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)10.0.20.0/22

network10.0.20.0/22

broadcast10.0.23.255

first host10.0.20.1

last host10.0.23.254

subnet mask255.255.252.0

wildcard0.0.3.255

addresses1,024

usable hosts1,022

classA

ipcalc 10.0.20.0/22

address00001010.00000000.00010100.00000000

subnet mask11111111.11111111.11111100.00000000

network00001010.00000000.00010100.00000000

broadcast00001010.00000000.00010111.11111111

green = network part, grey = host part

hex0x0a001400

decimal167777280

reverse dns0.20.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:1400

/22 split into /29 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.20.0/29	10.0.20.1 – 10.0.20.6	10.0.20.7
2	10.0.20.8/29	10.0.20.9 – 10.0.20.14	10.0.20.15
3	10.0.20.16/29	10.0.20.17 – 10.0.20.22	10.0.20.23
4	10.0.20.24/29	10.0.20.25 – 10.0.20.30	10.0.20.31
5	10.0.20.32/29	10.0.20.33 – 10.0.20.38	10.0.20.39
6	10.0.20.40/29	10.0.20.41 – 10.0.20.46	10.0.20.47
7	10.0.20.48/29	10.0.20.49 – 10.0.20.54	10.0.20.55
8	10.0.20.56/29	10.0.20.57 – 10.0.20.62	10.0.20.63
9	10.0.20.64/29	10.0.20.65 – 10.0.20.70	10.0.20.71
10	10.0.20.72/29	10.0.20.73 – 10.0.20.78	10.0.20.79
11	10.0.20.80/29	10.0.20.81 – 10.0.20.86	10.0.20.87
12	10.0.20.88/29	10.0.20.89 – 10.0.20.94	10.0.20.95
13	10.0.20.96/29	10.0.20.97 – 10.0.20.102	10.0.20.103
14	10.0.20.104/29	10.0.20.105 – 10.0.20.110	10.0.20.111
15	10.0.20.112/29	10.0.20.113 – 10.0.20.118	10.0.20.119
16	10.0.20.120/29	10.0.20.121 – 10.0.20.126	10.0.20.127
17	10.0.20.128/29	10.0.20.129 – 10.0.20.134	10.0.20.135
18	10.0.20.136/29	10.0.20.137 – 10.0.20.142	10.0.20.143
19	10.0.20.144/29	10.0.20.145 – 10.0.20.150	10.0.20.151
20	10.0.20.152/29	10.0.20.153 – 10.0.20.158	10.0.20.159
21	10.0.20.160/29	10.0.20.161 – 10.0.20.166	10.0.20.167
22	10.0.20.168/29	10.0.20.169 – 10.0.20.174	10.0.20.175
23	10.0.20.176/29	10.0.20.177 – 10.0.20.182	10.0.20.183
24	10.0.20.184/29	10.0.20.185 – 10.0.20.190	10.0.20.191
25	10.0.20.192/29	10.0.20.193 – 10.0.20.198	10.0.20.199
26	10.0.20.200/29	10.0.20.201 – 10.0.20.206	10.0.20.207
27	10.0.20.208/29	10.0.20.209 – 10.0.20.214	10.0.20.215
28	10.0.20.216/29	10.0.20.217 – 10.0.20.222	10.0.20.223
29	10.0.20.224/29	10.0.20.225 – 10.0.20.230	10.0.20.231
30	10.0.20.232/29	10.0.20.233 – 10.0.20.238	10.0.20.239
31	10.0.20.240/29	10.0.20.241 – 10.0.20.246	10.0.20.247
32	10.0.20.248/29	10.0.20.249 – 10.0.20.254	10.0.20.255
33	10.0.21.0/29	10.0.21.1 – 10.0.21.6	10.0.21.7
34	10.0.21.8/29	10.0.21.9 – 10.0.21.14	10.0.21.15
35	10.0.21.16/29	10.0.21.17 – 10.0.21.22	10.0.21.23
36	10.0.21.24/29	10.0.21.25 – 10.0.21.30	10.0.21.31
37	10.0.21.32/29	10.0.21.33 – 10.0.21.38	10.0.21.39
38	10.0.21.40/29	10.0.21.41 – 10.0.21.46	10.0.21.47
39	10.0.21.48/29	10.0.21.49 – 10.0.21.54	10.0.21.55
40	10.0.21.56/29	10.0.21.57 – 10.0.21.62	10.0.21.63
41	10.0.21.64/29	10.0.21.65 – 10.0.21.70	10.0.21.71
42	10.0.21.72/29	10.0.21.73 – 10.0.21.78	10.0.21.79
43	10.0.21.80/29	10.0.21.81 – 10.0.21.86	10.0.21.87
44	10.0.21.88/29	10.0.21.89 – 10.0.21.94	10.0.21.95
45	10.0.21.96/29	10.0.21.97 – 10.0.21.102	10.0.21.103
46	10.0.21.104/29	10.0.21.105 – 10.0.21.110	10.0.21.111
47	10.0.21.112/29	10.0.21.113 – 10.0.21.118	10.0.21.119
48	10.0.21.120/29	10.0.21.121 – 10.0.21.126	10.0.21.127
49	10.0.21.128/29	10.0.21.129 – 10.0.21.134	10.0.21.135
50	10.0.21.136/29	10.0.21.137 – 10.0.21.142	10.0.21.143
51	10.0.21.144/29	10.0.21.145 – 10.0.21.150	10.0.21.151
52	10.0.21.152/29	10.0.21.153 – 10.0.21.158	10.0.21.159
53	10.0.21.160/29	10.0.21.161 – 10.0.21.166	10.0.21.167
54	10.0.21.168/29	10.0.21.169 – 10.0.21.174	10.0.21.175
55	10.0.21.176/29	10.0.21.177 – 10.0.21.182	10.0.21.183
56	10.0.21.184/29	10.0.21.185 – 10.0.21.190	10.0.21.191
57	10.0.21.192/29	10.0.21.193 – 10.0.21.198	10.0.21.199
58	10.0.21.200/29	10.0.21.201 – 10.0.21.206	10.0.21.207
59	10.0.21.208/29	10.0.21.209 – 10.0.21.214	10.0.21.215
60	10.0.21.216/29	10.0.21.217 – 10.0.21.222	10.0.21.223
61	10.0.21.224/29	10.0.21.225 – 10.0.21.230	10.0.21.231
62	10.0.21.232/29	10.0.21.233 – 10.0.21.238	10.0.21.239
63	10.0.21.240/29	10.0.21.241 – 10.0.21.246	10.0.21.247
64	10.0.21.248/29	10.0.21.249 – 10.0.21.254	10.0.21.255
65	10.0.22.0/29	10.0.22.1 – 10.0.22.6	10.0.22.7
66	10.0.22.8/29	10.0.22.9 – 10.0.22.14	10.0.22.15
67	10.0.22.16/29	10.0.22.17 – 10.0.22.22	10.0.22.23
68	10.0.22.24/29	10.0.22.25 – 10.0.22.30	10.0.22.31
69	10.0.22.32/29	10.0.22.33 – 10.0.22.38	10.0.22.39
70	10.0.22.40/29	10.0.22.41 – 10.0.22.46	10.0.22.47
71	10.0.22.48/29	10.0.22.49 – 10.0.22.54	10.0.22.55
72	10.0.22.56/29	10.0.22.57 – 10.0.22.62	10.0.22.63
73	10.0.22.64/29	10.0.22.65 – 10.0.22.70	10.0.22.71
74	10.0.22.72/29	10.0.22.73 – 10.0.22.78	10.0.22.79
75	10.0.22.80/29	10.0.22.81 – 10.0.22.86	10.0.22.87
76	10.0.22.88/29	10.0.22.89 – 10.0.22.94	10.0.22.95
77	10.0.22.96/29	10.0.22.97 – 10.0.22.102	10.0.22.103
78	10.0.22.104/29	10.0.22.105 – 10.0.22.110	10.0.22.111
79	10.0.22.112/29	10.0.22.113 – 10.0.22.118	10.0.22.119
80	10.0.22.120/29	10.0.22.121 – 10.0.22.126	10.0.22.127
81	10.0.22.128/29	10.0.22.129 – 10.0.22.134	10.0.22.135
82	10.0.22.136/29	10.0.22.137 – 10.0.22.142	10.0.22.143
83	10.0.22.144/29	10.0.22.145 – 10.0.22.150	10.0.22.151
84	10.0.22.152/29	10.0.22.153 – 10.0.22.158	10.0.22.159
85	10.0.22.160/29	10.0.22.161 – 10.0.22.166	10.0.22.167
86	10.0.22.168/29	10.0.22.169 – 10.0.22.174	10.0.22.175
87	10.0.22.176/29	10.0.22.177 – 10.0.22.182	10.0.22.183
88	10.0.22.184/29	10.0.22.185 – 10.0.22.190	10.0.22.191
89	10.0.22.192/29	10.0.22.193 – 10.0.22.198	10.0.22.199
90	10.0.22.200/29	10.0.22.201 – 10.0.22.206	10.0.22.207
91	10.0.22.208/29	10.0.22.209 – 10.0.22.214	10.0.22.215
92	10.0.22.216/29	10.0.22.217 – 10.0.22.222	10.0.22.223
93	10.0.22.224/29	10.0.22.225 – 10.0.22.230	10.0.22.231
94	10.0.22.232/29	10.0.22.233 – 10.0.22.238	10.0.22.239
95	10.0.22.240/29	10.0.22.241 – 10.0.22.246	10.0.22.247
96	10.0.22.248/29	10.0.22.249 – 10.0.22.254	10.0.22.255
97	10.0.23.0/29	10.0.23.1 – 10.0.23.6	10.0.23.7
98	10.0.23.8/29	10.0.23.9 – 10.0.23.14	10.0.23.15
99	10.0.23.16/29	10.0.23.17 – 10.0.23.22	10.0.23.23
100	10.0.23.24/29	10.0.23.25 – 10.0.23.30	10.0.23.31
101	10.0.23.32/29	10.0.23.33 – 10.0.23.38	10.0.23.39
102	10.0.23.40/29	10.0.23.41 – 10.0.23.46	10.0.23.47
103	10.0.23.48/29	10.0.23.49 – 10.0.23.54	10.0.23.55
104	10.0.23.56/29	10.0.23.57 – 10.0.23.62	10.0.23.63
105	10.0.23.64/29	10.0.23.65 – 10.0.23.70	10.0.23.71
106	10.0.23.72/29	10.0.23.73 – 10.0.23.78	10.0.23.79
107	10.0.23.80/29	10.0.23.81 – 10.0.23.86	10.0.23.87
108	10.0.23.88/29	10.0.23.89 – 10.0.23.94	10.0.23.95
109	10.0.23.96/29	10.0.23.97 – 10.0.23.102	10.0.23.103
110	10.0.23.104/29	10.0.23.105 – 10.0.23.110	10.0.23.111
111	10.0.23.112/29	10.0.23.113 – 10.0.23.118	10.0.23.119
112	10.0.23.120/29	10.0.23.121 – 10.0.23.126	10.0.23.127
113	10.0.23.128/29	10.0.23.129 – 10.0.23.134	10.0.23.135
114	10.0.23.136/29	10.0.23.137 – 10.0.23.142	10.0.23.143
115	10.0.23.144/29	10.0.23.145 – 10.0.23.150	10.0.23.151
116	10.0.23.152/29	10.0.23.153 – 10.0.23.158	10.0.23.159
117	10.0.23.160/29	10.0.23.161 – 10.0.23.166	10.0.23.167
118	10.0.23.168/29	10.0.23.169 – 10.0.23.174	10.0.23.175
119	10.0.23.176/29	10.0.23.177 – 10.0.23.182	10.0.23.183
120	10.0.23.184/29	10.0.23.185 – 10.0.23.190	10.0.23.191
121	10.0.23.192/29	10.0.23.193 – 10.0.23.198	10.0.23.199
122	10.0.23.200/29	10.0.23.201 – 10.0.23.206	10.0.23.207
123	10.0.23.208/29	10.0.23.209 – 10.0.23.214	10.0.23.215
124	10.0.23.216/29	10.0.23.217 – 10.0.23.222	10.0.23.223
125	10.0.23.224/29	10.0.23.225 – 10.0.23.230	10.0.23.231
126	10.0.23.232/29	10.0.23.233 – 10.0.23.238	10.0.23.239
127	10.0.23.240/29	10.0.23.241 – 10.0.23.246	10.0.23.247
128	10.0.23.248/29	10.0.23.249 – 10.0.23.254	10.0.23.255

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 →