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)10.2.145.128/25

network10.2.145.128/25

broadcast10.2.145.255

first host10.2.145.129

last host10.2.145.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.145.128/25

address00001010.00000010.10010001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10010001.10000000

broadcast00001010.00000010.10010001.11111111

green = network part, grey = host part

hex0x0a029180

decimal167940480

reverse dns128.145.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9180

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.145.128/32	10.2.145.128 – 10.2.145.128	10.2.145.128
2	10.2.145.129/32	10.2.145.129 – 10.2.145.129	10.2.145.129
3	10.2.145.130/32	10.2.145.130 – 10.2.145.130	10.2.145.130
4	10.2.145.131/32	10.2.145.131 – 10.2.145.131	10.2.145.131
5	10.2.145.132/32	10.2.145.132 – 10.2.145.132	10.2.145.132
6	10.2.145.133/32	10.2.145.133 – 10.2.145.133	10.2.145.133
7	10.2.145.134/32	10.2.145.134 – 10.2.145.134	10.2.145.134
8	10.2.145.135/32	10.2.145.135 – 10.2.145.135	10.2.145.135
9	10.2.145.136/32	10.2.145.136 – 10.2.145.136	10.2.145.136
10	10.2.145.137/32	10.2.145.137 – 10.2.145.137	10.2.145.137
11	10.2.145.138/32	10.2.145.138 – 10.2.145.138	10.2.145.138
12	10.2.145.139/32	10.2.145.139 – 10.2.145.139	10.2.145.139
13	10.2.145.140/32	10.2.145.140 – 10.2.145.140	10.2.145.140
14	10.2.145.141/32	10.2.145.141 – 10.2.145.141	10.2.145.141
15	10.2.145.142/32	10.2.145.142 – 10.2.145.142	10.2.145.142
16	10.2.145.143/32	10.2.145.143 – 10.2.145.143	10.2.145.143
17	10.2.145.144/32	10.2.145.144 – 10.2.145.144	10.2.145.144
18	10.2.145.145/32	10.2.145.145 – 10.2.145.145	10.2.145.145
19	10.2.145.146/32	10.2.145.146 – 10.2.145.146	10.2.145.146
20	10.2.145.147/32	10.2.145.147 – 10.2.145.147	10.2.145.147
21	10.2.145.148/32	10.2.145.148 – 10.2.145.148	10.2.145.148
22	10.2.145.149/32	10.2.145.149 – 10.2.145.149	10.2.145.149
23	10.2.145.150/32	10.2.145.150 – 10.2.145.150	10.2.145.150
24	10.2.145.151/32	10.2.145.151 – 10.2.145.151	10.2.145.151
25	10.2.145.152/32	10.2.145.152 – 10.2.145.152	10.2.145.152
26	10.2.145.153/32	10.2.145.153 – 10.2.145.153	10.2.145.153
27	10.2.145.154/32	10.2.145.154 – 10.2.145.154	10.2.145.154
28	10.2.145.155/32	10.2.145.155 – 10.2.145.155	10.2.145.155
29	10.2.145.156/32	10.2.145.156 – 10.2.145.156	10.2.145.156
30	10.2.145.157/32	10.2.145.157 – 10.2.145.157	10.2.145.157
31	10.2.145.158/32	10.2.145.158 – 10.2.145.158	10.2.145.158
32	10.2.145.159/32	10.2.145.159 – 10.2.145.159	10.2.145.159
33	10.2.145.160/32	10.2.145.160 – 10.2.145.160	10.2.145.160
34	10.2.145.161/32	10.2.145.161 – 10.2.145.161	10.2.145.161
35	10.2.145.162/32	10.2.145.162 – 10.2.145.162	10.2.145.162
36	10.2.145.163/32	10.2.145.163 – 10.2.145.163	10.2.145.163
37	10.2.145.164/32	10.2.145.164 – 10.2.145.164	10.2.145.164
38	10.2.145.165/32	10.2.145.165 – 10.2.145.165	10.2.145.165
39	10.2.145.166/32	10.2.145.166 – 10.2.145.166	10.2.145.166
40	10.2.145.167/32	10.2.145.167 – 10.2.145.167	10.2.145.167
41	10.2.145.168/32	10.2.145.168 – 10.2.145.168	10.2.145.168
42	10.2.145.169/32	10.2.145.169 – 10.2.145.169	10.2.145.169
43	10.2.145.170/32	10.2.145.170 – 10.2.145.170	10.2.145.170
44	10.2.145.171/32	10.2.145.171 – 10.2.145.171	10.2.145.171
45	10.2.145.172/32	10.2.145.172 – 10.2.145.172	10.2.145.172
46	10.2.145.173/32	10.2.145.173 – 10.2.145.173	10.2.145.173
47	10.2.145.174/32	10.2.145.174 – 10.2.145.174	10.2.145.174
48	10.2.145.175/32	10.2.145.175 – 10.2.145.175	10.2.145.175
49	10.2.145.176/32	10.2.145.176 – 10.2.145.176	10.2.145.176
50	10.2.145.177/32	10.2.145.177 – 10.2.145.177	10.2.145.177
51	10.2.145.178/32	10.2.145.178 – 10.2.145.178	10.2.145.178
52	10.2.145.179/32	10.2.145.179 – 10.2.145.179	10.2.145.179
53	10.2.145.180/32	10.2.145.180 – 10.2.145.180	10.2.145.180
54	10.2.145.181/32	10.2.145.181 – 10.2.145.181	10.2.145.181
55	10.2.145.182/32	10.2.145.182 – 10.2.145.182	10.2.145.182
56	10.2.145.183/32	10.2.145.183 – 10.2.145.183	10.2.145.183
57	10.2.145.184/32	10.2.145.184 – 10.2.145.184	10.2.145.184
58	10.2.145.185/32	10.2.145.185 – 10.2.145.185	10.2.145.185
59	10.2.145.186/32	10.2.145.186 – 10.2.145.186	10.2.145.186
60	10.2.145.187/32	10.2.145.187 – 10.2.145.187	10.2.145.187
61	10.2.145.188/32	10.2.145.188 – 10.2.145.188	10.2.145.188
62	10.2.145.189/32	10.2.145.189 – 10.2.145.189	10.2.145.189
63	10.2.145.190/32	10.2.145.190 – 10.2.145.190	10.2.145.190
64	10.2.145.191/32	10.2.145.191 – 10.2.145.191	10.2.145.191
65	10.2.145.192/32	10.2.145.192 – 10.2.145.192	10.2.145.192
66	10.2.145.193/32	10.2.145.193 – 10.2.145.193	10.2.145.193
67	10.2.145.194/32	10.2.145.194 – 10.2.145.194	10.2.145.194
68	10.2.145.195/32	10.2.145.195 – 10.2.145.195	10.2.145.195
69	10.2.145.196/32	10.2.145.196 – 10.2.145.196	10.2.145.196
70	10.2.145.197/32	10.2.145.197 – 10.2.145.197	10.2.145.197
71	10.2.145.198/32	10.2.145.198 – 10.2.145.198	10.2.145.198
72	10.2.145.199/32	10.2.145.199 – 10.2.145.199	10.2.145.199
73	10.2.145.200/32	10.2.145.200 – 10.2.145.200	10.2.145.200
74	10.2.145.201/32	10.2.145.201 – 10.2.145.201	10.2.145.201
75	10.2.145.202/32	10.2.145.202 – 10.2.145.202	10.2.145.202
76	10.2.145.203/32	10.2.145.203 – 10.2.145.203	10.2.145.203
77	10.2.145.204/32	10.2.145.204 – 10.2.145.204	10.2.145.204
78	10.2.145.205/32	10.2.145.205 – 10.2.145.205	10.2.145.205
79	10.2.145.206/32	10.2.145.206 – 10.2.145.206	10.2.145.206
80	10.2.145.207/32	10.2.145.207 – 10.2.145.207	10.2.145.207
81	10.2.145.208/32	10.2.145.208 – 10.2.145.208	10.2.145.208
82	10.2.145.209/32	10.2.145.209 – 10.2.145.209	10.2.145.209
83	10.2.145.210/32	10.2.145.210 – 10.2.145.210	10.2.145.210
84	10.2.145.211/32	10.2.145.211 – 10.2.145.211	10.2.145.211
85	10.2.145.212/32	10.2.145.212 – 10.2.145.212	10.2.145.212
86	10.2.145.213/32	10.2.145.213 – 10.2.145.213	10.2.145.213
87	10.2.145.214/32	10.2.145.214 – 10.2.145.214	10.2.145.214
88	10.2.145.215/32	10.2.145.215 – 10.2.145.215	10.2.145.215
89	10.2.145.216/32	10.2.145.216 – 10.2.145.216	10.2.145.216
90	10.2.145.217/32	10.2.145.217 – 10.2.145.217	10.2.145.217
91	10.2.145.218/32	10.2.145.218 – 10.2.145.218	10.2.145.218
92	10.2.145.219/32	10.2.145.219 – 10.2.145.219	10.2.145.219
93	10.2.145.220/32	10.2.145.220 – 10.2.145.220	10.2.145.220
94	10.2.145.221/32	10.2.145.221 – 10.2.145.221	10.2.145.221
95	10.2.145.222/32	10.2.145.222 – 10.2.145.222	10.2.145.222
96	10.2.145.223/32	10.2.145.223 – 10.2.145.223	10.2.145.223
97	10.2.145.224/32	10.2.145.224 – 10.2.145.224	10.2.145.224
98	10.2.145.225/32	10.2.145.225 – 10.2.145.225	10.2.145.225
99	10.2.145.226/32	10.2.145.226 – 10.2.145.226	10.2.145.226
100	10.2.145.227/32	10.2.145.227 – 10.2.145.227	10.2.145.227
101	10.2.145.228/32	10.2.145.228 – 10.2.145.228	10.2.145.228
102	10.2.145.229/32	10.2.145.229 – 10.2.145.229	10.2.145.229
103	10.2.145.230/32	10.2.145.230 – 10.2.145.230	10.2.145.230
104	10.2.145.231/32	10.2.145.231 – 10.2.145.231	10.2.145.231
105	10.2.145.232/32	10.2.145.232 – 10.2.145.232	10.2.145.232
106	10.2.145.233/32	10.2.145.233 – 10.2.145.233	10.2.145.233
107	10.2.145.234/32	10.2.145.234 – 10.2.145.234	10.2.145.234
108	10.2.145.235/32	10.2.145.235 – 10.2.145.235	10.2.145.235
109	10.2.145.236/32	10.2.145.236 – 10.2.145.236	10.2.145.236
110	10.2.145.237/32	10.2.145.237 – 10.2.145.237	10.2.145.237
111	10.2.145.238/32	10.2.145.238 – 10.2.145.238	10.2.145.238
112	10.2.145.239/32	10.2.145.239 – 10.2.145.239	10.2.145.239
113	10.2.145.240/32	10.2.145.240 – 10.2.145.240	10.2.145.240
114	10.2.145.241/32	10.2.145.241 – 10.2.145.241	10.2.145.241
115	10.2.145.242/32	10.2.145.242 – 10.2.145.242	10.2.145.242
116	10.2.145.243/32	10.2.145.243 – 10.2.145.243	10.2.145.243
117	10.2.145.244/32	10.2.145.244 – 10.2.145.244	10.2.145.244
118	10.2.145.245/32	10.2.145.245 – 10.2.145.245	10.2.145.245
119	10.2.145.246/32	10.2.145.246 – 10.2.145.246	10.2.145.246
120	10.2.145.247/32	10.2.145.247 – 10.2.145.247	10.2.145.247
121	10.2.145.248/32	10.2.145.248 – 10.2.145.248	10.2.145.248
122	10.2.145.249/32	10.2.145.249 – 10.2.145.249	10.2.145.249
123	10.2.145.250/32	10.2.145.250 – 10.2.145.250	10.2.145.250
124	10.2.145.251/32	10.2.145.251 – 10.2.145.251	10.2.145.251
125	10.2.145.252/32	10.2.145.252 – 10.2.145.252	10.2.145.252
126	10.2.145.253/32	10.2.145.253 – 10.2.145.253	10.2.145.253
127	10.2.145.254/32	10.2.145.254 – 10.2.145.254	10.2.145.254
128	10.2.145.255/32	10.2.145.255 – 10.2.145.255	10.2.145.255

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 →