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)10.2.9.128/25

network10.2.9.128/25

broadcast10.2.9.255

first host10.2.9.129

last host10.2.9.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.9.128/25

address00001010.00000010.00001001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00001001.10000000

broadcast00001010.00000010.00001001.11111111

green = network part, grey = host part

hex0x0a020980

decimal167905664

reverse dns128.9.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:980

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.9.128/32	10.2.9.128 – 10.2.9.128	10.2.9.128
2	10.2.9.129/32	10.2.9.129 – 10.2.9.129	10.2.9.129
3	10.2.9.130/32	10.2.9.130 – 10.2.9.130	10.2.9.130
4	10.2.9.131/32	10.2.9.131 – 10.2.9.131	10.2.9.131
5	10.2.9.132/32	10.2.9.132 – 10.2.9.132	10.2.9.132
6	10.2.9.133/32	10.2.9.133 – 10.2.9.133	10.2.9.133
7	10.2.9.134/32	10.2.9.134 – 10.2.9.134	10.2.9.134
8	10.2.9.135/32	10.2.9.135 – 10.2.9.135	10.2.9.135
9	10.2.9.136/32	10.2.9.136 – 10.2.9.136	10.2.9.136
10	10.2.9.137/32	10.2.9.137 – 10.2.9.137	10.2.9.137
11	10.2.9.138/32	10.2.9.138 – 10.2.9.138	10.2.9.138
12	10.2.9.139/32	10.2.9.139 – 10.2.9.139	10.2.9.139
13	10.2.9.140/32	10.2.9.140 – 10.2.9.140	10.2.9.140
14	10.2.9.141/32	10.2.9.141 – 10.2.9.141	10.2.9.141
15	10.2.9.142/32	10.2.9.142 – 10.2.9.142	10.2.9.142
16	10.2.9.143/32	10.2.9.143 – 10.2.9.143	10.2.9.143
17	10.2.9.144/32	10.2.9.144 – 10.2.9.144	10.2.9.144
18	10.2.9.145/32	10.2.9.145 – 10.2.9.145	10.2.9.145
19	10.2.9.146/32	10.2.9.146 – 10.2.9.146	10.2.9.146
20	10.2.9.147/32	10.2.9.147 – 10.2.9.147	10.2.9.147
21	10.2.9.148/32	10.2.9.148 – 10.2.9.148	10.2.9.148
22	10.2.9.149/32	10.2.9.149 – 10.2.9.149	10.2.9.149
23	10.2.9.150/32	10.2.9.150 – 10.2.9.150	10.2.9.150
24	10.2.9.151/32	10.2.9.151 – 10.2.9.151	10.2.9.151
25	10.2.9.152/32	10.2.9.152 – 10.2.9.152	10.2.9.152
26	10.2.9.153/32	10.2.9.153 – 10.2.9.153	10.2.9.153
27	10.2.9.154/32	10.2.9.154 – 10.2.9.154	10.2.9.154
28	10.2.9.155/32	10.2.9.155 – 10.2.9.155	10.2.9.155
29	10.2.9.156/32	10.2.9.156 – 10.2.9.156	10.2.9.156
30	10.2.9.157/32	10.2.9.157 – 10.2.9.157	10.2.9.157
31	10.2.9.158/32	10.2.9.158 – 10.2.9.158	10.2.9.158
32	10.2.9.159/32	10.2.9.159 – 10.2.9.159	10.2.9.159
33	10.2.9.160/32	10.2.9.160 – 10.2.9.160	10.2.9.160
34	10.2.9.161/32	10.2.9.161 – 10.2.9.161	10.2.9.161
35	10.2.9.162/32	10.2.9.162 – 10.2.9.162	10.2.9.162
36	10.2.9.163/32	10.2.9.163 – 10.2.9.163	10.2.9.163
37	10.2.9.164/32	10.2.9.164 – 10.2.9.164	10.2.9.164
38	10.2.9.165/32	10.2.9.165 – 10.2.9.165	10.2.9.165
39	10.2.9.166/32	10.2.9.166 – 10.2.9.166	10.2.9.166
40	10.2.9.167/32	10.2.9.167 – 10.2.9.167	10.2.9.167
41	10.2.9.168/32	10.2.9.168 – 10.2.9.168	10.2.9.168
42	10.2.9.169/32	10.2.9.169 – 10.2.9.169	10.2.9.169
43	10.2.9.170/32	10.2.9.170 – 10.2.9.170	10.2.9.170
44	10.2.9.171/32	10.2.9.171 – 10.2.9.171	10.2.9.171
45	10.2.9.172/32	10.2.9.172 – 10.2.9.172	10.2.9.172
46	10.2.9.173/32	10.2.9.173 – 10.2.9.173	10.2.9.173
47	10.2.9.174/32	10.2.9.174 – 10.2.9.174	10.2.9.174
48	10.2.9.175/32	10.2.9.175 – 10.2.9.175	10.2.9.175
49	10.2.9.176/32	10.2.9.176 – 10.2.9.176	10.2.9.176
50	10.2.9.177/32	10.2.9.177 – 10.2.9.177	10.2.9.177
51	10.2.9.178/32	10.2.9.178 – 10.2.9.178	10.2.9.178
52	10.2.9.179/32	10.2.9.179 – 10.2.9.179	10.2.9.179
53	10.2.9.180/32	10.2.9.180 – 10.2.9.180	10.2.9.180
54	10.2.9.181/32	10.2.9.181 – 10.2.9.181	10.2.9.181
55	10.2.9.182/32	10.2.9.182 – 10.2.9.182	10.2.9.182
56	10.2.9.183/32	10.2.9.183 – 10.2.9.183	10.2.9.183
57	10.2.9.184/32	10.2.9.184 – 10.2.9.184	10.2.9.184
58	10.2.9.185/32	10.2.9.185 – 10.2.9.185	10.2.9.185
59	10.2.9.186/32	10.2.9.186 – 10.2.9.186	10.2.9.186
60	10.2.9.187/32	10.2.9.187 – 10.2.9.187	10.2.9.187
61	10.2.9.188/32	10.2.9.188 – 10.2.9.188	10.2.9.188
62	10.2.9.189/32	10.2.9.189 – 10.2.9.189	10.2.9.189
63	10.2.9.190/32	10.2.9.190 – 10.2.9.190	10.2.9.190
64	10.2.9.191/32	10.2.9.191 – 10.2.9.191	10.2.9.191
65	10.2.9.192/32	10.2.9.192 – 10.2.9.192	10.2.9.192
66	10.2.9.193/32	10.2.9.193 – 10.2.9.193	10.2.9.193
67	10.2.9.194/32	10.2.9.194 – 10.2.9.194	10.2.9.194
68	10.2.9.195/32	10.2.9.195 – 10.2.9.195	10.2.9.195
69	10.2.9.196/32	10.2.9.196 – 10.2.9.196	10.2.9.196
70	10.2.9.197/32	10.2.9.197 – 10.2.9.197	10.2.9.197
71	10.2.9.198/32	10.2.9.198 – 10.2.9.198	10.2.9.198
72	10.2.9.199/32	10.2.9.199 – 10.2.9.199	10.2.9.199
73	10.2.9.200/32	10.2.9.200 – 10.2.9.200	10.2.9.200
74	10.2.9.201/32	10.2.9.201 – 10.2.9.201	10.2.9.201
75	10.2.9.202/32	10.2.9.202 – 10.2.9.202	10.2.9.202
76	10.2.9.203/32	10.2.9.203 – 10.2.9.203	10.2.9.203
77	10.2.9.204/32	10.2.9.204 – 10.2.9.204	10.2.9.204
78	10.2.9.205/32	10.2.9.205 – 10.2.9.205	10.2.9.205
79	10.2.9.206/32	10.2.9.206 – 10.2.9.206	10.2.9.206
80	10.2.9.207/32	10.2.9.207 – 10.2.9.207	10.2.9.207
81	10.2.9.208/32	10.2.9.208 – 10.2.9.208	10.2.9.208
82	10.2.9.209/32	10.2.9.209 – 10.2.9.209	10.2.9.209
83	10.2.9.210/32	10.2.9.210 – 10.2.9.210	10.2.9.210
84	10.2.9.211/32	10.2.9.211 – 10.2.9.211	10.2.9.211
85	10.2.9.212/32	10.2.9.212 – 10.2.9.212	10.2.9.212
86	10.2.9.213/32	10.2.9.213 – 10.2.9.213	10.2.9.213
87	10.2.9.214/32	10.2.9.214 – 10.2.9.214	10.2.9.214
88	10.2.9.215/32	10.2.9.215 – 10.2.9.215	10.2.9.215
89	10.2.9.216/32	10.2.9.216 – 10.2.9.216	10.2.9.216
90	10.2.9.217/32	10.2.9.217 – 10.2.9.217	10.2.9.217
91	10.2.9.218/32	10.2.9.218 – 10.2.9.218	10.2.9.218
92	10.2.9.219/32	10.2.9.219 – 10.2.9.219	10.2.9.219
93	10.2.9.220/32	10.2.9.220 – 10.2.9.220	10.2.9.220
94	10.2.9.221/32	10.2.9.221 – 10.2.9.221	10.2.9.221
95	10.2.9.222/32	10.2.9.222 – 10.2.9.222	10.2.9.222
96	10.2.9.223/32	10.2.9.223 – 10.2.9.223	10.2.9.223
97	10.2.9.224/32	10.2.9.224 – 10.2.9.224	10.2.9.224
98	10.2.9.225/32	10.2.9.225 – 10.2.9.225	10.2.9.225
99	10.2.9.226/32	10.2.9.226 – 10.2.9.226	10.2.9.226
100	10.2.9.227/32	10.2.9.227 – 10.2.9.227	10.2.9.227
101	10.2.9.228/32	10.2.9.228 – 10.2.9.228	10.2.9.228
102	10.2.9.229/32	10.2.9.229 – 10.2.9.229	10.2.9.229
103	10.2.9.230/32	10.2.9.230 – 10.2.9.230	10.2.9.230
104	10.2.9.231/32	10.2.9.231 – 10.2.9.231	10.2.9.231
105	10.2.9.232/32	10.2.9.232 – 10.2.9.232	10.2.9.232
106	10.2.9.233/32	10.2.9.233 – 10.2.9.233	10.2.9.233
107	10.2.9.234/32	10.2.9.234 – 10.2.9.234	10.2.9.234
108	10.2.9.235/32	10.2.9.235 – 10.2.9.235	10.2.9.235
109	10.2.9.236/32	10.2.9.236 – 10.2.9.236	10.2.9.236
110	10.2.9.237/32	10.2.9.237 – 10.2.9.237	10.2.9.237
111	10.2.9.238/32	10.2.9.238 – 10.2.9.238	10.2.9.238
112	10.2.9.239/32	10.2.9.239 – 10.2.9.239	10.2.9.239
113	10.2.9.240/32	10.2.9.240 – 10.2.9.240	10.2.9.240
114	10.2.9.241/32	10.2.9.241 – 10.2.9.241	10.2.9.241
115	10.2.9.242/32	10.2.9.242 – 10.2.9.242	10.2.9.242
116	10.2.9.243/32	10.2.9.243 – 10.2.9.243	10.2.9.243
117	10.2.9.244/32	10.2.9.244 – 10.2.9.244	10.2.9.244
118	10.2.9.245/32	10.2.9.245 – 10.2.9.245	10.2.9.245
119	10.2.9.246/32	10.2.9.246 – 10.2.9.246	10.2.9.246
120	10.2.9.247/32	10.2.9.247 – 10.2.9.247	10.2.9.247
121	10.2.9.248/32	10.2.9.248 – 10.2.9.248	10.2.9.248
122	10.2.9.249/32	10.2.9.249 – 10.2.9.249	10.2.9.249
123	10.2.9.250/32	10.2.9.250 – 10.2.9.250	10.2.9.250
124	10.2.9.251/32	10.2.9.251 – 10.2.9.251	10.2.9.251
125	10.2.9.252/32	10.2.9.252 – 10.2.9.252	10.2.9.252
126	10.2.9.253/32	10.2.9.253 – 10.2.9.253	10.2.9.253
127	10.2.9.254/32	10.2.9.254 – 10.2.9.254	10.2.9.254
128	10.2.9.255/32	10.2.9.255 – 10.2.9.255	10.2.9.255

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 /25
/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	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →