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)10.2.185.128/25

network10.2.185.128/25

broadcast10.2.185.255

first host10.2.185.129

last host10.2.185.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.185.128/25

address00001010.00000010.10111001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10111001.10000000

broadcast00001010.00000010.10111001.11111111

green = network part, grey = host part

hex0x0a02b980

decimal167950720

reverse dns128.185.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b980

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.185.128/32	10.2.185.128 – 10.2.185.128	10.2.185.128
2	10.2.185.129/32	10.2.185.129 – 10.2.185.129	10.2.185.129
3	10.2.185.130/32	10.2.185.130 – 10.2.185.130	10.2.185.130
4	10.2.185.131/32	10.2.185.131 – 10.2.185.131	10.2.185.131
5	10.2.185.132/32	10.2.185.132 – 10.2.185.132	10.2.185.132
6	10.2.185.133/32	10.2.185.133 – 10.2.185.133	10.2.185.133
7	10.2.185.134/32	10.2.185.134 – 10.2.185.134	10.2.185.134
8	10.2.185.135/32	10.2.185.135 – 10.2.185.135	10.2.185.135
9	10.2.185.136/32	10.2.185.136 – 10.2.185.136	10.2.185.136
10	10.2.185.137/32	10.2.185.137 – 10.2.185.137	10.2.185.137
11	10.2.185.138/32	10.2.185.138 – 10.2.185.138	10.2.185.138
12	10.2.185.139/32	10.2.185.139 – 10.2.185.139	10.2.185.139
13	10.2.185.140/32	10.2.185.140 – 10.2.185.140	10.2.185.140
14	10.2.185.141/32	10.2.185.141 – 10.2.185.141	10.2.185.141
15	10.2.185.142/32	10.2.185.142 – 10.2.185.142	10.2.185.142
16	10.2.185.143/32	10.2.185.143 – 10.2.185.143	10.2.185.143
17	10.2.185.144/32	10.2.185.144 – 10.2.185.144	10.2.185.144
18	10.2.185.145/32	10.2.185.145 – 10.2.185.145	10.2.185.145
19	10.2.185.146/32	10.2.185.146 – 10.2.185.146	10.2.185.146
20	10.2.185.147/32	10.2.185.147 – 10.2.185.147	10.2.185.147
21	10.2.185.148/32	10.2.185.148 – 10.2.185.148	10.2.185.148
22	10.2.185.149/32	10.2.185.149 – 10.2.185.149	10.2.185.149
23	10.2.185.150/32	10.2.185.150 – 10.2.185.150	10.2.185.150
24	10.2.185.151/32	10.2.185.151 – 10.2.185.151	10.2.185.151
25	10.2.185.152/32	10.2.185.152 – 10.2.185.152	10.2.185.152
26	10.2.185.153/32	10.2.185.153 – 10.2.185.153	10.2.185.153
27	10.2.185.154/32	10.2.185.154 – 10.2.185.154	10.2.185.154
28	10.2.185.155/32	10.2.185.155 – 10.2.185.155	10.2.185.155
29	10.2.185.156/32	10.2.185.156 – 10.2.185.156	10.2.185.156
30	10.2.185.157/32	10.2.185.157 – 10.2.185.157	10.2.185.157
31	10.2.185.158/32	10.2.185.158 – 10.2.185.158	10.2.185.158
32	10.2.185.159/32	10.2.185.159 – 10.2.185.159	10.2.185.159
33	10.2.185.160/32	10.2.185.160 – 10.2.185.160	10.2.185.160
34	10.2.185.161/32	10.2.185.161 – 10.2.185.161	10.2.185.161
35	10.2.185.162/32	10.2.185.162 – 10.2.185.162	10.2.185.162
36	10.2.185.163/32	10.2.185.163 – 10.2.185.163	10.2.185.163
37	10.2.185.164/32	10.2.185.164 – 10.2.185.164	10.2.185.164
38	10.2.185.165/32	10.2.185.165 – 10.2.185.165	10.2.185.165
39	10.2.185.166/32	10.2.185.166 – 10.2.185.166	10.2.185.166
40	10.2.185.167/32	10.2.185.167 – 10.2.185.167	10.2.185.167
41	10.2.185.168/32	10.2.185.168 – 10.2.185.168	10.2.185.168
42	10.2.185.169/32	10.2.185.169 – 10.2.185.169	10.2.185.169
43	10.2.185.170/32	10.2.185.170 – 10.2.185.170	10.2.185.170
44	10.2.185.171/32	10.2.185.171 – 10.2.185.171	10.2.185.171
45	10.2.185.172/32	10.2.185.172 – 10.2.185.172	10.2.185.172
46	10.2.185.173/32	10.2.185.173 – 10.2.185.173	10.2.185.173
47	10.2.185.174/32	10.2.185.174 – 10.2.185.174	10.2.185.174
48	10.2.185.175/32	10.2.185.175 – 10.2.185.175	10.2.185.175
49	10.2.185.176/32	10.2.185.176 – 10.2.185.176	10.2.185.176
50	10.2.185.177/32	10.2.185.177 – 10.2.185.177	10.2.185.177
51	10.2.185.178/32	10.2.185.178 – 10.2.185.178	10.2.185.178
52	10.2.185.179/32	10.2.185.179 – 10.2.185.179	10.2.185.179
53	10.2.185.180/32	10.2.185.180 – 10.2.185.180	10.2.185.180
54	10.2.185.181/32	10.2.185.181 – 10.2.185.181	10.2.185.181
55	10.2.185.182/32	10.2.185.182 – 10.2.185.182	10.2.185.182
56	10.2.185.183/32	10.2.185.183 – 10.2.185.183	10.2.185.183
57	10.2.185.184/32	10.2.185.184 – 10.2.185.184	10.2.185.184
58	10.2.185.185/32	10.2.185.185 – 10.2.185.185	10.2.185.185
59	10.2.185.186/32	10.2.185.186 – 10.2.185.186	10.2.185.186
60	10.2.185.187/32	10.2.185.187 – 10.2.185.187	10.2.185.187
61	10.2.185.188/32	10.2.185.188 – 10.2.185.188	10.2.185.188
62	10.2.185.189/32	10.2.185.189 – 10.2.185.189	10.2.185.189
63	10.2.185.190/32	10.2.185.190 – 10.2.185.190	10.2.185.190
64	10.2.185.191/32	10.2.185.191 – 10.2.185.191	10.2.185.191
65	10.2.185.192/32	10.2.185.192 – 10.2.185.192	10.2.185.192
66	10.2.185.193/32	10.2.185.193 – 10.2.185.193	10.2.185.193
67	10.2.185.194/32	10.2.185.194 – 10.2.185.194	10.2.185.194
68	10.2.185.195/32	10.2.185.195 – 10.2.185.195	10.2.185.195
69	10.2.185.196/32	10.2.185.196 – 10.2.185.196	10.2.185.196
70	10.2.185.197/32	10.2.185.197 – 10.2.185.197	10.2.185.197
71	10.2.185.198/32	10.2.185.198 – 10.2.185.198	10.2.185.198
72	10.2.185.199/32	10.2.185.199 – 10.2.185.199	10.2.185.199
73	10.2.185.200/32	10.2.185.200 – 10.2.185.200	10.2.185.200
74	10.2.185.201/32	10.2.185.201 – 10.2.185.201	10.2.185.201
75	10.2.185.202/32	10.2.185.202 – 10.2.185.202	10.2.185.202
76	10.2.185.203/32	10.2.185.203 – 10.2.185.203	10.2.185.203
77	10.2.185.204/32	10.2.185.204 – 10.2.185.204	10.2.185.204
78	10.2.185.205/32	10.2.185.205 – 10.2.185.205	10.2.185.205
79	10.2.185.206/32	10.2.185.206 – 10.2.185.206	10.2.185.206
80	10.2.185.207/32	10.2.185.207 – 10.2.185.207	10.2.185.207
81	10.2.185.208/32	10.2.185.208 – 10.2.185.208	10.2.185.208
82	10.2.185.209/32	10.2.185.209 – 10.2.185.209	10.2.185.209
83	10.2.185.210/32	10.2.185.210 – 10.2.185.210	10.2.185.210
84	10.2.185.211/32	10.2.185.211 – 10.2.185.211	10.2.185.211
85	10.2.185.212/32	10.2.185.212 – 10.2.185.212	10.2.185.212
86	10.2.185.213/32	10.2.185.213 – 10.2.185.213	10.2.185.213
87	10.2.185.214/32	10.2.185.214 – 10.2.185.214	10.2.185.214
88	10.2.185.215/32	10.2.185.215 – 10.2.185.215	10.2.185.215
89	10.2.185.216/32	10.2.185.216 – 10.2.185.216	10.2.185.216
90	10.2.185.217/32	10.2.185.217 – 10.2.185.217	10.2.185.217
91	10.2.185.218/32	10.2.185.218 – 10.2.185.218	10.2.185.218
92	10.2.185.219/32	10.2.185.219 – 10.2.185.219	10.2.185.219
93	10.2.185.220/32	10.2.185.220 – 10.2.185.220	10.2.185.220
94	10.2.185.221/32	10.2.185.221 – 10.2.185.221	10.2.185.221
95	10.2.185.222/32	10.2.185.222 – 10.2.185.222	10.2.185.222
96	10.2.185.223/32	10.2.185.223 – 10.2.185.223	10.2.185.223
97	10.2.185.224/32	10.2.185.224 – 10.2.185.224	10.2.185.224
98	10.2.185.225/32	10.2.185.225 – 10.2.185.225	10.2.185.225
99	10.2.185.226/32	10.2.185.226 – 10.2.185.226	10.2.185.226
100	10.2.185.227/32	10.2.185.227 – 10.2.185.227	10.2.185.227
101	10.2.185.228/32	10.2.185.228 – 10.2.185.228	10.2.185.228
102	10.2.185.229/32	10.2.185.229 – 10.2.185.229	10.2.185.229
103	10.2.185.230/32	10.2.185.230 – 10.2.185.230	10.2.185.230
104	10.2.185.231/32	10.2.185.231 – 10.2.185.231	10.2.185.231
105	10.2.185.232/32	10.2.185.232 – 10.2.185.232	10.2.185.232
106	10.2.185.233/32	10.2.185.233 – 10.2.185.233	10.2.185.233
107	10.2.185.234/32	10.2.185.234 – 10.2.185.234	10.2.185.234
108	10.2.185.235/32	10.2.185.235 – 10.2.185.235	10.2.185.235
109	10.2.185.236/32	10.2.185.236 – 10.2.185.236	10.2.185.236
110	10.2.185.237/32	10.2.185.237 – 10.2.185.237	10.2.185.237
111	10.2.185.238/32	10.2.185.238 – 10.2.185.238	10.2.185.238
112	10.2.185.239/32	10.2.185.239 – 10.2.185.239	10.2.185.239
113	10.2.185.240/32	10.2.185.240 – 10.2.185.240	10.2.185.240
114	10.2.185.241/32	10.2.185.241 – 10.2.185.241	10.2.185.241
115	10.2.185.242/32	10.2.185.242 – 10.2.185.242	10.2.185.242
116	10.2.185.243/32	10.2.185.243 – 10.2.185.243	10.2.185.243
117	10.2.185.244/32	10.2.185.244 – 10.2.185.244	10.2.185.244
118	10.2.185.245/32	10.2.185.245 – 10.2.185.245	10.2.185.245
119	10.2.185.246/32	10.2.185.246 – 10.2.185.246	10.2.185.246
120	10.2.185.247/32	10.2.185.247 – 10.2.185.247	10.2.185.247
121	10.2.185.248/32	10.2.185.248 – 10.2.185.248	10.2.185.248
122	10.2.185.249/32	10.2.185.249 – 10.2.185.249	10.2.185.249
123	10.2.185.250/32	10.2.185.250 – 10.2.185.250	10.2.185.250
124	10.2.185.251/32	10.2.185.251 – 10.2.185.251	10.2.185.251
125	10.2.185.252/32	10.2.185.252 – 10.2.185.252	10.2.185.252
126	10.2.185.253/32	10.2.185.253 – 10.2.185.253	10.2.185.253
127	10.2.185.254/32	10.2.185.254 – 10.2.185.254	10.2.185.254
128	10.2.185.255/32	10.2.185.255 – 10.2.185.255	10.2.185.255

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 →