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)10.3.46.128/25

network10.3.46.128/25

broadcast10.3.46.255

first host10.3.46.129

last host10.3.46.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.46.128/25

address00001010.00000011.00101110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.00101110.10000000

broadcast00001010.00000011.00101110.11111111

green = network part, grey = host part

hex0x0a032e80

decimal167980672

reverse dns128.46.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2e80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.46.128/32	10.3.46.128 – 10.3.46.128	10.3.46.128
2	10.3.46.129/32	10.3.46.129 – 10.3.46.129	10.3.46.129
3	10.3.46.130/32	10.3.46.130 – 10.3.46.130	10.3.46.130
4	10.3.46.131/32	10.3.46.131 – 10.3.46.131	10.3.46.131
5	10.3.46.132/32	10.3.46.132 – 10.3.46.132	10.3.46.132
6	10.3.46.133/32	10.3.46.133 – 10.3.46.133	10.3.46.133
7	10.3.46.134/32	10.3.46.134 – 10.3.46.134	10.3.46.134
8	10.3.46.135/32	10.3.46.135 – 10.3.46.135	10.3.46.135
9	10.3.46.136/32	10.3.46.136 – 10.3.46.136	10.3.46.136
10	10.3.46.137/32	10.3.46.137 – 10.3.46.137	10.3.46.137
11	10.3.46.138/32	10.3.46.138 – 10.3.46.138	10.3.46.138
12	10.3.46.139/32	10.3.46.139 – 10.3.46.139	10.3.46.139
13	10.3.46.140/32	10.3.46.140 – 10.3.46.140	10.3.46.140
14	10.3.46.141/32	10.3.46.141 – 10.3.46.141	10.3.46.141
15	10.3.46.142/32	10.3.46.142 – 10.3.46.142	10.3.46.142
16	10.3.46.143/32	10.3.46.143 – 10.3.46.143	10.3.46.143
17	10.3.46.144/32	10.3.46.144 – 10.3.46.144	10.3.46.144
18	10.3.46.145/32	10.3.46.145 – 10.3.46.145	10.3.46.145
19	10.3.46.146/32	10.3.46.146 – 10.3.46.146	10.3.46.146
20	10.3.46.147/32	10.3.46.147 – 10.3.46.147	10.3.46.147
21	10.3.46.148/32	10.3.46.148 – 10.3.46.148	10.3.46.148
22	10.3.46.149/32	10.3.46.149 – 10.3.46.149	10.3.46.149
23	10.3.46.150/32	10.3.46.150 – 10.3.46.150	10.3.46.150
24	10.3.46.151/32	10.3.46.151 – 10.3.46.151	10.3.46.151
25	10.3.46.152/32	10.3.46.152 – 10.3.46.152	10.3.46.152
26	10.3.46.153/32	10.3.46.153 – 10.3.46.153	10.3.46.153
27	10.3.46.154/32	10.3.46.154 – 10.3.46.154	10.3.46.154
28	10.3.46.155/32	10.3.46.155 – 10.3.46.155	10.3.46.155
29	10.3.46.156/32	10.3.46.156 – 10.3.46.156	10.3.46.156
30	10.3.46.157/32	10.3.46.157 – 10.3.46.157	10.3.46.157
31	10.3.46.158/32	10.3.46.158 – 10.3.46.158	10.3.46.158
32	10.3.46.159/32	10.3.46.159 – 10.3.46.159	10.3.46.159
33	10.3.46.160/32	10.3.46.160 – 10.3.46.160	10.3.46.160
34	10.3.46.161/32	10.3.46.161 – 10.3.46.161	10.3.46.161
35	10.3.46.162/32	10.3.46.162 – 10.3.46.162	10.3.46.162
36	10.3.46.163/32	10.3.46.163 – 10.3.46.163	10.3.46.163
37	10.3.46.164/32	10.3.46.164 – 10.3.46.164	10.3.46.164
38	10.3.46.165/32	10.3.46.165 – 10.3.46.165	10.3.46.165
39	10.3.46.166/32	10.3.46.166 – 10.3.46.166	10.3.46.166
40	10.3.46.167/32	10.3.46.167 – 10.3.46.167	10.3.46.167
41	10.3.46.168/32	10.3.46.168 – 10.3.46.168	10.3.46.168
42	10.3.46.169/32	10.3.46.169 – 10.3.46.169	10.3.46.169
43	10.3.46.170/32	10.3.46.170 – 10.3.46.170	10.3.46.170
44	10.3.46.171/32	10.3.46.171 – 10.3.46.171	10.3.46.171
45	10.3.46.172/32	10.3.46.172 – 10.3.46.172	10.3.46.172
46	10.3.46.173/32	10.3.46.173 – 10.3.46.173	10.3.46.173
47	10.3.46.174/32	10.3.46.174 – 10.3.46.174	10.3.46.174
48	10.3.46.175/32	10.3.46.175 – 10.3.46.175	10.3.46.175
49	10.3.46.176/32	10.3.46.176 – 10.3.46.176	10.3.46.176
50	10.3.46.177/32	10.3.46.177 – 10.3.46.177	10.3.46.177
51	10.3.46.178/32	10.3.46.178 – 10.3.46.178	10.3.46.178
52	10.3.46.179/32	10.3.46.179 – 10.3.46.179	10.3.46.179
53	10.3.46.180/32	10.3.46.180 – 10.3.46.180	10.3.46.180
54	10.3.46.181/32	10.3.46.181 – 10.3.46.181	10.3.46.181
55	10.3.46.182/32	10.3.46.182 – 10.3.46.182	10.3.46.182
56	10.3.46.183/32	10.3.46.183 – 10.3.46.183	10.3.46.183
57	10.3.46.184/32	10.3.46.184 – 10.3.46.184	10.3.46.184
58	10.3.46.185/32	10.3.46.185 – 10.3.46.185	10.3.46.185
59	10.3.46.186/32	10.3.46.186 – 10.3.46.186	10.3.46.186
60	10.3.46.187/32	10.3.46.187 – 10.3.46.187	10.3.46.187
61	10.3.46.188/32	10.3.46.188 – 10.3.46.188	10.3.46.188
62	10.3.46.189/32	10.3.46.189 – 10.3.46.189	10.3.46.189
63	10.3.46.190/32	10.3.46.190 – 10.3.46.190	10.3.46.190
64	10.3.46.191/32	10.3.46.191 – 10.3.46.191	10.3.46.191
65	10.3.46.192/32	10.3.46.192 – 10.3.46.192	10.3.46.192
66	10.3.46.193/32	10.3.46.193 – 10.3.46.193	10.3.46.193
67	10.3.46.194/32	10.3.46.194 – 10.3.46.194	10.3.46.194
68	10.3.46.195/32	10.3.46.195 – 10.3.46.195	10.3.46.195
69	10.3.46.196/32	10.3.46.196 – 10.3.46.196	10.3.46.196
70	10.3.46.197/32	10.3.46.197 – 10.3.46.197	10.3.46.197
71	10.3.46.198/32	10.3.46.198 – 10.3.46.198	10.3.46.198
72	10.3.46.199/32	10.3.46.199 – 10.3.46.199	10.3.46.199
73	10.3.46.200/32	10.3.46.200 – 10.3.46.200	10.3.46.200
74	10.3.46.201/32	10.3.46.201 – 10.3.46.201	10.3.46.201
75	10.3.46.202/32	10.3.46.202 – 10.3.46.202	10.3.46.202
76	10.3.46.203/32	10.3.46.203 – 10.3.46.203	10.3.46.203
77	10.3.46.204/32	10.3.46.204 – 10.3.46.204	10.3.46.204
78	10.3.46.205/32	10.3.46.205 – 10.3.46.205	10.3.46.205
79	10.3.46.206/32	10.3.46.206 – 10.3.46.206	10.3.46.206
80	10.3.46.207/32	10.3.46.207 – 10.3.46.207	10.3.46.207
81	10.3.46.208/32	10.3.46.208 – 10.3.46.208	10.3.46.208
82	10.3.46.209/32	10.3.46.209 – 10.3.46.209	10.3.46.209
83	10.3.46.210/32	10.3.46.210 – 10.3.46.210	10.3.46.210
84	10.3.46.211/32	10.3.46.211 – 10.3.46.211	10.3.46.211
85	10.3.46.212/32	10.3.46.212 – 10.3.46.212	10.3.46.212
86	10.3.46.213/32	10.3.46.213 – 10.3.46.213	10.3.46.213
87	10.3.46.214/32	10.3.46.214 – 10.3.46.214	10.3.46.214
88	10.3.46.215/32	10.3.46.215 – 10.3.46.215	10.3.46.215
89	10.3.46.216/32	10.3.46.216 – 10.3.46.216	10.3.46.216
90	10.3.46.217/32	10.3.46.217 – 10.3.46.217	10.3.46.217
91	10.3.46.218/32	10.3.46.218 – 10.3.46.218	10.3.46.218
92	10.3.46.219/32	10.3.46.219 – 10.3.46.219	10.3.46.219
93	10.3.46.220/32	10.3.46.220 – 10.3.46.220	10.3.46.220
94	10.3.46.221/32	10.3.46.221 – 10.3.46.221	10.3.46.221
95	10.3.46.222/32	10.3.46.222 – 10.3.46.222	10.3.46.222
96	10.3.46.223/32	10.3.46.223 – 10.3.46.223	10.3.46.223
97	10.3.46.224/32	10.3.46.224 – 10.3.46.224	10.3.46.224
98	10.3.46.225/32	10.3.46.225 – 10.3.46.225	10.3.46.225
99	10.3.46.226/32	10.3.46.226 – 10.3.46.226	10.3.46.226
100	10.3.46.227/32	10.3.46.227 – 10.3.46.227	10.3.46.227
101	10.3.46.228/32	10.3.46.228 – 10.3.46.228	10.3.46.228
102	10.3.46.229/32	10.3.46.229 – 10.3.46.229	10.3.46.229
103	10.3.46.230/32	10.3.46.230 – 10.3.46.230	10.3.46.230
104	10.3.46.231/32	10.3.46.231 – 10.3.46.231	10.3.46.231
105	10.3.46.232/32	10.3.46.232 – 10.3.46.232	10.3.46.232
106	10.3.46.233/32	10.3.46.233 – 10.3.46.233	10.3.46.233
107	10.3.46.234/32	10.3.46.234 – 10.3.46.234	10.3.46.234
108	10.3.46.235/32	10.3.46.235 – 10.3.46.235	10.3.46.235
109	10.3.46.236/32	10.3.46.236 – 10.3.46.236	10.3.46.236
110	10.3.46.237/32	10.3.46.237 – 10.3.46.237	10.3.46.237
111	10.3.46.238/32	10.3.46.238 – 10.3.46.238	10.3.46.238
112	10.3.46.239/32	10.3.46.239 – 10.3.46.239	10.3.46.239
113	10.3.46.240/32	10.3.46.240 – 10.3.46.240	10.3.46.240
114	10.3.46.241/32	10.3.46.241 – 10.3.46.241	10.3.46.241
115	10.3.46.242/32	10.3.46.242 – 10.3.46.242	10.3.46.242
116	10.3.46.243/32	10.3.46.243 – 10.3.46.243	10.3.46.243
117	10.3.46.244/32	10.3.46.244 – 10.3.46.244	10.3.46.244
118	10.3.46.245/32	10.3.46.245 – 10.3.46.245	10.3.46.245
119	10.3.46.246/32	10.3.46.246 – 10.3.46.246	10.3.46.246
120	10.3.46.247/32	10.3.46.247 – 10.3.46.247	10.3.46.247
121	10.3.46.248/32	10.3.46.248 – 10.3.46.248	10.3.46.248
122	10.3.46.249/32	10.3.46.249 – 10.3.46.249	10.3.46.249
123	10.3.46.250/32	10.3.46.250 – 10.3.46.250	10.3.46.250
124	10.3.46.251/32	10.3.46.251 – 10.3.46.251	10.3.46.251
125	10.3.46.252/32	10.3.46.252 – 10.3.46.252	10.3.46.252
126	10.3.46.253/32	10.3.46.253 – 10.3.46.253	10.3.46.253
127	10.3.46.254/32	10.3.46.254 – 10.3.46.254	10.3.46.254
128	10.3.46.255/32	10.3.46.255 – 10.3.46.255	10.3.46.255

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 →