33 – 10.2.131.38	10.2.131.39
102	10.2.131.40/29	10.2.131.41 – 10.2.131.46	10.2.131.47
103	10.2.131.48/29	10.2.131.49 – 10.2.131.54	10.2.131.55
104	10.2.131.56/29	10.2.131.57 – 10.2.131.62	10.2.131.63
105	10.2.131.64/29	10.2.131.65 – 10.2.131.70	10.2.131.71
106	10.2.131.72/29	10.2.131.73 – 10.2.131.78	10.2.131.79
107	10.2.131.80/29	10.2.131.81 – 10.2.131.86	10.2.131.87
108	10.2.131.88/29	10.2.131.89 – 10.2.131.94	10.2.131.95
109	10.2.131.96/29	10.2.131.97 – 10.2.131.102	10.2.131.103
110	10.2.131.104/29	10.2.131.105 – 10.2.131.110	10.2.131.111
111	10.2.131.112/29	10.2.131.113 – 10.2.131.118	10.2.131.119
112	10.2.131.120/29	10.2.131.121 – 10.2.131.126	10.2.131.127
113	10.2.131.128/29	10.2.131.129 – 10.2.131.134	10.2.131.135
114	10.2.131.136/29	10.2.131.137 – 10.2.131.142	10.2.131.143
115	10.2.131.144/29	10.2.131.145 – 10.2.131.150	10.2.131.151
116	10.2.131.152/29	10.2.131.153 – 10.2.131.158	10.2.131.159
117	10.2.131.160/29	10.2.131.161 – 10.2.131.166	10.2.131.167
118	10.2.131.168/29	10.2.131.169 – 10.2.131.174	10.2.131.175
119	10.2.131.176/29	10.2.131.177 – 10.2.131.182	10.2.131.183
120	10.2.131.184/29	10.2.131.185 – 10.2.131.190	10.2.131.191
121	10.2.131.192/29	10.2.131.193 – 10.2.131.198	10.2.131.199
122	10.2.131.200/29	10.2.131.201 – 10.2.131.206	10.2.131.207
123	10.2.131.208/29	10.2.131.209 – 10.2.131.214	10.2.131.215
124	10.2.131.216/29	10.2.131.217 – 10.2.131.222	10.2.131.223
125	10.2.131.224/29	10.2.131.225 – 10.2.131.230	10.2.131.231
126	10.2.131.232/29	10.2.131.233 – 10.2.131.238	10.2.131.239
127	10.2.131.240/29	10.2.131.241 – 10.2.131.246	10.2.131.247
128	10.2.131.248/29	10.2.131.249 – 10.2.131.254	10.2.131.255

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 →