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)172.16.9.0/24

network172.16.9.0/24

broadcast172.16.9.255

first host172.16.9.1

last host172.16.9.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classB

ipcalc 172.16.9.0/24

address10101100.00010000.00001001.00000000

subnet mask11111111.11111111.11111111.00000000

network10101100.00010000.00001001.00000000

broadcast10101100.00010000.00001001.11111111

green = network part, grey = host part

hex0xac100900

decimal2886732032

reverse dns0.9.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:900

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	172.16.9.0/31	172.16.9.0 – 172.16.9.1	172.16.9.1
2	172.16.9.2/31	172.16.9.2 – 172.16.9.3	172.16.9.3
3	172.16.9.4/31	172.16.9.4 – 172.16.9.5	172.16.9.5
4	172.16.9.6/31	172.16.9.6 – 172.16.9.7	172.16.9.7
5	172.16.9.8/31	172.16.9.8 – 172.16.9.9	172.16.9.9
6	172.16.9.10/31	172.16.9.10 – 172.16.9.11	172.16.9.11
7	172.16.9.12/31	172.16.9.12 – 172.16.9.13	172.16.9.13
8	172.16.9.14/31	172.16.9.14 – 172.16.9.15	172.16.9.15
9	172.16.9.16/31	172.16.9.16 – 172.16.9.17	172.16.9.17
10	172.16.9.18/31	172.16.9.18 – 172.16.9.19	172.16.9.19
11	172.16.9.20/31	172.16.9.20 – 172.16.9.21	172.16.9.21
12	172.16.9.22/31	172.16.9.22 – 172.16.9.23	172.16.9.23
13	172.16.9.24/31	172.16.9.24 – 172.16.9.25	172.16.9.25
14	172.16.9.26/31	172.16.9.26 – 172.16.9.27	172.16.9.27
15	172.16.9.28/31	172.16.9.28 – 172.16.9.29	172.16.9.29
16	172.16.9.30/31	172.16.9.30 – 172.16.9.31	172.16.9.31
17	172.16.9.32/31	172.16.9.32 – 172.16.9.33	172.16.9.33
18	172.16.9.34/31	172.16.9.34 – 172.16.9.35	172.16.9.35
19	172.16.9.36/31	172.16.9.36 – 172.16.9.37	172.16.9.37
20	172.16.9.38/31	172.16.9.38 – 172.16.9.39	172.16.9.39
21	172.16.9.40/31	172.16.9.40 – 172.16.9.41	172.16.9.41
22	172.16.9.42/31	172.16.9.42 – 172.16.9.43	172.16.9.43
23	172.16.9.44/31	172.16.9.44 – 172.16.9.45	172.16.9.45
24	172.16.9.46/31	172.16.9.46 – 172.16.9.47	172.16.9.47
25	172.16.9.48/31	172.16.9.48 – 172.16.9.49	172.16.9.49
26	172.16.9.50/31	172.16.9.50 – 172.16.9.51	172.16.9.51
27	172.16.9.52/31	172.16.9.52 – 172.16.9.53	172.16.9.53
28	172.16.9.54/31	172.16.9.54 – 172.16.9.55	172.16.9.55
29	172.16.9.56/31	172.16.9.56 – 172.16.9.57	172.16.9.57
30	172.16.9.58/31	172.16.9.58 – 172.16.9.59	172.16.9.59
31	172.16.9.60/31	172.16.9.60 – 172.16.9.61	172.16.9.61
32	172.16.9.62/31	172.16.9.62 – 172.16.9.63	172.16.9.63
33	172.16.9.64/31	172.16.9.64 – 172.16.9.65	172.16.9.65
34	172.16.9.66/31	172.16.9.66 – 172.16.9.67	172.16.9.67
35	172.16.9.68/31	172.16.9.68 – 172.16.9.69	172.16.9.69
36	172.16.9.70/31	172.16.9.70 – 172.16.9.71	172.16.9.71
37	172.16.9.72/31	172.16.9.72 – 172.16.9.73	172.16.9.73
38	172.16.9.74/31	172.16.9.74 – 172.16.9.75	172.16.9.75
39	172.16.9.76/31	172.16.9.76 – 172.16.9.77	172.16.9.77
40	172.16.9.78/31	172.16.9.78 – 172.16.9.79	172.16.9.79
41	172.16.9.80/31	172.16.9.80 – 172.16.9.81	172.16.9.81
42	172.16.9.82/31	172.16.9.82 – 172.16.9.83	172.16.9.83
43	172.16.9.84/31	172.16.9.84 – 172.16.9.85	172.16.9.85
44	172.16.9.86/31	172.16.9.86 – 172.16.9.87	172.16.9.87
45	172.16.9.88/31	172.16.9.88 – 172.16.9.89	172.16.9.89
46	172.16.9.90/31	172.16.9.90 – 172.16.9.91	172.16.9.91
47	172.16.9.92/31	172.16.9.92 – 172.16.9.93	172.16.9.93
48	172.16.9.94/31	172.16.9.94 – 172.16.9.95	172.16.9.95
49	172.16.9.96/31	172.16.9.96 – 172.16.9.97	172.16.9.97
50	172.16.9.98/31	172.16.9.98 – 172.16.9.99	172.16.9.99
51	172.16.9.100/31	172.16.9.100 – 172.16.9.101	172.16.9.101
52	172.16.9.102/31	172.16.9.102 – 172.16.9.103	172.16.9.103
53	172.16.9.104/31	172.16.9.104 – 172.16.9.105	172.16.9.105
54	172.16.9.106/31	172.16.9.106 – 172.16.9.107	172.16.9.107
55	172.16.9.108/31	172.16.9.108 – 172.16.9.109	172.16.9.109
56	172.16.9.110/31	172.16.9.110 – 172.16.9.111	172.16.9.111
57	172.16.9.112/31	172.16.9.112 – 172.16.9.113	172.16.9.113
58	172.16.9.114/31	172.16.9.114 – 172.16.9.115	172.16.9.115
59	172.16.9.116/31	172.16.9.116 – 172.16.9.117	172.16.9.117
60	172.16.9.118/31	172.16.9.118 – 172.16.9.119	172.16.9.119
61	172.16.9.120/31	172.16.9.120 – 172.16.9.121	172.16.9.121
62	172.16.9.122/31	172.16.9.122 – 172.16.9.123	172.16.9.123
63	172.16.9.124/31	172.16.9.124 – 172.16.9.125	172.16.9.125
64	172.16.9.126/31	172.16.9.126 – 172.16.9.127	172.16.9.127
65	172.16.9.128/31	172.16.9.128 – 172.16.9.129	172.16.9.129
66	172.16.9.130/31	172.16.9.130 – 172.16.9.131	172.16.9.131
67	172.16.9.132/31	172.16.9.132 – 172.16.9.133	172.16.9.133
68	172.16.9.134/31	172.16.9.134 – 172.16.9.135	172.16.9.135
69	172.16.9.136/31	172.16.9.136 – 172.16.9.137	172.16.9.137
70	172.16.9.138/31	172.16.9.138 – 172.16.9.139	172.16.9.139
71	172.16.9.140/31	172.16.9.140 – 172.16.9.141	172.16.9.141
72	172.16.9.142/31	172.16.9.142 – 172.16.9.143	172.16.9.143
73	172.16.9.144/31	172.16.9.144 – 172.16.9.145	172.16.9.145
74	172.16.9.146/31	172.16.9.146 – 172.16.9.147	172.16.9.147
75	172.16.9.148/31	172.16.9.148 – 172.16.9.149	172.16.9.149
76	172.16.9.150/31	172.16.9.150 – 172.16.9.151	172.16.9.151
77	172.16.9.152/31	172.16.9.152 – 172.16.9.153	172.16.9.153
78	172.16.9.154/31	172.16.9.154 – 172.16.9.155	172.16.9.155
79	172.16.9.156/31	172.16.9.156 – 172.16.9.157	172.16.9.157
80	172.16.9.158/31	172.16.9.158 – 172.16.9.159	172.16.9.159
81	172.16.9.160/31	172.16.9.160 – 172.16.9.161	172.16.9.161
82	172.16.9.162/31	172.16.9.162 – 172.16.9.163	172.16.9.163
83	172.16.9.164/31	172.16.9.164 – 172.16.9.165	172.16.9.165
84	172.16.9.166/31	172.16.9.166 – 172.16.9.167	172.16.9.167
85	172.16.9.168/31	172.16.9.168 – 172.16.9.169	172.16.9.169
86	172.16.9.170/31	172.16.9.170 – 172.16.9.171	172.16.9.171
87	172.16.9.172/31	172.16.9.172 – 172.16.9.173	172.16.9.173
88	172.16.9.174/31	172.16.9.174 – 172.16.9.175	172.16.9.175
89	172.16.9.176/31	172.16.9.176 – 172.16.9.177	172.16.9.177
90	172.16.9.178/31	172.16.9.178 – 172.16.9.179	172.16.9.179
91	172.16.9.180/31	172.16.9.180 – 172.16.9.181	172.16.9.181
92	172.16.9.182/31	172.16.9.182 – 172.16.9.183	172.16.9.183
93	172.16.9.184/31	172.16.9.184 – 172.16.9.185	172.16.9.185
94	172.16.9.186/31	172.16.9.186 – 172.16.9.187	172.16.9.187
95	172.16.9.188/31	172.16.9.188 – 172.16.9.189	172.16.9.189
96	172.16.9.190/31	172.16.9.190 – 172.16.9.191	172.16.9.191
97	172.16.9.192/31	172.16.9.192 – 172.16.9.193	172.16.9.193
98	172.16.9.194/31	172.16.9.194 – 172.16.9.195	172.16.9.195
99	172.16.9.196/31	172.16.9.196 – 172.16.9.197	172.16.9.197
100	172.16.9.198/31	172.16.9.198 – 172.16.9.199	172.16.9.199
101	172.16.9.200/31	172.16.9.200 – 172.16.9.201	172.16.9.201
102	172.16.9.202/31	172.16.9.202 – 172.16.9.203	172.16.9.203
103	172.16.9.204/31	172.16.9.204 – 172.16.9.205	172.16.9.205
104	172.16.9.206/31	172.16.9.206 – 172.16.9.207	172.16.9.207
105	172.16.9.208/31	172.16.9.208 – 172.16.9.209	172.16.9.209
106	172.16.9.210/31	172.16.9.210 – 172.16.9.211	172.16.9.211
107	172.16.9.212/31	172.16.9.212 – 172.16.9.213	172.16.9.213
108	172.16.9.214/31	172.16.9.214 – 172.16.9.215	172.16.9.215
109	172.16.9.216/31	172.16.9.216 – 172.16.9.217	172.16.9.217
110	172.16.9.218/31	172.16.9.218 – 172.16.9.219	172.16.9.219
111	172.16.9.220/31	172.16.9.220 – 172.16.9.221	172.16.9.221
112	172.16.9.222/31	172.16.9.222 – 172.16.9.223	172.16.9.223
113	172.16.9.224/31	172.16.9.224 – 172.16.9.225	172.16.9.225
114	172.16.9.226/31	172.16.9.226 – 172.16.9.227	172.16.9.227
115	172.16.9.228/31	172.16.9.228 – 172.16.9.229	172.16.9.229
116	172.16.9.230/31	172.16.9.230 – 172.16.9.231	172.16.9.231
117	172.16.9.232/31	172.16.9.232 – 172.16.9.233	172.16.9.233
118	172.16.9.234/31	172.16.9.234 – 172.16.9.235	172.16.9.235
119	172.16.9.236/31	172.16.9.236 – 172.16.9.237	172.16.9.237
120	172.16.9.238/31	172.16.9.238 – 172.16.9.239	172.16.9.239
121	172.16.9.240/31	172.16.9.240 – 172.16.9.241	172.16.9.241
122	172.16.9.242/31	172.16.9.242 – 172.16.9.243	172.16.9.243
123	172.16.9.244/31	172.16.9.244 – 172.16.9.245	172.16.9.245
124	172.16.9.246/31	172.16.9.246 – 172.16.9.247	172.16.9.247
125	172.16.9.248/31	172.16.9.248 – 172.16.9.249	172.16.9.249
126	172.16.9.250/31	172.16.9.250 – 172.16.9.251	172.16.9.251
127	172.16.9.252/31	172.16.9.252 – 172.16.9.253	172.16.9.253
128	172.16.9.254/31	172.16.9.254 – 172.16.9.255	172.16.9.255

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 →