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)10.3.20.0/22

network10.3.20.0/22

broadcast10.3.23.255

first host10.3.20.1

last host10.3.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.3.20.0/22

address00001010.00000011.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000011.00010100.00000000

broadcast00001010.00000011.00010111.11111111

green = network part, grey = host part

hex0x0a031400

decimal167973888

reverse dns0.20.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:1400

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.20.0/29	10.3.20.1 – 10.3.20.6	10.3.20.7
2	10.3.20.8/29	10.3.20.9 – 10.3.20.14	10.3.20.15
3	10.3.20.16/29	10.3.20.17 – 10.3.20.22	10.3.20.23
4	10.3.20.24/29	10.3.20.25 – 10.3.20.30	10.3.20.31
5	10.3.20.32/29	10.3.20.33 – 10.3.20.38	10.3.20.39
6	10.3.20.40/29	10.3.20.41 – 10.3.20.46	10.3.20.47
7	10.3.20.48/29	10.3.20.49 – 10.3.20.54	10.3.20.55
8	10.3.20.56/29	10.3.20.57 – 10.3.20.62	10.3.20.63
9	10.3.20.64/29	10.3.20.65 – 10.3.20.70	10.3.20.71
10	10.3.20.72/29	10.3.20.73 – 10.3.20.78	10.3.20.79
11	10.3.20.80/29	10.3.20.81 – 10.3.20.86	10.3.20.87
12	10.3.20.88/29	10.3.20.89 – 10.3.20.94	10.3.20.95
13	10.3.20.96/29	10.3.20.97 – 10.3.20.102	10.3.20.103
14	10.3.20.104/29	10.3.20.105 – 10.3.20.110	10.3.20.111
15	10.3.20.112/29	10.3.20.113 – 10.3.20.118	10.3.20.119
16	10.3.20.120/29	10.3.20.121 – 10.3.20.126	10.3.20.127
17	10.3.20.128/29	10.3.20.129 – 10.3.20.134	10.3.20.135
18	10.3.20.136/29	10.3.20.137 – 10.3.20.142	10.3.20.143
19	10.3.20.144/29	10.3.20.145 – 10.3.20.150	10.3.20.151
20	10.3.20.152/29	10.3.20.153 – 10.3.20.158	10.3.20.159
21	10.3.20.160/29	10.3.20.161 – 10.3.20.166	10.3.20.167
22	10.3.20.168/29	10.3.20.169 – 10.3.20.174	10.3.20.175
23	10.3.20.176/29	10.3.20.177 – 10.3.20.182	10.3.20.183
24	10.3.20.184/29	10.3.20.185 – 10.3.20.190	10.3.20.191
25	10.3.20.192/29	10.3.20.193 – 10.3.20.198	10.3.20.199
26	10.3.20.200/29	10.3.20.201 – 10.3.20.206	10.3.20.207
27	10.3.20.208/29	10.3.20.209 – 10.3.20.214	10.3.20.215
28	10.3.20.216/29	10.3.20.217 – 10.3.20.222	10.3.20.223
29	10.3.20.224/29	10.3.20.225 – 10.3.20.230	10.3.20.231
30	10.3.20.232/29	10.3.20.233 – 10.3.20.238	10.3.20.239
31	10.3.20.240/29	10.3.20.241 – 10.3.20.246	10.3.20.247
32	10.3.20.248/29	10.3.20.249 – 10.3.20.254	10.3.20.255
33	10.3.21.0/29	10.3.21.1 – 10.3.21.6	10.3.21.7
34	10.3.21.8/29	10.3.21.9 – 10.3.21.14	10.3.21.15
35	10.3.21.16/29	10.3.21.17 – 10.3.21.22	10.3.21.23
36	10.3.21.24/29	10.3.21.25 – 10.3.21.30	10.3.21.31
37	10.3.21.32/29	10.3.21.33 – 10.3.21.38	10.3.21.39
38	10.3.21.40/29	10.3.21.41 – 10.3.21.46	10.3.21.47
39	10.3.21.48/29	10.3.21.49 – 10.3.21.54	10.3.21.55
40	10.3.21.56/29	10.3.21.57 – 10.3.21.62	10.3.21.63
41	10.3.21.64/29	10.3.21.65 – 10.3.21.70	10.3.21.71
42	10.3.21.72/29	10.3.21.73 – 10.3.21.78	10.3.21.79
43	10.3.21.80/29	10.3.21.81 – 10.3.21.86	10.3.21.87
44	10.3.21.88/29	10.3.21.89 – 10.3.21.94	10.3.21.95
45	10.3.21.96/29	10.3.21.97 – 10.3.21.102	10.3.21.103
46	10.3.21.104/29	10.3.21.105 – 10.3.21.110	10.3.21.111
47	10.3.21.112/29	10.3.21.113 – 10.3.21.118	10.3.21.119
48	10.3.21.120/29	10.3.21.121 – 10.3.21.126	10.3.21.127
49	10.3.21.128/29	10.3.21.129 – 10.3.21.134	10.3.21.135
50	10.3.21.136/29	10.3.21.137 – 10.3.21.142	10.3.21.143
51	10.3.21.144/29	10.3.21.145 – 10.3.21.150	10.3.21.151
52	10.3.21.152/29	10.3.21.153 – 10.3.21.158	10.3.21.159
53	10.3.21.160/29	10.3.21.161 – 10.3.21.166	10.3.21.167
54	10.3.21.168/29	10.3.21.169 – 10.3.21.174	10.3.21.175
55	10.3.21.176/29	10.3.21.177 – 10.3.21.182	10.3.21.183
56	10.3.21.184/29	10.3.21.185 – 10.3.21.190	10.3.21.191
57	10.3.21.192/29	10.3.21.193 – 10.3.21.198	10.3.21.199
58	10.3.21.200/29	10.3.21.201 – 10.3.21.206	10.3.21.207
59	10.3.21.208/29	10.3.21.209 – 10.3.21.214	10.3.21.215
60	10.3.21.216/29	10.3.21.217 – 10.3.21.222	10.3.21.223
61	10.3.21.224/29	10.3.21.225 – 10.3.21.230	10.3.21.231
62	10.3.21.232/29	10.3.21.233 – 10.3.21.238	10.3.21.239
63	10.3.21.240/29	10.3.21.241 – 10.3.21.246	10.3.21.247
64	10.3.21.248/29	10.3.21.249 – 10.3.21.254	10.3.21.255
65	10.3.22.0/29	10.3.22.1 – 10.3.22.6	10.3.22.7
66	10.3.22.8/29	10.3.22.9 – 10.3.22.14	10.3.22.15
67	10.3.22.16/29	10.3.22.17 – 10.3.22.22	10.3.22.23
68	10.3.22.24/29	10.3.22.25 – 10.3.22.30	10.3.22.31
69	10.3.22.32/29	10.3.22.33 – 10.3.22.38	10.3.22.39
70	10.3.22.40/29	10.3.22.41 – 10.3.22.46	10.3.22.47
71	10.3.22.48/29	10.3.22.49 – 10.3.22.54	10.3.22.55
72	10.3.22.56/29	10.3.22.57 – 10.3.22.62	10.3.22.63
73	10.3.22.64/29	10.3.22.65 – 10.3.22.70	10.3.22.71
74	10.3.22.72/29	10.3.22.73 – 10.3.22.78	10.3.22.79
75	10.3.22.80/29	10.3.22.81 – 10.3.22.86	10.3.22.87
76	10.3.22.88/29	10.3.22.89 – 10.3.22.94	10.3.22.95
77	10.3.22.96/29	10.3.22.97 – 10.3.22.102	10.3.22.103
78	10.3.22.104/29	10.3.22.105 – 10.3.22.110	10.3.22.111
79	10.3.22.112/29	10.3.22.113 – 10.3.22.118	10.3.22.119
80	10.3.22.120/29	10.3.22.121 – 10.3.22.126	10.3.22.127
81	10.3.22.128/29	10.3.22.129 – 10.3.22.134	10.3.22.135
82	10.3.22.136/29	10.3.22.137 – 10.3.22.142	10.3.22.143
83	10.3.22.144/29	10.3.22.145 – 10.3.22.150	10.3.22.151
84	10.3.22.152/29	10.3.22.153 – 10.3.22.158	10.3.22.159
85	10.3.22.160/29	10.3.22.161 – 10.3.22.166	10.3.22.167
86	10.3.22.168/29	10.3.22.169 – 10.3.22.174	10.3.22.175
87	10.3.22.176/29	10.3.22.177 – 10.3.22.182	10.3.22.183
88	10.3.22.184/29	10.3.22.185 – 10.3.22.190	10.3.22.191
89	10.3.22.192/29	10.3.22.193 – 10.3.22.198	10.3.22.199
90	10.3.22.200/29	10.3.22.201 – 10.3.22.206	10.3.22.207
91	10.3.22.208/29	10.3.22.209 – 10.3.22.214	10.3.22.215
92	10.3.22.216/29	10.3.22.217 – 10.3.22.222	10.3.22.223
93	10.3.22.224/29	10.3.22.225 – 10.3.22.230	10.3.22.231
94	10.3.22.232/29	10.3.22.233 – 10.3.22.238	10.3.22.239
95	10.3.22.240/29	10.3.22.241 – 10.3.22.246	10.3.22.247
96	10.3.22.248/29	10.3.22.249 – 10.3.22.254	10.3.22.255
97	10.3.23.0/29	10.3.23.1 – 10.3.23.6	10.3.23.7
98	10.3.23.8/29	10.3.23.9 – 10.3.23.14	10.3.23.15
99	10.3.23.16/29	10.3.23.17 – 10.3.23.22	10.3.23.23
100	10.3.23.24/29	10.3.23.25 – 10.3.23.30	10.3.23.31
101	10.3.23.32/29	10.3.23.33 – 10.3.23.38	10.3.23.39
102	10.3.23.40/29	10.3.23.41 – 10.3.23.46	10.3.23.47
103	10.3.23.48/29	10.3.23.49 – 10.3.23.54	10.3.23.55
104	10.3.23.56/29	10.3.23.57 – 10.3.23.62	10.3.23.63
105	10.3.23.64/29	10.3.23.65 – 10.3.23.70	10.3.23.71
106	10.3.23.72/29	10.3.23.73 – 10.3.23.78	10.3.23.79
107	10.3.23.80/29	10.3.23.81 – 10.3.23.86	10.3.23.87
108	10.3.23.88/29	10.3.23.89 – 10.3.23.94	10.3.23.95
109	10.3.23.96/29	10.3.23.97 – 10.3.23.102	10.3.23.103
110	10.3.23.104/29	10.3.23.105 – 10.3.23.110	10.3.23.111
111	10.3.23.112/29	10.3.23.113 – 10.3.23.118	10.3.23.119
112	10.3.23.120/29	10.3.23.121 – 10.3.23.126	10.3.23.127
113	10.3.23.128/29	10.3.23.129 – 10.3.23.134	10.3.23.135
114	10.3.23.136/29	10.3.23.137 – 10.3.23.142	10.3.23.143
115	10.3.23.144/29	10.3.23.145 – 10.3.23.150	10.3.23.151
116	10.3.23.152/29	10.3.23.153 – 10.3.23.158	10.3.23.159
117	10.3.23.160/29	10.3.23.161 – 10.3.23.166	10.3.23.167
118	10.3.23.168/29	10.3.23.169 – 10.3.23.174	10.3.23.175
119	10.3.23.176/29	10.3.23.177 – 10.3.23.182	10.3.23.183
120	10.3.23.184/29	10.3.23.185 – 10.3.23.190	10.3.23.191
121	10.3.23.192/29	10.3.23.193 – 10.3.23.198	10.3.23.199
122	10.3.23.200/29	10.3.23.201 – 10.3.23.206	10.3.23.207
123	10.3.23.208/29	10.3.23.209 – 10.3.23.214	10.3.23.215
124	10.3.23.216/29	10.3.23.217 – 10.3.23.222	10.3.23.223
125	10.3.23.224/29	10.3.23.225 – 10.3.23.230	10.3.23.231
126	10.3.23.232/29	10.3.23.233 – 10.3.23.238	10.3.23.239
127	10.3.23.240/29	10.3.23.241 – 10.3.23.246	10.3.23.247
128	10.3.23.248/29	10.3.23.249 – 10.3.23.254	10.3.23.255

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 →