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)10.0.65.0/24

network10.0.65.0/24

broadcast10.0.65.255

first host10.0.65.1

last host10.0.65.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.65.0/24

address00001010.00000000.01000001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01000001.00000000

broadcast00001010.00000000.01000001.11111111

green = network part, grey = host part

hex0x0a004100

decimal167788800

reverse dns0.65.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:4100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.65.0/31	10.0.65.0 – 10.0.65.1	10.0.65.1
2	10.0.65.2/31	10.0.65.2 – 10.0.65.3	10.0.65.3
3	10.0.65.4/31	10.0.65.4 – 10.0.65.5	10.0.65.5
4	10.0.65.6/31	10.0.65.6 – 10.0.65.7	10.0.65.7
5	10.0.65.8/31	10.0.65.8 – 10.0.65.9	10.0.65.9
6	10.0.65.10/31	10.0.65.10 – 10.0.65.11	10.0.65.11
7	10.0.65.12/31	10.0.65.12 – 10.0.65.13	10.0.65.13
8	10.0.65.14/31	10.0.65.14 – 10.0.65.15	10.0.65.15
9	10.0.65.16/31	10.0.65.16 – 10.0.65.17	10.0.65.17
10	10.0.65.18/31	10.0.65.18 – 10.0.65.19	10.0.65.19
11	10.0.65.20/31	10.0.65.20 – 10.0.65.21	10.0.65.21
12	10.0.65.22/31	10.0.65.22 – 10.0.65.23	10.0.65.23
13	10.0.65.24/31	10.0.65.24 – 10.0.65.25	10.0.65.25
14	10.0.65.26/31	10.0.65.26 – 10.0.65.27	10.0.65.27
15	10.0.65.28/31	10.0.65.28 – 10.0.65.29	10.0.65.29
16	10.0.65.30/31	10.0.65.30 – 10.0.65.31	10.0.65.31
17	10.0.65.32/31	10.0.65.32 – 10.0.65.33	10.0.65.33
18	10.0.65.34/31	10.0.65.34 – 10.0.65.35	10.0.65.35
19	10.0.65.36/31	10.0.65.36 – 10.0.65.37	10.0.65.37
20	10.0.65.38/31	10.0.65.38 – 10.0.65.39	10.0.65.39
21	10.0.65.40/31	10.0.65.40 – 10.0.65.41	10.0.65.41
22	10.0.65.42/31	10.0.65.42 – 10.0.65.43	10.0.65.43
23	10.0.65.44/31	10.0.65.44 – 10.0.65.45	10.0.65.45
24	10.0.65.46/31	10.0.65.46 – 10.0.65.47	10.0.65.47
25	10.0.65.48/31	10.0.65.48 – 10.0.65.49	10.0.65.49
26	10.0.65.50/31	10.0.65.50 – 10.0.65.51	10.0.65.51
27	10.0.65.52/31	10.0.65.52 – 10.0.65.53	10.0.65.53
28	10.0.65.54/31	10.0.65.54 – 10.0.65.55	10.0.65.55
29	10.0.65.56/31	10.0.65.56 – 10.0.65.57	10.0.65.57
30	10.0.65.58/31	10.0.65.58 – 10.0.65.59	10.0.65.59
31	10.0.65.60/31	10.0.65.60 – 10.0.65.61	10.0.65.61
32	10.0.65.62/31	10.0.65.62 – 10.0.65.63	10.0.65.63
33	10.0.65.64/31	10.0.65.64 – 10.0.65.65	10.0.65.65
34	10.0.65.66/31	10.0.65.66 – 10.0.65.67	10.0.65.67
35	10.0.65.68/31	10.0.65.68 – 10.0.65.69	10.0.65.69
36	10.0.65.70/31	10.0.65.70 – 10.0.65.71	10.0.65.71
37	10.0.65.72/31	10.0.65.72 – 10.0.65.73	10.0.65.73
38	10.0.65.74/31	10.0.65.74 – 10.0.65.75	10.0.65.75
39	10.0.65.76/31	10.0.65.76 – 10.0.65.77	10.0.65.77
40	10.0.65.78/31	10.0.65.78 – 10.0.65.79	10.0.65.79
41	10.0.65.80/31	10.0.65.80 – 10.0.65.81	10.0.65.81
42	10.0.65.82/31	10.0.65.82 – 10.0.65.83	10.0.65.83
43	10.0.65.84/31	10.0.65.84 – 10.0.65.85	10.0.65.85
44	10.0.65.86/31	10.0.65.86 – 10.0.65.87	10.0.65.87
45	10.0.65.88/31	10.0.65.88 – 10.0.65.89	10.0.65.89
46	10.0.65.90/31	10.0.65.90 – 10.0.65.91	10.0.65.91
47	10.0.65.92/31	10.0.65.92 – 10.0.65.93	10.0.65.93
48	10.0.65.94/31	10.0.65.94 – 10.0.65.95	10.0.65.95
49	10.0.65.96/31	10.0.65.96 – 10.0.65.97	10.0.65.97
50	10.0.65.98/31	10.0.65.98 – 10.0.65.99	10.0.65.99
51	10.0.65.100/31	10.0.65.100 – 10.0.65.101	10.0.65.101
52	10.0.65.102/31	10.0.65.102 – 10.0.65.103	10.0.65.103
53	10.0.65.104/31	10.0.65.104 – 10.0.65.105	10.0.65.105
54	10.0.65.106/31	10.0.65.106 – 10.0.65.107	10.0.65.107
55	10.0.65.108/31	10.0.65.108 – 10.0.65.109	10.0.65.109
56	10.0.65.110/31	10.0.65.110 – 10.0.65.111	10.0.65.111
57	10.0.65.112/31	10.0.65.112 – 10.0.65.113	10.0.65.113
58	10.0.65.114/31	10.0.65.114 – 10.0.65.115	10.0.65.115
59	10.0.65.116/31	10.0.65.116 – 10.0.65.117	10.0.65.117
60	10.0.65.118/31	10.0.65.118 – 10.0.65.119	10.0.65.119
61	10.0.65.120/31	10.0.65.120 – 10.0.65.121	10.0.65.121
62	10.0.65.122/31	10.0.65.122 – 10.0.65.123	10.0.65.123
63	10.0.65.124/31	10.0.65.124 – 10.0.65.125	10.0.65.125
64	10.0.65.126/31	10.0.65.126 – 10.0.65.127	10.0.65.127
65	10.0.65.128/31	10.0.65.128 – 10.0.65.129	10.0.65.129
66	10.0.65.130/31	10.0.65.130 – 10.0.65.131	10.0.65.131
67	10.0.65.132/31	10.0.65.132 – 10.0.65.133	10.0.65.133
68	10.0.65.134/31	10.0.65.134 – 10.0.65.135	10.0.65.135
69	10.0.65.136/31	10.0.65.136 – 10.0.65.137	10.0.65.137
70	10.0.65.138/31	10.0.65.138 – 10.0.65.139	10.0.65.139
71	10.0.65.140/31	10.0.65.140 – 10.0.65.141	10.0.65.141
72	10.0.65.142/31	10.0.65.142 – 10.0.65.143	10.0.65.143
73	10.0.65.144/31	10.0.65.144 – 10.0.65.145	10.0.65.145
74	10.0.65.146/31	10.0.65.146 – 10.0.65.147	10.0.65.147
75	10.0.65.148/31	10.0.65.148 – 10.0.65.149	10.0.65.149
76	10.0.65.150/31	10.0.65.150 – 10.0.65.151	10.0.65.151
77	10.0.65.152/31	10.0.65.152 – 10.0.65.153	10.0.65.153
78	10.0.65.154/31	10.0.65.154 – 10.0.65.155	10.0.65.155
79	10.0.65.156/31	10.0.65.156 – 10.0.65.157	10.0.65.157
80	10.0.65.158/31	10.0.65.158 – 10.0.65.159	10.0.65.159
81	10.0.65.160/31	10.0.65.160 – 10.0.65.161	10.0.65.161
82	10.0.65.162/31	10.0.65.162 – 10.0.65.163	10.0.65.163
83	10.0.65.164/31	10.0.65.164 – 10.0.65.165	10.0.65.165
84	10.0.65.166/31	10.0.65.166 – 10.0.65.167	10.0.65.167
85	10.0.65.168/31	10.0.65.168 – 10.0.65.169	10.0.65.169
86	10.0.65.170/31	10.0.65.170 – 10.0.65.171	10.0.65.171
87	10.0.65.172/31	10.0.65.172 – 10.0.65.173	10.0.65.173
88	10.0.65.174/31	10.0.65.174 – 10.0.65.175	10.0.65.175
89	10.0.65.176/31	10.0.65.176 – 10.0.65.177	10.0.65.177
90	10.0.65.178/31	10.0.65.178 – 10.0.65.179	10.0.65.179
91	10.0.65.180/31	10.0.65.180 – 10.0.65.181	10.0.65.181
92	10.0.65.182/31	10.0.65.182 – 10.0.65.183	10.0.65.183
93	10.0.65.184/31	10.0.65.184 – 10.0.65.185	10.0.65.185
94	10.0.65.186/31	10.0.65.186 – 10.0.65.187	10.0.65.187
95	10.0.65.188/31	10.0.65.188 – 10.0.65.189	10.0.65.189
96	10.0.65.190/31	10.0.65.190 – 10.0.65.191	10.0.65.191
97	10.0.65.192/31	10.0.65.192 – 10.0.65.193	10.0.65.193
98	10.0.65.194/31	10.0.65.194 – 10.0.65.195	10.0.65.195
99	10.0.65.196/31	10.0.65.196 – 10.0.65.197	10.0.65.197
100	10.0.65.198/31	10.0.65.198 – 10.0.65.199	10.0.65.199
101	10.0.65.200/31	10.0.65.200 – 10.0.65.201	10.0.65.201
102	10.0.65.202/31	10.0.65.202 – 10.0.65.203	10.0.65.203
103	10.0.65.204/31	10.0.65.204 – 10.0.65.205	10.0.65.205
104	10.0.65.206/31	10.0.65.206 – 10.0.65.207	10.0.65.207
105	10.0.65.208/31	10.0.65.208 – 10.0.65.209	10.0.65.209
106	10.0.65.210/31	10.0.65.210 – 10.0.65.211	10.0.65.211
107	10.0.65.212/31	10.0.65.212 – 10.0.65.213	10.0.65.213
108	10.0.65.214/31	10.0.65.214 – 10.0.65.215	10.0.65.215
109	10.0.65.216/31	10.0.65.216 – 10.0.65.217	10.0.65.217
110	10.0.65.218/31	10.0.65.218 – 10.0.65.219	10.0.65.219
111	10.0.65.220/31	10.0.65.220 – 10.0.65.221	10.0.65.221
112	10.0.65.222/31	10.0.65.222 – 10.0.65.223	10.0.65.223
113	10.0.65.224/31	10.0.65.224 – 10.0.65.225	10.0.65.225
114	10.0.65.226/31	10.0.65.226 – 10.0.65.227	10.0.65.227
115	10.0.65.228/31	10.0.65.228 – 10.0.65.229	10.0.65.229
116	10.0.65.230/31	10.0.65.230 – 10.0.65.231	10.0.65.231
117	10.0.65.232/31	10.0.65.232 – 10.0.65.233	10.0.65.233
118	10.0.65.234/31	10.0.65.234 – 10.0.65.235	10.0.65.235
119	10.0.65.236/31	10.0.65.236 – 10.0.65.237	10.0.65.237
120	10.0.65.238/31	10.0.65.238 – 10.0.65.239	10.0.65.239
121	10.0.65.240/31	10.0.65.240 – 10.0.65.241	10.0.65.241
122	10.0.65.242/31	10.0.65.242 – 10.0.65.243	10.0.65.243
123	10.0.65.244/31	10.0.65.244 – 10.0.65.245	10.0.65.245
124	10.0.65.246/31	10.0.65.246 – 10.0.65.247	10.0.65.247
125	10.0.65.248/31	10.0.65.248 – 10.0.65.249	10.0.65.249
126	10.0.65.250/31	10.0.65.250 – 10.0.65.251	10.0.65.251
127	10.0.65.252/31	10.0.65.252 – 10.0.65.253	10.0.65.253
128	10.0.65.254/31	10.0.65.254 – 10.0.65.255	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 /24
/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	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →