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)10.3.12.0/22

network10.3.12.0/22

broadcast10.3.15.255

first host10.3.12.1

last host10.3.15.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.3.12.0/22

address00001010.00000011.00001100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000011.00001100.00000000

broadcast00001010.00000011.00001111.11111111

green = network part, grey = host part

hex0x0a030c00

decimal167971840

reverse dns0.12.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c00

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.12.0/29	10.3.12.1 – 10.3.12.6	10.3.12.7
2	10.3.12.8/29	10.3.12.9 – 10.3.12.14	10.3.12.15
3	10.3.12.16/29	10.3.12.17 – 10.3.12.22	10.3.12.23
4	10.3.12.24/29	10.3.12.25 – 10.3.12.30	10.3.12.31
5	10.3.12.32/29	10.3.12.33 – 10.3.12.38	10.3.12.39
6	10.3.12.40/29	10.3.12.41 – 10.3.12.46	10.3.12.47
7	10.3.12.48/29	10.3.12.49 – 10.3.12.54	10.3.12.55
8	10.3.12.56/29	10.3.12.57 – 10.3.12.62	10.3.12.63
9	10.3.12.64/29	10.3.12.65 – 10.3.12.70	10.3.12.71
10	10.3.12.72/29	10.3.12.73 – 10.3.12.78	10.3.12.79
11	10.3.12.80/29	10.3.12.81 – 10.3.12.86	10.3.12.87
12	10.3.12.88/29	10.3.12.89 – 10.3.12.94	10.3.12.95
13	10.3.12.96/29	10.3.12.97 – 10.3.12.102	10.3.12.103
14	10.3.12.104/29	10.3.12.105 – 10.3.12.110	10.3.12.111
15	10.3.12.112/29	10.3.12.113 – 10.3.12.118	10.3.12.119
16	10.3.12.120/29	10.3.12.121 – 10.3.12.126	10.3.12.127
17	10.3.12.128/29	10.3.12.129 – 10.3.12.134	10.3.12.135
18	10.3.12.136/29	10.3.12.137 – 10.3.12.142	10.3.12.143
19	10.3.12.144/29	10.3.12.145 – 10.3.12.150	10.3.12.151
20	10.3.12.152/29	10.3.12.153 – 10.3.12.158	10.3.12.159
21	10.3.12.160/29	10.3.12.161 – 10.3.12.166	10.3.12.167
22	10.3.12.168/29	10.3.12.169 – 10.3.12.174	10.3.12.175
23	10.3.12.176/29	10.3.12.177 – 10.3.12.182	10.3.12.183
24	10.3.12.184/29	10.3.12.185 – 10.3.12.190	10.3.12.191
25	10.3.12.192/29	10.3.12.193 – 10.3.12.198	10.3.12.199
26	10.3.12.200/29	10.3.12.201 – 10.3.12.206	10.3.12.207
27	10.3.12.208/29	10.3.12.209 – 10.3.12.214	10.3.12.215
28	10.3.12.216/29	10.3.12.217 – 10.3.12.222	10.3.12.223
29	10.3.12.224/29	10.3.12.225 – 10.3.12.230	10.3.12.231
30	10.3.12.232/29	10.3.12.233 – 10.3.12.238	10.3.12.239
31	10.3.12.240/29	10.3.12.241 – 10.3.12.246	10.3.12.247
32	10.3.12.248/29	10.3.12.249 – 10.3.12.254	10.3.12.255
33	10.3.13.0/29	10.3.13.1 – 10.3.13.6	10.3.13.7
34	10.3.13.8/29	10.3.13.9 – 10.3.13.14	10.3.13.15
35	10.3.13.16/29	10.3.13.17 – 10.3.13.22	10.3.13.23
36	10.3.13.24/29	10.3.13.25 – 10.3.13.30	10.3.13.31
37	10.3.13.32/29	10.3.13.33 – 10.3.13.38	10.3.13.39
38	10.3.13.40/29	10.3.13.41 – 10.3.13.46	10.3.13.47
39	10.3.13.48/29	10.3.13.49 – 10.3.13.54	10.3.13.55
40	10.3.13.56/29	10.3.13.57 – 10.3.13.62	10.3.13.63
41	10.3.13.64/29	10.3.13.65 – 10.3.13.70	10.3.13.71
42	10.3.13.72/29	10.3.13.73 – 10.3.13.78	10.3.13.79
43	10.3.13.80/29	10.3.13.81 – 10.3.13.86	10.3.13.87
44	10.3.13.88/29	10.3.13.89 – 10.3.13.94	10.3.13.95
45	10.3.13.96/29	10.3.13.97 – 10.3.13.102	10.3.13.103
46	10.3.13.104/29	10.3.13.105 – 10.3.13.110	10.3.13.111
47	10.3.13.112/29	10.3.13.113 – 10.3.13.118	10.3.13.119
48	10.3.13.120/29	10.3.13.121 – 10.3.13.126	10.3.13.127
49	10.3.13.128/29	10.3.13.129 – 10.3.13.134	10.3.13.135
50	10.3.13.136/29	10.3.13.137 – 10.3.13.142	10.3.13.143
51	10.3.13.144/29	10.3.13.145 – 10.3.13.150	10.3.13.151
52	10.3.13.152/29	10.3.13.153 – 10.3.13.158	10.3.13.159
53	10.3.13.160/29	10.3.13.161 – 10.3.13.166	10.3.13.167
54	10.3.13.168/29	10.3.13.169 – 10.3.13.174	10.3.13.175
55	10.3.13.176/29	10.3.13.177 – 10.3.13.182	10.3.13.183
56	10.3.13.184/29	10.3.13.185 – 10.3.13.190	10.3.13.191
57	10.3.13.192/29	10.3.13.193 – 10.3.13.198	10.3.13.199
58	10.3.13.200/29	10.3.13.201 – 10.3.13.206	10.3.13.207
59	10.3.13.208/29	10.3.13.209 – 10.3.13.214	10.3.13.215
60	10.3.13.216/29	10.3.13.217 – 10.3.13.222	10.3.13.223
61	10.3.13.224/29	10.3.13.225 – 10.3.13.230	10.3.13.231
62	10.3.13.232/29	10.3.13.233 – 10.3.13.238	10.3.13.239
63	10.3.13.240/29	10.3.13.241 – 10.3.13.246	10.3.13.247
64	10.3.13.248/29	10.3.13.249 – 10.3.13.254	10.3.13.255
65	10.3.14.0/29	10.3.14.1 – 10.3.14.6	10.3.14.7
66	10.3.14.8/29	10.3.14.9 – 10.3.14.14	10.3.14.15
67	10.3.14.16/29	10.3.14.17 – 10.3.14.22	10.3.14.23
68	10.3.14.24/29	10.3.14.25 – 10.3.14.30	10.3.14.31
69	10.3.14.32/29	10.3.14.33 – 10.3.14.38	10.3.14.39
70	10.3.14.40/29	10.3.14.41 – 10.3.14.46	10.3.14.47
71	10.3.14.48/29	10.3.14.49 – 10.3.14.54	10.3.14.55
72	10.3.14.56/29	10.3.14.57 – 10.3.14.62	10.3.14.63
73	10.3.14.64/29	10.3.14.65 – 10.3.14.70	10.3.14.71
74	10.3.14.72/29	10.3.14.73 – 10.3.14.78	10.3.14.79
75	10.3.14.80/29	10.3.14.81 – 10.3.14.86	10.3.14.87
76	10.3.14.88/29	10.3.14.89 – 10.3.14.94	10.3.14.95
77	10.3.14.96/29	10.3.14.97 – 10.3.14.102	10.3.14.103
78	10.3.14.104/29	10.3.14.105 – 10.3.14.110	10.3.14.111
79	10.3.14.112/29	10.3.14.113 – 10.3.14.118	10.3.14.119
80	10.3.14.120/29	10.3.14.121 – 10.3.14.126	10.3.14.127
81	10.3.14.128/29	10.3.14.129 – 10.3.14.134	10.3.14.135
82	10.3.14.136/29	10.3.14.137 – 10.3.14.142	10.3.14.143
83	10.3.14.144/29	10.3.14.145 – 10.3.14.150	10.3.14.151
84	10.3.14.152/29	10.3.14.153 – 10.3.14.158	10.3.14.159
85	10.3.14.160/29	10.3.14.161 – 10.3.14.166	10.3.14.167
86	10.3.14.168/29	10.3.14.169 – 10.3.14.174	10.3.14.175
87	10.3.14.176/29	10.3.14.177 – 10.3.14.182	10.3.14.183
88	10.3.14.184/29	10.3.14.185 – 10.3.14.190	10.3.14.191
89	10.3.14.192/29	10.3.14.193 – 10.3.14.198	10.3.14.199
90	10.3.14.200/29	10.3.14.201 – 10.3.14.206	10.3.14.207
91	10.3.14.208/29	10.3.14.209 – 10.3.14.214	10.3.14.215
92	10.3.14.216/29	10.3.14.217 – 10.3.14.222	10.3.14.223
93	10.3.14.224/29	10.3.14.225 – 10.3.14.230	10.3.14.231
94	10.3.14.232/29	10.3.14.233 – 10.3.14.238	10.3.14.239
95	10.3.14.240/29	10.3.14.241 – 10.3.14.246	10.3.14.247
96	10.3.14.248/29	10.3.14.249 – 10.3.14.254	10.3.14.255
97	10.3.15.0/29	10.3.15.1 – 10.3.15.6	10.3.15.7
98	10.3.15.8/29	10.3.15.9 – 10.3.15.14	10.3.15.15
99	10.3.15.16/29	10.3.15.17 – 10.3.15.22	10.3.15.23
100	10.3.15.24/29	10.3.15.25 – 10.3.15.30	10.3.15.31
101	10.3.15.32/29	10.3.15.33 – 10.3.15.38	10.3.15.39
102	10.3.15.40/29	10.3.15.41 – 10.3.15.46	10.3.15.47
103	10.3.15.48/29	10.3.15.49 – 10.3.15.54	10.3.15.55
104	10.3.15.56/29	10.3.15.57 – 10.3.15.62	10.3.15.63
105	10.3.15.64/29	10.3.15.65 – 10.3.15.70	10.3.15.71
106	10.3.15.72/29	10.3.15.73 – 10.3.15.78	10.3.15.79
107	10.3.15.80/29	10.3.15.81 – 10.3.15.86	10.3.15.87
108	10.3.15.88/29	10.3.15.89 – 10.3.15.94	10.3.15.95
109	10.3.15.96/29	10.3.15.97 – 10.3.15.102	10.3.15.103
110	10.3.15.104/29	10.3.15.105 – 10.3.15.110	10.3.15.111
111	10.3.15.112/29	10.3.15.113 – 10.3.15.118	10.3.15.119
112	10.3.15.120/29	10.3.15.121 – 10.3.15.126	10.3.15.127
113	10.3.15.128/29	10.3.15.129 – 10.3.15.134	10.3.15.135
114	10.3.15.136/29	10.3.15.137 – 10.3.15.142	10.3.15.143
115	10.3.15.144/29	10.3.15.145 – 10.3.15.150	10.3.15.151
116	10.3.15.152/29	10.3.15.153 – 10.3.15.158	10.3.15.159
117	10.3.15.160/29	10.3.15.161 – 10.3.15.166	10.3.15.167
118	10.3.15.168/29	10.3.15.169 – 10.3.15.174	10.3.15.175
119	10.3.15.176/29	10.3.15.177 – 10.3.15.182	10.3.15.183
120	10.3.15.184/29	10.3.15.185 – 10.3.15.190	10.3.15.191
121	10.3.15.192/29	10.3.15.193 – 10.3.15.198	10.3.15.199
122	10.3.15.200/29	10.3.15.201 – 10.3.15.206	10.3.15.207
123	10.3.15.208/29	10.3.15.209 – 10.3.15.214	10.3.15.215
124	10.3.15.216/29	10.3.15.217 – 10.3.15.222	10.3.15.223
125	10.3.15.224/29	10.3.15.225 – 10.3.15.230	10.3.15.231
126	10.3.15.232/29	10.3.15.233 – 10.3.15.238	10.3.15.239
127	10.3.15.240/29	10.3.15.241 – 10.3.15.246	10.3.15.247
128	10.3.15.248/29	10.3.15.249 – 10.3.15.254	10.3.15.255

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 →