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)10.3.149.128/25

network10.3.149.128/25

broadcast10.3.149.255

first host10.3.149.129

last host10.3.149.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.149.128/25

address00001010.00000011.10010101.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10010101.10000000

broadcast00001010.00000011.10010101.11111111

green = network part, grey = host part

hex0x0a039580

decimal168007040

reverse dns128.149.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9580

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.149.128/32	10.3.149.128 – 10.3.149.128	10.3.149.128
2	10.3.149.129/32	10.3.149.129 – 10.3.149.129	10.3.149.129
3	10.3.149.130/32	10.3.149.130 – 10.3.149.130	10.3.149.130
4	10.3.149.131/32	10.3.149.131 – 10.3.149.131	10.3.149.131
5	10.3.149.132/32	10.3.149.132 – 10.3.149.132	10.3.149.132
6	10.3.149.133/32	10.3.149.133 – 10.3.149.133	10.3.149.133
7	10.3.149.134/32	10.3.149.134 – 10.3.149.134	10.3.149.134
8	10.3.149.135/32	10.3.149.135 – 10.3.149.135	10.3.149.135
9	10.3.149.136/32	10.3.149.136 – 10.3.149.136	10.3.149.136
10	10.3.149.137/32	10.3.149.137 – 10.3.149.137	10.3.149.137
11	10.3.149.138/32	10.3.149.138 – 10.3.149.138	10.3.149.138
12	10.3.149.139/32	10.3.149.139 – 10.3.149.139	10.3.149.139
13	10.3.149.140/32	10.3.149.140 – 10.3.149.140	10.3.149.140
14	10.3.149.141/32	10.3.149.141 – 10.3.149.141	10.3.149.141
15	10.3.149.142/32	10.3.149.142 – 10.3.149.142	10.3.149.142
16	10.3.149.143/32	10.3.149.143 – 10.3.149.143	10.3.149.143
17	10.3.149.144/32	10.3.149.144 – 10.3.149.144	10.3.149.144
18	10.3.149.145/32	10.3.149.145 – 10.3.149.145	10.3.149.145
19	10.3.149.146/32	10.3.149.146 – 10.3.149.146	10.3.149.146
20	10.3.149.147/32	10.3.149.147 – 10.3.149.147	10.3.149.147
21	10.3.149.148/32	10.3.149.148 – 10.3.149.148	10.3.149.148
22	10.3.149.149/32	10.3.149.149 – 10.3.149.149	10.3.149.149
23	10.3.149.150/32	10.3.149.150 – 10.3.149.150	10.3.149.150
24	10.3.149.151/32	10.3.149.151 – 10.3.149.151	10.3.149.151
25	10.3.149.152/32	10.3.149.152 – 10.3.149.152	10.3.149.152
26	10.3.149.153/32	10.3.149.153 – 10.3.149.153	10.3.149.153
27	10.3.149.154/32	10.3.149.154 – 10.3.149.154	10.3.149.154
28	10.3.149.155/32	10.3.149.155 – 10.3.149.155	10.3.149.155
29	10.3.149.156/32	10.3.149.156 – 10.3.149.156	10.3.149.156
30	10.3.149.157/32	10.3.149.157 – 10.3.149.157	10.3.149.157
31	10.3.149.158/32	10.3.149.158 – 10.3.149.158	10.3.149.158
32	10.3.149.159/32	10.3.149.159 – 10.3.149.159	10.3.149.159
33	10.3.149.160/32	10.3.149.160 – 10.3.149.160	10.3.149.160
34	10.3.149.161/32	10.3.149.161 – 10.3.149.161	10.3.149.161
35	10.3.149.162/32	10.3.149.162 – 10.3.149.162	10.3.149.162
36	10.3.149.163/32	10.3.149.163 – 10.3.149.163	10.3.149.163
37	10.3.149.164/32	10.3.149.164 – 10.3.149.164	10.3.149.164
38	10.3.149.165/32	10.3.149.165 – 10.3.149.165	10.3.149.165
39	10.3.149.166/32	10.3.149.166 – 10.3.149.166	10.3.149.166
40	10.3.149.167/32	10.3.149.167 – 10.3.149.167	10.3.149.167
41	10.3.149.168/32	10.3.149.168 – 10.3.149.168	10.3.149.168
42	10.3.149.169/32	10.3.149.169 – 10.3.149.169	10.3.149.169
43	10.3.149.170/32	10.3.149.170 – 10.3.149.170	10.3.149.170
44	10.3.149.171/32	10.3.149.171 – 10.3.149.171	10.3.149.171
45	10.3.149.172/32	10.3.149.172 – 10.3.149.172	10.3.149.172
46	10.3.149.173/32	10.3.149.173 – 10.3.149.173	10.3.149.173
47	10.3.149.174/32	10.3.149.174 – 10.3.149.174	10.3.149.174
48	10.3.149.175/32	10.3.149.175 – 10.3.149.175	10.3.149.175
49	10.3.149.176/32	10.3.149.176 – 10.3.149.176	10.3.149.176
50	10.3.149.177/32	10.3.149.177 – 10.3.149.177	10.3.149.177
51	10.3.149.178/32	10.3.149.178 – 10.3.149.178	10.3.149.178
52	10.3.149.179/32	10.3.149.179 – 10.3.149.179	10.3.149.179
53	10.3.149.180/32	10.3.149.180 – 10.3.149.180	10.3.149.180
54	10.3.149.181/32	10.3.149.181 – 10.3.149.181	10.3.149.181
55	10.3.149.182/32	10.3.149.182 – 10.3.149.182	10.3.149.182
56	10.3.149.183/32	10.3.149.183 – 10.3.149.183	10.3.149.183
57	10.3.149.184/32	10.3.149.184 – 10.3.149.184	10.3.149.184
58	10.3.149.185/32	10.3.149.185 – 10.3.149.185	10.3.149.185
59	10.3.149.186/32	10.3.149.186 – 10.3.149.186	10.3.149.186
60	10.3.149.187/32	10.3.149.187 – 10.3.149.187	10.3.149.187
61	10.3.149.188/32	10.3.149.188 – 10.3.149.188	10.3.149.188
62	10.3.149.189/32	10.3.149.189 – 10.3.149.189	10.3.149.189
63	10.3.149.190/32	10.3.149.190 – 10.3.149.190	10.3.149.190
64	10.3.149.191/32	10.3.149.191 – 10.3.149.191	10.3.149.191
65	10.3.149.192/32	10.3.149.192 – 10.3.149.192	10.3.149.192
66	10.3.149.193/32	10.3.149.193 – 10.3.149.193	10.3.149.193
67	10.3.149.194/32	10.3.149.194 – 10.3.149.194	10.3.149.194
68	10.3.149.195/32	10.3.149.195 – 10.3.149.195	10.3.149.195
69	10.3.149.196/32	10.3.149.196 – 10.3.149.196	10.3.149.196
70	10.3.149.197/32	10.3.149.197 – 10.3.149.197	10.3.149.197
71	10.3.149.198/32	10.3.149.198 – 10.3.149.198	10.3.149.198
72	10.3.149.199/32	10.3.149.199 – 10.3.149.199	10.3.149.199
73	10.3.149.200/32	10.3.149.200 – 10.3.149.200	10.3.149.200
74	10.3.149.201/32	10.3.149.201 – 10.3.149.201	10.3.149.201
75	10.3.149.202/32	10.3.149.202 – 10.3.149.202	10.3.149.202
76	10.3.149.203/32	10.3.149.203 – 10.3.149.203	10.3.149.203
77	10.3.149.204/32	10.3.149.204 – 10.3.149.204	10.3.149.204
78	10.3.149.205/32	10.3.149.205 – 10.3.149.205	10.3.149.205
79	10.3.149.206/32	10.3.149.206 – 10.3.149.206	10.3.149.206
80	10.3.149.207/32	10.3.149.207 – 10.3.149.207	10.3.149.207
81	10.3.149.208/32	10.3.149.208 – 10.3.149.208	10.3.149.208
82	10.3.149.209/32	10.3.149.209 – 10.3.149.209	10.3.149.209
83	10.3.149.210/32	10.3.149.210 – 10.3.149.210	10.3.149.210
84	10.3.149.211/32	10.3.149.211 – 10.3.149.211	10.3.149.211
85	10.3.149.212/32	10.3.149.212 – 10.3.149.212	10.3.149.212
86	10.3.149.213/32	10.3.149.213 – 10.3.149.213	10.3.149.213
87	10.3.149.214/32	10.3.149.214 – 10.3.149.214	10.3.149.214
88	10.3.149.215/32	10.3.149.215 – 10.3.149.215	10.3.149.215
89	10.3.149.216/32	10.3.149.216 – 10.3.149.216	10.3.149.216
90	10.3.149.217/32	10.3.149.217 – 10.3.149.217	10.3.149.217
91	10.3.149.218/32	10.3.149.218 – 10.3.149.218	10.3.149.218
92	10.3.149.219/32	10.3.149.219 – 10.3.149.219	10.3.149.219
93	10.3.149.220/32	10.3.149.220 – 10.3.149.220	10.3.149.220
94	10.3.149.221/32	10.3.149.221 – 10.3.149.221	10.3.149.221
95	10.3.149.222/32	10.3.149.222 – 10.3.149.222	10.3.149.222
96	10.3.149.223/32	10.3.149.223 – 10.3.149.223	10.3.149.223
97	10.3.149.224/32	10.3.149.224 – 10.3.149.224	10.3.149.224
98	10.3.149.225/32	10.3.149.225 – 10.3.149.225	10.3.149.225
99	10.3.149.226/32	10.3.149.226 – 10.3.149.226	10.3.149.226
100	10.3.149.227/32	10.3.149.227 – 10.3.149.227	10.3.149.227
101	10.3.149.228/32	10.3.149.228 – 10.3.149.228	10.3.149.228
102	10.3.149.229/32	10.3.149.229 – 10.3.149.229	10.3.149.229
103	10.3.149.230/32	10.3.149.230 – 10.3.149.230	10.3.149.230
104	10.3.149.231/32	10.3.149.231 – 10.3.149.231	10.3.149.231
105	10.3.149.232/32	10.3.149.232 – 10.3.149.232	10.3.149.232
106	10.3.149.233/32	10.3.149.233 – 10.3.149.233	10.3.149.233
107	10.3.149.234/32	10.3.149.234 – 10.3.149.234	10.3.149.234
108	10.3.149.235/32	10.3.149.235 – 10.3.149.235	10.3.149.235
109	10.3.149.236/32	10.3.149.236 – 10.3.149.236	10.3.149.236
110	10.3.149.237/32	10.3.149.237 – 10.3.149.237	10.3.149.237
111	10.3.149.238/32	10.3.149.238 – 10.3.149.238	10.3.149.238
112	10.3.149.239/32	10.3.149.239 – 10.3.149.239	10.3.149.239
113	10.3.149.240/32	10.3.149.240 – 10.3.149.240	10.3.149.240
114	10.3.149.241/32	10.3.149.241 – 10.3.149.241	10.3.149.241
115	10.3.149.242/32	10.3.149.242 – 10.3.149.242	10.3.149.242
116	10.3.149.243/32	10.3.149.243 – 10.3.149.243	10.3.149.243
117	10.3.149.244/32	10.3.149.244 – 10.3.149.244	10.3.149.244
118	10.3.149.245/32	10.3.149.245 – 10.3.149.245	10.3.149.245
119	10.3.149.246/32	10.3.149.246 – 10.3.149.246	10.3.149.246
120	10.3.149.247/32	10.3.149.247 – 10.3.149.247	10.3.149.247
121	10.3.149.248/32	10.3.149.248 – 10.3.149.248	10.3.149.248
122	10.3.149.249/32	10.3.149.249 – 10.3.149.249	10.3.149.249
123	10.3.149.250/32	10.3.149.250 – 10.3.149.250	10.3.149.250
124	10.3.149.251/32	10.3.149.251 – 10.3.149.251	10.3.149.251
125	10.3.149.252/32	10.3.149.252 – 10.3.149.252	10.3.149.252
126	10.3.149.253/32	10.3.149.253 – 10.3.149.253	10.3.149.253
127	10.3.149.254/32	10.3.149.254 – 10.3.149.254	10.3.149.254
128	10.3.149.255/32	10.3.149.255 – 10.3.149.255	10.3.149.255

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 →