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)10.0.105.128/25

network10.0.105.128/25

broadcast10.0.105.255

first host10.0.105.129

last host10.0.105.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.105.128/25

address00001010.00000000.01101001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01101001.10000000

broadcast00001010.00000000.01101001.11111111

green = network part, grey = host part

hex0x0a006980

decimal167799168

reverse dns128.105.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6980

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.105.128/32	10.0.105.128 – 10.0.105.128	10.0.105.128
2	10.0.105.129/32	10.0.105.129 – 10.0.105.129	10.0.105.129
3	10.0.105.130/32	10.0.105.130 – 10.0.105.130	10.0.105.130
4	10.0.105.131/32	10.0.105.131 – 10.0.105.131	10.0.105.131
5	10.0.105.132/32	10.0.105.132 – 10.0.105.132	10.0.105.132
6	10.0.105.133/32	10.0.105.133 – 10.0.105.133	10.0.105.133
7	10.0.105.134/32	10.0.105.134 – 10.0.105.134	10.0.105.134
8	10.0.105.135/32	10.0.105.135 – 10.0.105.135	10.0.105.135
9	10.0.105.136/32	10.0.105.136 – 10.0.105.136	10.0.105.136
10	10.0.105.137/32	10.0.105.137 – 10.0.105.137	10.0.105.137
11	10.0.105.138/32	10.0.105.138 – 10.0.105.138	10.0.105.138
12	10.0.105.139/32	10.0.105.139 – 10.0.105.139	10.0.105.139
13	10.0.105.140/32	10.0.105.140 – 10.0.105.140	10.0.105.140
14	10.0.105.141/32	10.0.105.141 – 10.0.105.141	10.0.105.141
15	10.0.105.142/32	10.0.105.142 – 10.0.105.142	10.0.105.142
16	10.0.105.143/32	10.0.105.143 – 10.0.105.143	10.0.105.143
17	10.0.105.144/32	10.0.105.144 – 10.0.105.144	10.0.105.144
18	10.0.105.145/32	10.0.105.145 – 10.0.105.145	10.0.105.145
19	10.0.105.146/32	10.0.105.146 – 10.0.105.146	10.0.105.146
20	10.0.105.147/32	10.0.105.147 – 10.0.105.147	10.0.105.147
21	10.0.105.148/32	10.0.105.148 – 10.0.105.148	10.0.105.148
22	10.0.105.149/32	10.0.105.149 – 10.0.105.149	10.0.105.149
23	10.0.105.150/32	10.0.105.150 – 10.0.105.150	10.0.105.150
24	10.0.105.151/32	10.0.105.151 – 10.0.105.151	10.0.105.151
25	10.0.105.152/32	10.0.105.152 – 10.0.105.152	10.0.105.152
26	10.0.105.153/32	10.0.105.153 – 10.0.105.153	10.0.105.153
27	10.0.105.154/32	10.0.105.154 – 10.0.105.154	10.0.105.154
28	10.0.105.155/32	10.0.105.155 – 10.0.105.155	10.0.105.155
29	10.0.105.156/32	10.0.105.156 – 10.0.105.156	10.0.105.156
30	10.0.105.157/32	10.0.105.157 – 10.0.105.157	10.0.105.157
31	10.0.105.158/32	10.0.105.158 – 10.0.105.158	10.0.105.158
32	10.0.105.159/32	10.0.105.159 – 10.0.105.159	10.0.105.159
33	10.0.105.160/32	10.0.105.160 – 10.0.105.160	10.0.105.160
34	10.0.105.161/32	10.0.105.161 – 10.0.105.161	10.0.105.161
35	10.0.105.162/32	10.0.105.162 – 10.0.105.162	10.0.105.162
36	10.0.105.163/32	10.0.105.163 – 10.0.105.163	10.0.105.163
37	10.0.105.164/32	10.0.105.164 – 10.0.105.164	10.0.105.164
38	10.0.105.165/32	10.0.105.165 – 10.0.105.165	10.0.105.165
39	10.0.105.166/32	10.0.105.166 – 10.0.105.166	10.0.105.166
40	10.0.105.167/32	10.0.105.167 – 10.0.105.167	10.0.105.167
41	10.0.105.168/32	10.0.105.168 – 10.0.105.168	10.0.105.168
42	10.0.105.169/32	10.0.105.169 – 10.0.105.169	10.0.105.169
43	10.0.105.170/32	10.0.105.170 – 10.0.105.170	10.0.105.170
44	10.0.105.171/32	10.0.105.171 – 10.0.105.171	10.0.105.171
45	10.0.105.172/32	10.0.105.172 – 10.0.105.172	10.0.105.172
46	10.0.105.173/32	10.0.105.173 – 10.0.105.173	10.0.105.173
47	10.0.105.174/32	10.0.105.174 – 10.0.105.174	10.0.105.174
48	10.0.105.175/32	10.0.105.175 – 10.0.105.175	10.0.105.175
49	10.0.105.176/32	10.0.105.176 – 10.0.105.176	10.0.105.176
50	10.0.105.177/32	10.0.105.177 – 10.0.105.177	10.0.105.177
51	10.0.105.178/32	10.0.105.178 – 10.0.105.178	10.0.105.178
52	10.0.105.179/32	10.0.105.179 – 10.0.105.179	10.0.105.179
53	10.0.105.180/32	10.0.105.180 – 10.0.105.180	10.0.105.180
54	10.0.105.181/32	10.0.105.181 – 10.0.105.181	10.0.105.181
55	10.0.105.182/32	10.0.105.182 – 10.0.105.182	10.0.105.182
56	10.0.105.183/32	10.0.105.183 – 10.0.105.183	10.0.105.183
57	10.0.105.184/32	10.0.105.184 – 10.0.105.184	10.0.105.184
58	10.0.105.185/32	10.0.105.185 – 10.0.105.185	10.0.105.185
59	10.0.105.186/32	10.0.105.186 – 10.0.105.186	10.0.105.186
60	10.0.105.187/32	10.0.105.187 – 10.0.105.187	10.0.105.187
61	10.0.105.188/32	10.0.105.188 – 10.0.105.188	10.0.105.188
62	10.0.105.189/32	10.0.105.189 – 10.0.105.189	10.0.105.189
63	10.0.105.190/32	10.0.105.190 – 10.0.105.190	10.0.105.190
64	10.0.105.191/32	10.0.105.191 – 10.0.105.191	10.0.105.191
65	10.0.105.192/32	10.0.105.192 – 10.0.105.192	10.0.105.192
66	10.0.105.193/32	10.0.105.193 – 10.0.105.193	10.0.105.193
67	10.0.105.194/32	10.0.105.194 – 10.0.105.194	10.0.105.194
68	10.0.105.195/32	10.0.105.195 – 10.0.105.195	10.0.105.195
69	10.0.105.196/32	10.0.105.196 – 10.0.105.196	10.0.105.196
70	10.0.105.197/32	10.0.105.197 – 10.0.105.197	10.0.105.197
71	10.0.105.198/32	10.0.105.198 – 10.0.105.198	10.0.105.198
72	10.0.105.199/32	10.0.105.199 – 10.0.105.199	10.0.105.199
73	10.0.105.200/32	10.0.105.200 – 10.0.105.200	10.0.105.200
74	10.0.105.201/32	10.0.105.201 – 10.0.105.201	10.0.105.201
75	10.0.105.202/32	10.0.105.202 – 10.0.105.202	10.0.105.202
76	10.0.105.203/32	10.0.105.203 – 10.0.105.203	10.0.105.203
77	10.0.105.204/32	10.0.105.204 – 10.0.105.204	10.0.105.204
78	10.0.105.205/32	10.0.105.205 – 10.0.105.205	10.0.105.205
79	10.0.105.206/32	10.0.105.206 – 10.0.105.206	10.0.105.206
80	10.0.105.207/32	10.0.105.207 – 10.0.105.207	10.0.105.207
81	10.0.105.208/32	10.0.105.208 – 10.0.105.208	10.0.105.208
82	10.0.105.209/32	10.0.105.209 – 10.0.105.209	10.0.105.209
83	10.0.105.210/32	10.0.105.210 – 10.0.105.210	10.0.105.210
84	10.0.105.211/32	10.0.105.211 – 10.0.105.211	10.0.105.211
85	10.0.105.212/32	10.0.105.212 – 10.0.105.212	10.0.105.212
86	10.0.105.213/32	10.0.105.213 – 10.0.105.213	10.0.105.213
87	10.0.105.214/32	10.0.105.214 – 10.0.105.214	10.0.105.214
88	10.0.105.215/32	10.0.105.215 – 10.0.105.215	10.0.105.215
89	10.0.105.216/32	10.0.105.216 – 10.0.105.216	10.0.105.216
90	10.0.105.217/32	10.0.105.217 – 10.0.105.217	10.0.105.217
91	10.0.105.218/32	10.0.105.218 – 10.0.105.218	10.0.105.218
92	10.0.105.219/32	10.0.105.219 – 10.0.105.219	10.0.105.219
93	10.0.105.220/32	10.0.105.220 – 10.0.105.220	10.0.105.220
94	10.0.105.221/32	10.0.105.221 – 10.0.105.221	10.0.105.221
95	10.0.105.222/32	10.0.105.222 – 10.0.105.222	10.0.105.222
96	10.0.105.223/32	10.0.105.223 – 10.0.105.223	10.0.105.223
97	10.0.105.224/32	10.0.105.224 – 10.0.105.224	10.0.105.224
98	10.0.105.225/32	10.0.105.225 – 10.0.105.225	10.0.105.225
99	10.0.105.226/32	10.0.105.226 – 10.0.105.226	10.0.105.226
100	10.0.105.227/32	10.0.105.227 – 10.0.105.227	10.0.105.227
101	10.0.105.228/32	10.0.105.228 – 10.0.105.228	10.0.105.228
102	10.0.105.229/32	10.0.105.229 – 10.0.105.229	10.0.105.229
103	10.0.105.230/32	10.0.105.230 – 10.0.105.230	10.0.105.230
104	10.0.105.231/32	10.0.105.231 – 10.0.105.231	10.0.105.231
105	10.0.105.232/32	10.0.105.232 – 10.0.105.232	10.0.105.232
106	10.0.105.233/32	10.0.105.233 – 10.0.105.233	10.0.105.233
107	10.0.105.234/32	10.0.105.234 – 10.0.105.234	10.0.105.234
108	10.0.105.235/32	10.0.105.235 – 10.0.105.235	10.0.105.235
109	10.0.105.236/32	10.0.105.236 – 10.0.105.236	10.0.105.236
110	10.0.105.237/32	10.0.105.237 – 10.0.105.237	10.0.105.237
111	10.0.105.238/32	10.0.105.238 – 10.0.105.238	10.0.105.238
112	10.0.105.239/32	10.0.105.239 – 10.0.105.239	10.0.105.239
113	10.0.105.240/32	10.0.105.240 – 10.0.105.240	10.0.105.240
114	10.0.105.241/32	10.0.105.241 – 10.0.105.241	10.0.105.241
115	10.0.105.242/32	10.0.105.242 – 10.0.105.242	10.0.105.242
116	10.0.105.243/32	10.0.105.243 – 10.0.105.243	10.0.105.243
117	10.0.105.244/32	10.0.105.244 – 10.0.105.244	10.0.105.244
118	10.0.105.245/32	10.0.105.245 – 10.0.105.245	10.0.105.245
119	10.0.105.246/32	10.0.105.246 – 10.0.105.246	10.0.105.246
120	10.0.105.247/32	10.0.105.247 – 10.0.105.247	10.0.105.247
121	10.0.105.248/32	10.0.105.248 – 10.0.105.248	10.0.105.248
122	10.0.105.249/32	10.0.105.249 – 10.0.105.249	10.0.105.249
123	10.0.105.250/32	10.0.105.250 – 10.0.105.250	10.0.105.250
124	10.0.105.251/32	10.0.105.251 – 10.0.105.251	10.0.105.251
125	10.0.105.252/32	10.0.105.252 – 10.0.105.252	10.0.105.252
126	10.0.105.253/32	10.0.105.253 – 10.0.105.253	10.0.105.253
127	10.0.105.254/32	10.0.105.254 – 10.0.105.254	10.0.105.254
128	10.0.105.255/32	10.0.105.255 – 10.0.105.255	10.0.105.255

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 →