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)10.65.82.0/23

network10.65.82.0/23

broadcast10.65.83.255

first host10.65.82.1

last host10.65.83.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.65.82.0/23

address00001010.01000001.01010010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000001.01010010.00000000

broadcast00001010.01000001.01010011.11111111

green = network part, grey = host part

hex0x0a415200

decimal172052992

reverse dns0.82.65.10.in-addr.arpa

ipv4-mapped::ffff:a41:5200

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.65.82.0/30	10.65.82.1 – 10.65.82.2	10.65.82.3
2	10.65.82.4/30	10.65.82.5 – 10.65.82.6	10.65.82.7
3	10.65.82.8/30	10.65.82.9 – 10.65.82.10	10.65.82.11
4	10.65.82.12/30	10.65.82.13 – 10.65.82.14	10.65.82.15
5	10.65.82.16/30	10.65.82.17 – 10.65.82.18	10.65.82.19
6	10.65.82.20/30	10.65.82.21 – 10.65.82.22	10.65.82.23
7	10.65.82.24/30	10.65.82.25 – 10.65.82.26	10.65.82.27
8	10.65.82.28/30	10.65.82.29 – 10.65.82.30	10.65.82.31
9	10.65.82.32/30	10.65.82.33 – 10.65.82.34	10.65.82.35
10	10.65.82.36/30	10.65.82.37 – 10.65.82.38	10.65.82.39
11	10.65.82.40/30	10.65.82.41 – 10.65.82.42	10.65.82.43
12	10.65.82.44/30	10.65.82.45 – 10.65.82.46	10.65.82.47
13	10.65.82.48/30	10.65.82.49 – 10.65.82.50	10.65.82.51
14	10.65.82.52/30	10.65.82.53 – 10.65.82.54	10.65.82.55
15	10.65.82.56/30	10.65.82.57 – 10.65.82.58	10.65.82.59
16	10.65.82.60/30	10.65.82.61 – 10.65.82.62	10.65.82.63
17	10.65.82.64/30	10.65.82.65 – 10.65.82.66	10.65.82.67
18	10.65.82.68/30	10.65.82.69 – 10.65.82.70	10.65.82.71
19	10.65.82.72/30	10.65.82.73 – 10.65.82.74	10.65.82.75
20	10.65.82.76/30	10.65.82.77 – 10.65.82.78	10.65.82.79
21	10.65.82.80/30	10.65.82.81 – 10.65.82.82	10.65.82.83
22	10.65.82.84/30	10.65.82.85 – 10.65.82.86	10.65.82.87
23	10.65.82.88/30	10.65.82.89 – 10.65.82.90	10.65.82.91
24	10.65.82.92/30	10.65.82.93 – 10.65.82.94	10.65.82.95
25	10.65.82.96/30	10.65.82.97 – 10.65.82.98	10.65.82.99
26	10.65.82.100/30	10.65.82.101 – 10.65.82.102	10.65.82.103
27	10.65.82.104/30	10.65.82.105 – 10.65.82.106	10.65.82.107
28	10.65.82.108/30	10.65.82.109 – 10.65.82.110	10.65.82.111
29	10.65.82.112/30	10.65.82.113 – 10.65.82.114	10.65.82.115
30	10.65.82.116/30	10.65.82.117 – 10.65.82.118	10.65.82.119
31	10.65.82.120/30	10.65.82.121 – 10.65.82.122	10.65.82.123
32	10.65.82.124/30	10.65.82.125 – 10.65.82.126	10.65.82.127
33	10.65.82.128/30	10.65.82.129 – 10.65.82.130	10.65.82.131
34	10.65.82.132/30	10.65.82.133 – 10.65.82.134	10.65.82.135
35	10.65.82.136/30	10.65.82.137 – 10.65.82.138	10.65.82.139
36	10.65.82.140/30	10.65.82.141 – 10.65.82.142	10.65.82.143
37	10.65.82.144/30	10.65.82.145 – 10.65.82.146	10.65.82.147
38	10.65.82.148/30	10.65.82.149 – 10.65.82.150	10.65.82.151
39	10.65.82.152/30	10.65.82.153 – 10.65.82.154	10.65.82.155
40	10.65.82.156/30	10.65.82.157 – 10.65.82.158	10.65.82.159
41	10.65.82.160/30	10.65.82.161 – 10.65.82.162	10.65.82.163
42	10.65.82.164/30	10.65.82.165 – 10.65.82.166	10.65.82.167
43	10.65.82.168/30	10.65.82.169 – 10.65.82.170	10.65.82.171
44	10.65.82.172/30	10.65.82.173 – 10.65.82.174	10.65.82.175
45	10.65.82.176/30	10.65.82.177 – 10.65.82.178	10.65.82.179
46	10.65.82.180/30	10.65.82.181 – 10.65.82.182	10.65.82.183
47	10.65.82.184/30	10.65.82.185 – 10.65.82.186	10.65.82.187
48	10.65.82.188/30	10.65.82.189 – 10.65.82.190	10.65.82.191
49	10.65.82.192/30	10.65.82.193 – 10.65.82.194	10.65.82.195
50	10.65.82.196/30	10.65.82.197 – 10.65.82.198	10.65.82.199
51	10.65.82.200/30	10.65.82.201 – 10.65.82.202	10.65.82.203
52	10.65.82.204/30	10.65.82.205 – 10.65.82.206	10.65.82.207
53	10.65.82.208/30	10.65.82.209 – 10.65.82.210	10.65.82.211
54	10.65.82.212/30	10.65.82.213 – 10.65.82.214	10.65.82.215
55	10.65.82.216/30	10.65.82.217 – 10.65.82.218	10.65.82.219
56	10.65.82.220/30	10.65.82.221 – 10.65.82.222	10.65.82.223
57	10.65.82.224/30	10.65.82.225 – 10.65.82.226	10.65.82.227
58	10.65.82.228/30	10.65.82.229 – 10.65.82.230	10.65.82.231
59	10.65.82.232/30	10.65.82.233 – 10.65.82.234	10.65.82.235
60	10.65.82.236/30	10.65.82.237 – 10.65.82.238	10.65.82.239
61	10.65.82.240/30	10.65.82.241 – 10.65.82.242	10.65.82.243
62	10.65.82.244/30	10.65.82.245 – 10.65.82.246	10.65.82.247
63	10.65.82.248/30	10.65.82.249 – 10.65.82.250	10.65.82.251
64	10.65.82.252/30	10.65.82.253 – 10.65.82.254	10.65.82.255
65	10.65.83.0/30	10.65.83.1 – 10.65.83.2	10.65.83.3
66	10.65.83.4/30	10.65.83.5 – 10.65.83.6	10.65.83.7
67	10.65.83.8/30	10.65.83.9 – 10.65.83.10	10.65.83.11
68	10.65.83.12/30	10.65.83.13 – 10.65.83.14	10.65.83.15
69	10.65.83.16/30	10.65.83.17 – 10.65.83.18	10.65.83.19
70	10.65.83.20/30	10.65.83.21 – 10.65.83.22	10.65.83.23
71	10.65.83.24/30	10.65.83.25 – 10.65.83.26	10.65.83.27
72	10.65.83.28/30	10.65.83.29 – 10.65.83.30	10.65.83.31
73	10.65.83.32/30	10.65.83.33 – 10.65.83.34	10.65.83.35
74	10.65.83.36/30	10.65.83.37 – 10.65.83.38	10.65.83.39
75	10.65.83.40/30	10.65.83.41 – 10.65.83.42	10.65.83.43
76	10.65.83.44/30	10.65.83.45 – 10.65.83.46	10.65.83.47
77	10.65.83.48/30	10.65.83.49 – 10.65.83.50	10.65.83.51
78	10.65.83.52/30	10.65.83.53 – 10.65.83.54	10.65.83.55
79	10.65.83.56/30	10.65.83.57 – 10.65.83.58	10.65.83.59
80	10.65.83.60/30	10.65.83.61 – 10.65.83.62	10.65.83.63
81	10.65.83.64/30	10.65.83.65 – 10.65.83.66	10.65.83.67
82	10.65.83.68/30	10.65.83.69 – 10.65.83.70	10.65.83.71
83	10.65.83.72/30	10.65.83.73 – 10.65.83.74	10.65.83.75
84	10.65.83.76/30	10.65.83.77 – 10.65.83.78	10.65.83.79
85	10.65.83.80/30	10.65.83.81 – 10.65.83.82	10.65.83.83
86	10.65.83.84/30	10.65.83.85 – 10.65.83.86	10.65.83.87
87	10.65.83.88/30	10.65.83.89 – 10.65.83.90	10.65.83.91
88	10.65.83.92/30	10.65.83.93 – 10.65.83.94	10.65.83.95
89	10.65.83.96/30	10.65.83.97 – 10.65.83.98	10.65.83.99
90	10.65.83.100/30	10.65.83.101 – 10.65.83.102	10.65.83.103
91	10.65.83.104/30	10.65.83.105 – 10.65.83.106	10.65.83.107
92	10.65.83.108/30	10.65.83.109 – 10.65.83.110	10.65.83.111
93	10.65.83.112/30	10.65.83.113 – 10.65.83.114	10.65.83.115
94	10.65.83.116/30	10.65.83.117 – 10.65.83.118	10.65.83.119
95	10.65.83.120/30	10.65.83.121 – 10.65.83.122	10.65.83.123
96	10.65.83.124/30	10.65.83.125 – 10.65.83.126	10.65.83.127
97	10.65.83.128/30	10.65.83.129 – 10.65.83.130	10.65.83.131
98	10.65.83.132/30	10.65.83.133 – 10.65.83.134	10.65.83.135
99	10.65.83.136/30	10.65.83.137 – 10.65.83.138	10.65.83.139
100	10.65.83.140/30	10.65.83.141 – 10.65.83.142	10.65.83.143
101	10.65.83.144/30	10.65.83.145 – 10.65.83.146	10.65.83.147
102	10.65.83.148/30	10.65.83.149 – 10.65.83.150	10.65.83.151
103	10.65.83.152/30	10.65.83.153 – 10.65.83.154	10.65.83.155
104	10.65.83.156/30	10.65.83.157 – 10.65.83.158	10.65.83.159
105	10.65.83.160/30	10.65.83.161 – 10.65.83.162	10.65.83.163
106	10.65.83.164/30	10.65.83.165 – 10.65.83.166	10.65.83.167
107	10.65.83.168/30	10.65.83.169 – 10.65.83.170	10.65.83.171
108	10.65.83.172/30	10.65.83.173 – 10.65.83.174	10.65.83.175
109	10.65.83.176/30	10.65.83.177 – 10.65.83.178	10.65.83.179
110	10.65.83.180/30	10.65.83.181 – 10.65.83.182	10.65.83.183
111	10.65.83.184/30	10.65.83.185 – 10.65.83.186	10.65.83.187
112	10.65.83.188/30	10.65.83.189 – 10.65.83.190	10.65.83.191
113	10.65.83.192/30	10.65.83.193 – 10.65.83.194	10.65.83.195
114	10.65.83.196/30	10.65.83.197 – 10.65.83.198	10.65.83.199
115	10.65.83.200/30	10.65.83.201 – 10.65.83.202	10.65.83.203
116	10.65.83.204/30	10.65.83.205 – 10.65.83.206	10.65.83.207
117	10.65.83.208/30	10.65.83.209 – 10.65.83.210	10.65.83.211
118	10.65.83.212/30	10.65.83.213 – 10.65.83.214	10.65.83.215
119	10.65.83.216/30	10.65.83.217 – 10.65.83.218	10.65.83.219
120	10.65.83.220/30	10.65.83.221 – 10.65.83.222	10.65.83.223
121	10.65.83.224/30	10.65.83.225 – 10.65.83.226	10.65.83.227
122	10.65.83.228/30	10.65.83.229 – 10.65.83.230	10.65.83.231
123	10.65.83.232/30	10.65.83.233 – 10.65.83.234	10.65.83.235
124	10.65.83.236/30	10.65.83.237 – 10.65.83.238	10.65.83.239
125	10.65.83.240/30	10.65.83.241 – 10.65.83.242	10.65.83.243
126	10.65.83.244/30	10.65.83.245 – 10.65.83.246	10.65.83.247
127	10.65.83.248/30	10.65.83.249 – 10.65.83.250	10.65.83.251
128	10.65.83.252/30	10.65.83.253 – 10.65.83.254	10.65.83.255

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 /23
/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	-
/23	255.255.254.0	512	510	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →