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)10.65.32.0/23

network10.65.32.0/23

broadcast10.65.33.255

first host10.65.32.1

last host10.65.33.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.65.32.0/23

address00001010.01000001.00100000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000001.00100000.00000000

broadcast00001010.01000001.00100001.11111111

green = network part, grey = host part

hex0x0a412000

decimal172040192

reverse dns0.32.65.10.in-addr.arpa

ipv4-mapped::ffff:a41:2000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.65.32.0/30	10.65.32.1 – 10.65.32.2	10.65.32.3
2	10.65.32.4/30	10.65.32.5 – 10.65.32.6	10.65.32.7
3	10.65.32.8/30	10.65.32.9 – 10.65.32.10	10.65.32.11
4	10.65.32.12/30	10.65.32.13 – 10.65.32.14	10.65.32.15
5	10.65.32.16/30	10.65.32.17 – 10.65.32.18	10.65.32.19
6	10.65.32.20/30	10.65.32.21 – 10.65.32.22	10.65.32.23
7	10.65.32.24/30	10.65.32.25 – 10.65.32.26	10.65.32.27
8	10.65.32.28/30	10.65.32.29 – 10.65.32.30	10.65.32.31
9	10.65.32.32/30	10.65.32.33 – 10.65.32.34	10.65.32.35
10	10.65.32.36/30	10.65.32.37 – 10.65.32.38	10.65.32.39
11	10.65.32.40/30	10.65.32.41 – 10.65.32.42	10.65.32.43
12	10.65.32.44/30	10.65.32.45 – 10.65.32.46	10.65.32.47
13	10.65.32.48/30	10.65.32.49 – 10.65.32.50	10.65.32.51
14	10.65.32.52/30	10.65.32.53 – 10.65.32.54	10.65.32.55
15	10.65.32.56/30	10.65.32.57 – 10.65.32.58	10.65.32.59
16	10.65.32.60/30	10.65.32.61 – 10.65.32.62	10.65.32.63
17	10.65.32.64/30	10.65.32.65 – 10.65.32.66	10.65.32.67
18	10.65.32.68/30	10.65.32.69 – 10.65.32.70	10.65.32.71
19	10.65.32.72/30	10.65.32.73 – 10.65.32.74	10.65.32.75
20	10.65.32.76/30	10.65.32.77 – 10.65.32.78	10.65.32.79
21	10.65.32.80/30	10.65.32.81 – 10.65.32.82	10.65.32.83
22	10.65.32.84/30	10.65.32.85 – 10.65.32.86	10.65.32.87
23	10.65.32.88/30	10.65.32.89 – 10.65.32.90	10.65.32.91
24	10.65.32.92/30	10.65.32.93 – 10.65.32.94	10.65.32.95
25	10.65.32.96/30	10.65.32.97 – 10.65.32.98	10.65.32.99
26	10.65.32.100/30	10.65.32.101 – 10.65.32.102	10.65.32.103
27	10.65.32.104/30	10.65.32.105 – 10.65.32.106	10.65.32.107
28	10.65.32.108/30	10.65.32.109 – 10.65.32.110	10.65.32.111
29	10.65.32.112/30	10.65.32.113 – 10.65.32.114	10.65.32.115
30	10.65.32.116/30	10.65.32.117 – 10.65.32.118	10.65.32.119
31	10.65.32.120/30	10.65.32.121 – 10.65.32.122	10.65.32.123
32	10.65.32.124/30	10.65.32.125 – 10.65.32.126	10.65.32.127
33	10.65.32.128/30	10.65.32.129 – 10.65.32.130	10.65.32.131
34	10.65.32.132/30	10.65.32.133 – 10.65.32.134	10.65.32.135
35	10.65.32.136/30	10.65.32.137 – 10.65.32.138	10.65.32.139
36	10.65.32.140/30	10.65.32.141 – 10.65.32.142	10.65.32.143
37	10.65.32.144/30	10.65.32.145 – 10.65.32.146	10.65.32.147
38	10.65.32.148/30	10.65.32.149 – 10.65.32.150	10.65.32.151
39	10.65.32.152/30	10.65.32.153 – 10.65.32.154	10.65.32.155
40	10.65.32.156/30	10.65.32.157 – 10.65.32.158	10.65.32.159
41	10.65.32.160/30	10.65.32.161 – 10.65.32.162	10.65.32.163
42	10.65.32.164/30	10.65.32.165 – 10.65.32.166	10.65.32.167
43	10.65.32.168/30	10.65.32.169 – 10.65.32.170	10.65.32.171
44	10.65.32.172/30	10.65.32.173 – 10.65.32.174	10.65.32.175
45	10.65.32.176/30	10.65.32.177 – 10.65.32.178	10.65.32.179
46	10.65.32.180/30	10.65.32.181 – 10.65.32.182	10.65.32.183
47	10.65.32.184/30	10.65.32.185 – 10.65.32.186	10.65.32.187
48	10.65.32.188/30	10.65.32.189 – 10.65.32.190	10.65.32.191
49	10.65.32.192/30	10.65.32.193 – 10.65.32.194	10.65.32.195
50	10.65.32.196/30	10.65.32.197 – 10.65.32.198	10.65.32.199
51	10.65.32.200/30	10.65.32.201 – 10.65.32.202	10.65.32.203
52	10.65.32.204/30	10.65.32.205 – 10.65.32.206	10.65.32.207
53	10.65.32.208/30	10.65.32.209 – 10.65.32.210	10.65.32.211
54	10.65.32.212/30	10.65.32.213 – 10.65.32.214	10.65.32.215
55	10.65.32.216/30	10.65.32.217 – 10.65.32.218	10.65.32.219
56	10.65.32.220/30	10.65.32.221 – 10.65.32.222	10.65.32.223
57	10.65.32.224/30	10.65.32.225 – 10.65.32.226	10.65.32.227
58	10.65.32.228/30	10.65.32.229 – 10.65.32.230	10.65.32.231
59	10.65.32.232/30	10.65.32.233 – 10.65.32.234	10.65.32.235
60	10.65.32.236/30	10.65.32.237 – 10.65.32.238	10.65.32.239
61	10.65.32.240/30	10.65.32.241 – 10.65.32.242	10.65.32.243
62	10.65.32.244/30	10.65.32.245 – 10.65.32.246	10.65.32.247
63	10.65.32.248/30	10.65.32.249 – 10.65.32.250	10.65.32.251
64	10.65.32.252/30	10.65.32.253 – 10.65.32.254	10.65.32.255
65	10.65.33.0/30	10.65.33.1 – 10.65.33.2	10.65.33.3
66	10.65.33.4/30	10.65.33.5 – 10.65.33.6	10.65.33.7
67	10.65.33.8/30	10.65.33.9 – 10.65.33.10	10.65.33.11
68	10.65.33.12/30	10.65.33.13 – 10.65.33.14	10.65.33.15
69	10.65.33.16/30	10.65.33.17 – 10.65.33.18	10.65.33.19
70	10.65.33.20/30	10.65.33.21 – 10.65.33.22	10.65.33.23
71	10.65.33.24/30	10.65.33.25 – 10.65.33.26	10.65.33.27
72	10.65.33.28/30	10.65.33.29 – 10.65.33.30	10.65.33.31
73	10.65.33.32/30	10.65.33.33 – 10.65.33.34	10.65.33.35
74	10.65.33.36/30	10.65.33.37 – 10.65.33.38	10.65.33.39
75	10.65.33.40/30	10.65.33.41 – 10.65.33.42	10.65.33.43
76	10.65.33.44/30	10.65.33.45 – 10.65.33.46	10.65.33.47
77	10.65.33.48/30	10.65.33.49 – 10.65.33.50	10.65.33.51
78	10.65.33.52/30	10.65.33.53 – 10.65.33.54	10.65.33.55
79	10.65.33.56/30	10.65.33.57 – 10.65.33.58	10.65.33.59
80	10.65.33.60/30	10.65.33.61 – 10.65.33.62	10.65.33.63
81	10.65.33.64/30	10.65.33.65 – 10.65.33.66	10.65.33.67
82	10.65.33.68/30	10.65.33.69 – 10.65.33.70	10.65.33.71
83	10.65.33.72/30	10.65.33.73 – 10.65.33.74	10.65.33.75
84	10.65.33.76/30	10.65.33.77 – 10.65.33.78	10.65.33.79
85	10.65.33.80/30	10.65.33.81 – 10.65.33.82	10.65.33.83
86	10.65.33.84/30	10.65.33.85 – 10.65.33.86	10.65.33.87
87	10.65.33.88/30	10.65.33.89 – 10.65.33.90	10.65.33.91
88	10.65.33.92/30	10.65.33.93 – 10.65.33.94	10.65.33.95
89	10.65.33.96/30	10.65.33.97 – 10.65.33.98	10.65.33.99
90	10.65.33.100/30	10.65.33.101 – 10.65.33.102	10.65.33.103
91	10.65.33.104/30	10.65.33.105 – 10.65.33.106	10.65.33.107
92	10.65.33.108/30	10.65.33.109 – 10.65.33.110	10.65.33.111
93	10.65.33.112/30	10.65.33.113 – 10.65.33.114	10.65.33.115
94	10.65.33.116/30	10.65.33.117 – 10.65.33.118	10.65.33.119
95	10.65.33.120/30	10.65.33.121 – 10.65.33.122	10.65.33.123
96	10.65.33.124/30	10.65.33.125 – 10.65.33.126	10.65.33.127
97	10.65.33.128/30	10.65.33.129 – 10.65.33.130	10.65.33.131
98	10.65.33.132/30	10.65.33.133 – 10.65.33.134	10.65.33.135
99	10.65.33.136/30	10.65.33.137 – 10.65.33.138	10.65.33.139
100	10.65.33.140/30	10.65.33.141 – 10.65.33.142	10.65.33.143
101	10.65.33.144/30	10.65.33.145 – 10.65.33.146	10.65.33.147
102	10.65.33.148/30	10.65.33.149 – 10.65.33.150	10.65.33.151
103	10.65.33.152/30	10.65.33.153 – 10.65.33.154	10.65.33.155
104	10.65.33.156/30	10.65.33.157 – 10.65.33.158	10.65.33.159
105	10.65.33.160/30	10.65.33.161 – 10.65.33.162	10.65.33.163
106	10.65.33.164/30	10.65.33.165 – 10.65.33.166	10.65.33.167
107	10.65.33.168/30	10.65.33.169 – 10.65.33.170	10.65.33.171
108	10.65.33.172/30	10.65.33.173 – 10.65.33.174	10.65.33.175
109	10.65.33.176/30	10.65.33.177 – 10.65.33.178	10.65.33.179
110	10.65.33.180/30	10.65.33.181 – 10.65.33.182	10.65.33.183
111	10.65.33.184/30	10.65.33.185 – 10.65.33.186	10.65.33.187
112	10.65.33.188/30	10.65.33.189 – 10.65.33.190	10.65.33.191
113	10.65.33.192/30	10.65.33.193 – 10.65.33.194	10.65.33.195
114	10.65.33.196/30	10.65.33.197 – 10.65.33.198	10.65.33.199
115	10.65.33.200/30	10.65.33.201 – 10.65.33.202	10.65.33.203
116	10.65.33.204/30	10.65.33.205 – 10.65.33.206	10.65.33.207
117	10.65.33.208/30	10.65.33.209 – 10.65.33.210	10.65.33.211
118	10.65.33.212/30	10.65.33.213 – 10.65.33.214	10.65.33.215
119	10.65.33.216/30	10.65.33.217 – 10.65.33.218	10.65.33.219
120	10.65.33.220/30	10.65.33.221 – 10.65.33.222	10.65.33.223
121	10.65.33.224/30	10.65.33.225 – 10.65.33.226	10.65.33.227
122	10.65.33.228/30	10.65.33.229 – 10.65.33.230	10.65.33.231
123	10.65.33.232/30	10.65.33.233 – 10.65.33.234	10.65.33.235
124	10.65.33.236/30	10.65.33.237 – 10.65.33.238	10.65.33.239
125	10.65.33.240/30	10.65.33.241 – 10.65.33.242	10.65.33.243
126	10.65.33.244/30	10.65.33.245 – 10.65.33.246	10.65.33.247
127	10.65.33.248/30	10.65.33.249 – 10.65.33.250	10.65.33.251
128	10.65.33.252/30	10.65.33.253 – 10.65.33.254	10.65.33.255

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 →