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)10.0.64.0/23

network10.0.64.0/23

broadcast10.0.65.255

first host10.0.64.1

last host10.0.65.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.64.0/23

address00001010.00000000.01000000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.01000000.00000000

broadcast00001010.00000000.01000001.11111111

green = network part, grey = host part

hex0x0a004000

decimal167788544

reverse dns0.64.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:4000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.64.0/30	10.0.64.1 – 10.0.64.2	10.0.64.3
2	10.0.64.4/30	10.0.64.5 – 10.0.64.6	10.0.64.7
3	10.0.64.8/30	10.0.64.9 – 10.0.64.10	10.0.64.11
4	10.0.64.12/30	10.0.64.13 – 10.0.64.14	10.0.64.15
5	10.0.64.16/30	10.0.64.17 – 10.0.64.18	10.0.64.19
6	10.0.64.20/30	10.0.64.21 – 10.0.64.22	10.0.64.23
7	10.0.64.24/30	10.0.64.25 – 10.0.64.26	10.0.64.27
8	10.0.64.28/30	10.0.64.29 – 10.0.64.30	10.0.64.31
9	10.0.64.32/30	10.0.64.33 – 10.0.64.34	10.0.64.35
10	10.0.64.36/30	10.0.64.37 – 10.0.64.38	10.0.64.39
11	10.0.64.40/30	10.0.64.41 – 10.0.64.42	10.0.64.43
12	10.0.64.44/30	10.0.64.45 – 10.0.64.46	10.0.64.47
13	10.0.64.48/30	10.0.64.49 – 10.0.64.50	10.0.64.51
14	10.0.64.52/30	10.0.64.53 – 10.0.64.54	10.0.64.55
15	10.0.64.56/30	10.0.64.57 – 10.0.64.58	10.0.64.59
16	10.0.64.60/30	10.0.64.61 – 10.0.64.62	10.0.64.63
17	10.0.64.64/30	10.0.64.65 – 10.0.64.66	10.0.64.67
18	10.0.64.68/30	10.0.64.69 – 10.0.64.70	10.0.64.71
19	10.0.64.72/30	10.0.64.73 – 10.0.64.74	10.0.64.75
20	10.0.64.76/30	10.0.64.77 – 10.0.64.78	10.0.64.79
21	10.0.64.80/30	10.0.64.81 – 10.0.64.82	10.0.64.83
22	10.0.64.84/30	10.0.64.85 – 10.0.64.86	10.0.64.87
23	10.0.64.88/30	10.0.64.89 – 10.0.64.90	10.0.64.91
24	10.0.64.92/30	10.0.64.93 – 10.0.64.94	10.0.64.95
25	10.0.64.96/30	10.0.64.97 – 10.0.64.98	10.0.64.99
26	10.0.64.100/30	10.0.64.101 – 10.0.64.102	10.0.64.103
27	10.0.64.104/30	10.0.64.105 – 10.0.64.106	10.0.64.107
28	10.0.64.108/30	10.0.64.109 – 10.0.64.110	10.0.64.111
29	10.0.64.112/30	10.0.64.113 – 10.0.64.114	10.0.64.115
30	10.0.64.116/30	10.0.64.117 – 10.0.64.118	10.0.64.119
31	10.0.64.120/30	10.0.64.121 – 10.0.64.122	10.0.64.123
32	10.0.64.124/30	10.0.64.125 – 10.0.64.126	10.0.64.127
33	10.0.64.128/30	10.0.64.129 – 10.0.64.130	10.0.64.131
34	10.0.64.132/30	10.0.64.133 – 10.0.64.134	10.0.64.135
35	10.0.64.136/30	10.0.64.137 – 10.0.64.138	10.0.64.139
36	10.0.64.140/30	10.0.64.141 – 10.0.64.142	10.0.64.143
37	10.0.64.144/30	10.0.64.145 – 10.0.64.146	10.0.64.147
38	10.0.64.148/30	10.0.64.149 – 10.0.64.150	10.0.64.151
39	10.0.64.152/30	10.0.64.153 – 10.0.64.154	10.0.64.155
40	10.0.64.156/30	10.0.64.157 – 10.0.64.158	10.0.64.159
41	10.0.64.160/30	10.0.64.161 – 10.0.64.162	10.0.64.163
42	10.0.64.164/30	10.0.64.165 – 10.0.64.166	10.0.64.167
43	10.0.64.168/30	10.0.64.169 – 10.0.64.170	10.0.64.171
44	10.0.64.172/30	10.0.64.173 – 10.0.64.174	10.0.64.175
45	10.0.64.176/30	10.0.64.177 – 10.0.64.178	10.0.64.179
46	10.0.64.180/30	10.0.64.181 – 10.0.64.182	10.0.64.183
47	10.0.64.184/30	10.0.64.185 – 10.0.64.186	10.0.64.187
48	10.0.64.188/30	10.0.64.189 – 10.0.64.190	10.0.64.191
49	10.0.64.192/30	10.0.64.193 – 10.0.64.194	10.0.64.195
50	10.0.64.196/30	10.0.64.197 – 10.0.64.198	10.0.64.199
51	10.0.64.200/30	10.0.64.201 – 10.0.64.202	10.0.64.203
52	10.0.64.204/30	10.0.64.205 – 10.0.64.206	10.0.64.207
53	10.0.64.208/30	10.0.64.209 – 10.0.64.210	10.0.64.211
54	10.0.64.212/30	10.0.64.213 – 10.0.64.214	10.0.64.215
55	10.0.64.216/30	10.0.64.217 – 10.0.64.218	10.0.64.219
56	10.0.64.220/30	10.0.64.221 – 10.0.64.222	10.0.64.223
57	10.0.64.224/30	10.0.64.225 – 10.0.64.226	10.0.64.227
58	10.0.64.228/30	10.0.64.229 – 10.0.64.230	10.0.64.231
59	10.0.64.232/30	10.0.64.233 – 10.0.64.234	10.0.64.235
60	10.0.64.236/30	10.0.64.237 – 10.0.64.238	10.0.64.239
61	10.0.64.240/30	10.0.64.241 – 10.0.64.242	10.0.64.243
62	10.0.64.244/30	10.0.64.245 – 10.0.64.246	10.0.64.247
63	10.0.64.248/30	10.0.64.249 – 10.0.64.250	10.0.64.251
64	10.0.64.252/30	10.0.64.253 – 10.0.64.254	10.0.64.255
65	10.0.65.0/30	10.0.65.1 – 10.0.65.2	10.0.65.3
66	10.0.65.4/30	10.0.65.5 – 10.0.65.6	10.0.65.7
67	10.0.65.8/30	10.0.65.9 – 10.0.65.10	10.0.65.11
68	10.0.65.12/30	10.0.65.13 – 10.0.65.14	10.0.65.15
69	10.0.65.16/30	10.0.65.17 – 10.0.65.18	10.0.65.19
70	10.0.65.20/30	10.0.65.21 – 10.0.65.22	10.0.65.23
71	10.0.65.24/30	10.0.65.25 – 10.0.65.26	10.0.65.27
72	10.0.65.28/30	10.0.65.29 – 10.0.65.30	10.0.65.31
73	10.0.65.32/30	10.0.65.33 – 10.0.65.34	10.0.65.35
74	10.0.65.36/30	10.0.65.37 – 10.0.65.38	10.0.65.39
75	10.0.65.40/30	10.0.65.41 – 10.0.65.42	10.0.65.43
76	10.0.65.44/30	10.0.65.45 – 10.0.65.46	10.0.65.47
77	10.0.65.48/30	10.0.65.49 – 10.0.65.50	10.0.65.51
78	10.0.65.52/30	10.0.65.53 – 10.0.65.54	10.0.65.55
79	10.0.65.56/30	10.0.65.57 – 10.0.65.58	10.0.65.59
80	10.0.65.60/30	10.0.65.61 – 10.0.65.62	10.0.65.63
81	10.0.65.64/30	10.0.65.65 – 10.0.65.66	10.0.65.67
82	10.0.65.68/30	10.0.65.69 – 10.0.65.70	10.0.65.71
83	10.0.65.72/30	10.0.65.73 – 10.0.65.74	10.0.65.75
84	10.0.65.76/30	10.0.65.77 – 10.0.65.78	10.0.65.79
85	10.0.65.80/30	10.0.65.81 – 10.0.65.82	10.0.65.83
86	10.0.65.84/30	10.0.65.85 – 10.0.65.86	10.0.65.87
87	10.0.65.88/30	10.0.65.89 – 10.0.65.90	10.0.65.91
88	10.0.65.92/30	10.0.65.93 – 10.0.65.94	10.0.65.95
89	10.0.65.96/30	10.0.65.97 – 10.0.65.98	10.0.65.99
90	10.0.65.100/30	10.0.65.101 – 10.0.65.102	10.0.65.103
91	10.0.65.104/30	10.0.65.105 – 10.0.65.106	10.0.65.107
92	10.0.65.108/30	10.0.65.109 – 10.0.65.110	10.0.65.111
93	10.0.65.112/30	10.0.65.113 – 10.0.65.114	10.0.65.115
94	10.0.65.116/30	10.0.65.117 – 10.0.65.118	10.0.65.119
95	10.0.65.120/30	10.0.65.121 – 10.0.65.122	10.0.65.123
96	10.0.65.124/30	10.0.65.125 – 10.0.65.126	10.0.65.127
97	10.0.65.128/30	10.0.65.129 – 10.0.65.130	10.0.65.131
98	10.0.65.132/30	10.0.65.133 – 10.0.65.134	10.0.65.135
99	10.0.65.136/30	10.0.65.137 – 10.0.65.138	10.0.65.139
100	10.0.65.140/30	10.0.65.141 – 10.0.65.142	10.0.65.143
101	10.0.65.144/30	10.0.65.145 – 10.0.65.146	10.0.65.147
102	10.0.65.148/30	10.0.65.149 – 10.0.65.150	10.0.65.151
103	10.0.65.152/30	10.0.65.153 – 10.0.65.154	10.0.65.155
104	10.0.65.156/30	10.0.65.157 – 10.0.65.158	10.0.65.159
105	10.0.65.160/30	10.0.65.161 – 10.0.65.162	10.0.65.163
106	10.0.65.164/30	10.0.65.165 – 10.0.65.166	10.0.65.167
107	10.0.65.168/30	10.0.65.169 – 10.0.65.170	10.0.65.171
108	10.0.65.172/30	10.0.65.173 – 10.0.65.174	10.0.65.175
109	10.0.65.176/30	10.0.65.177 – 10.0.65.178	10.0.65.179
110	10.0.65.180/30	10.0.65.181 – 10.0.65.182	10.0.65.183
111	10.0.65.184/30	10.0.65.185 – 10.0.65.186	10.0.65.187
112	10.0.65.188/30	10.0.65.189 – 10.0.65.190	10.0.65.191
113	10.0.65.192/30	10.0.65.193 – 10.0.65.194	10.0.65.195
114	10.0.65.196/30	10.0.65.197 – 10.0.65.198	10.0.65.199
115	10.0.65.200/30	10.0.65.201 – 10.0.65.202	10.0.65.203
116	10.0.65.204/30	10.0.65.205 – 10.0.65.206	10.0.65.207
117	10.0.65.208/30	10.0.65.209 – 10.0.65.210	10.0.65.211
118	10.0.65.212/30	10.0.65.213 – 10.0.65.214	10.0.65.215
119	10.0.65.216/30	10.0.65.217 – 10.0.65.218	10.0.65.219
120	10.0.65.220/30	10.0.65.221 – 10.0.65.222	10.0.65.223
121	10.0.65.224/30	10.0.65.225 – 10.0.65.226	10.0.65.227
122	10.0.65.228/30	10.0.65.229 – 10.0.65.230	10.0.65.231
123	10.0.65.232/30	10.0.65.233 – 10.0.65.234	10.0.65.235
124	10.0.65.236/30	10.0.65.237 – 10.0.65.238	10.0.65.239
125	10.0.65.240/30	10.0.65.241 – 10.0.65.242	10.0.65.243
126	10.0.65.244/30	10.0.65.245 – 10.0.65.246	10.0.65.247
127	10.0.65.248/30	10.0.65.249 – 10.0.65.250	10.0.65.251
128	10.0.65.252/30	10.0.65.253 – 10.0.65.254	10.0.65.255

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 →