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)10.80.78.128/25

network10.80.78.128/25

broadcast10.80.78.255

first host10.80.78.129

last host10.80.78.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.80.78.128/25

address00001010.01010000.01001110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01010000.01001110.10000000

broadcast00001010.01010000.01001110.11111111

green = network part, grey = host part

hex0x0a504e80

decimal173035136

reverse dns128.78.80.10.in-addr.arpa

ipv4-mapped::ffff:a50:4e80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.80.78.128/32	10.80.78.128 – 10.80.78.128	10.80.78.128
2	10.80.78.129/32	10.80.78.129 – 10.80.78.129	10.80.78.129
3	10.80.78.130/32	10.80.78.130 – 10.80.78.130	10.80.78.130
4	10.80.78.131/32	10.80.78.131 – 10.80.78.131	10.80.78.131
5	10.80.78.132/32	10.80.78.132 – 10.80.78.132	10.80.78.132
6	10.80.78.133/32	10.80.78.133 – 10.80.78.133	10.80.78.133
7	10.80.78.134/32	10.80.78.134 – 10.80.78.134	10.80.78.134
8	10.80.78.135/32	10.80.78.135 – 10.80.78.135	10.80.78.135
9	10.80.78.136/32	10.80.78.136 – 10.80.78.136	10.80.78.136
10	10.80.78.137/32	10.80.78.137 – 10.80.78.137	10.80.78.137
11	10.80.78.138/32	10.80.78.138 – 10.80.78.138	10.80.78.138
12	10.80.78.139/32	10.80.78.139 – 10.80.78.139	10.80.78.139
13	10.80.78.140/32	10.80.78.140 – 10.80.78.140	10.80.78.140
14	10.80.78.141/32	10.80.78.141 – 10.80.78.141	10.80.78.141
15	10.80.78.142/32	10.80.78.142 – 10.80.78.142	10.80.78.142
16	10.80.78.143/32	10.80.78.143 – 10.80.78.143	10.80.78.143
17	10.80.78.144/32	10.80.78.144 – 10.80.78.144	10.80.78.144
18	10.80.78.145/32	10.80.78.145 – 10.80.78.145	10.80.78.145
19	10.80.78.146/32	10.80.78.146 – 10.80.78.146	10.80.78.146
20	10.80.78.147/32	10.80.78.147 – 10.80.78.147	10.80.78.147
21	10.80.78.148/32	10.80.78.148 – 10.80.78.148	10.80.78.148
22	10.80.78.149/32	10.80.78.149 – 10.80.78.149	10.80.78.149
23	10.80.78.150/32	10.80.78.150 – 10.80.78.150	10.80.78.150
24	10.80.78.151/32	10.80.78.151 – 10.80.78.151	10.80.78.151
25	10.80.78.152/32	10.80.78.152 – 10.80.78.152	10.80.78.152
26	10.80.78.153/32	10.80.78.153 – 10.80.78.153	10.80.78.153
27	10.80.78.154/32	10.80.78.154 – 10.80.78.154	10.80.78.154
28	10.80.78.155/32	10.80.78.155 – 10.80.78.155	10.80.78.155
29	10.80.78.156/32	10.80.78.156 – 10.80.78.156	10.80.78.156
30	10.80.78.157/32	10.80.78.157 – 10.80.78.157	10.80.78.157
31	10.80.78.158/32	10.80.78.158 – 10.80.78.158	10.80.78.158
32	10.80.78.159/32	10.80.78.159 – 10.80.78.159	10.80.78.159
33	10.80.78.160/32	10.80.78.160 – 10.80.78.160	10.80.78.160
34	10.80.78.161/32	10.80.78.161 – 10.80.78.161	10.80.78.161
35	10.80.78.162/32	10.80.78.162 – 10.80.78.162	10.80.78.162
36	10.80.78.163/32	10.80.78.163 – 10.80.78.163	10.80.78.163
37	10.80.78.164/32	10.80.78.164 – 10.80.78.164	10.80.78.164
38	10.80.78.165/32	10.80.78.165 – 10.80.78.165	10.80.78.165
39	10.80.78.166/32	10.80.78.166 – 10.80.78.166	10.80.78.166
40	10.80.78.167/32	10.80.78.167 – 10.80.78.167	10.80.78.167
41	10.80.78.168/32	10.80.78.168 – 10.80.78.168	10.80.78.168
42	10.80.78.169/32	10.80.78.169 – 10.80.78.169	10.80.78.169
43	10.80.78.170/32	10.80.78.170 – 10.80.78.170	10.80.78.170
44	10.80.78.171/32	10.80.78.171 – 10.80.78.171	10.80.78.171
45	10.80.78.172/32	10.80.78.172 – 10.80.78.172	10.80.78.172
46	10.80.78.173/32	10.80.78.173 – 10.80.78.173	10.80.78.173
47	10.80.78.174/32	10.80.78.174 – 10.80.78.174	10.80.78.174
48	10.80.78.175/32	10.80.78.175 – 10.80.78.175	10.80.78.175
49	10.80.78.176/32	10.80.78.176 – 10.80.78.176	10.80.78.176
50	10.80.78.177/32	10.80.78.177 – 10.80.78.177	10.80.78.177
51	10.80.78.178/32	10.80.78.178 – 10.80.78.178	10.80.78.178
52	10.80.78.179/32	10.80.78.179 – 10.80.78.179	10.80.78.179
53	10.80.78.180/32	10.80.78.180 – 10.80.78.180	10.80.78.180
54	10.80.78.181/32	10.80.78.181 – 10.80.78.181	10.80.78.181
55	10.80.78.182/32	10.80.78.182 – 10.80.78.182	10.80.78.182
56	10.80.78.183/32	10.80.78.183 – 10.80.78.183	10.80.78.183
57	10.80.78.184/32	10.80.78.184 – 10.80.78.184	10.80.78.184
58	10.80.78.185/32	10.80.78.185 – 10.80.78.185	10.80.78.185
59	10.80.78.186/32	10.80.78.186 – 10.80.78.186	10.80.78.186
60	10.80.78.187/32	10.80.78.187 – 10.80.78.187	10.80.78.187
61	10.80.78.188/32	10.80.78.188 – 10.80.78.188	10.80.78.188
62	10.80.78.189/32	10.80.78.189 – 10.80.78.189	10.80.78.189
63	10.80.78.190/32	10.80.78.190 – 10.80.78.190	10.80.78.190
64	10.80.78.191/32	10.80.78.191 – 10.80.78.191	10.80.78.191
65	10.80.78.192/32	10.80.78.192 – 10.80.78.192	10.80.78.192
66	10.80.78.193/32	10.80.78.193 – 10.80.78.193	10.80.78.193
67	10.80.78.194/32	10.80.78.194 – 10.80.78.194	10.80.78.194
68	10.80.78.195/32	10.80.78.195 – 10.80.78.195	10.80.78.195
69	10.80.78.196/32	10.80.78.196 – 10.80.78.196	10.80.78.196
70	10.80.78.197/32	10.80.78.197 – 10.80.78.197	10.80.78.197
71	10.80.78.198/32	10.80.78.198 – 10.80.78.198	10.80.78.198
72	10.80.78.199/32	10.80.78.199 – 10.80.78.199	10.80.78.199
73	10.80.78.200/32	10.80.78.200 – 10.80.78.200	10.80.78.200
74	10.80.78.201/32	10.80.78.201 – 10.80.78.201	10.80.78.201
75	10.80.78.202/32	10.80.78.202 – 10.80.78.202	10.80.78.202
76	10.80.78.203/32	10.80.78.203 – 10.80.78.203	10.80.78.203
77	10.80.78.204/32	10.80.78.204 – 10.80.78.204	10.80.78.204
78	10.80.78.205/32	10.80.78.205 – 10.80.78.205	10.80.78.205
79	10.80.78.206/32	10.80.78.206 – 10.80.78.206	10.80.78.206
80	10.80.78.207/32	10.80.78.207 – 10.80.78.207	10.80.78.207
81	10.80.78.208/32	10.80.78.208 – 10.80.78.208	10.80.78.208
82	10.80.78.209/32	10.80.78.209 – 10.80.78.209	10.80.78.209
83	10.80.78.210/32	10.80.78.210 – 10.80.78.210	10.80.78.210
84	10.80.78.211/32	10.80.78.211 – 10.80.78.211	10.80.78.211
85	10.80.78.212/32	10.80.78.212 – 10.80.78.212	10.80.78.212
86	10.80.78.213/32	10.80.78.213 – 10.80.78.213	10.80.78.213
87	10.80.78.214/32	10.80.78.214 – 10.80.78.214	10.80.78.214
88	10.80.78.215/32	10.80.78.215 – 10.80.78.215	10.80.78.215
89	10.80.78.216/32	10.80.78.216 – 10.80.78.216	10.80.78.216
90	10.80.78.217/32	10.80.78.217 – 10.80.78.217	10.80.78.217
91	10.80.78.218/32	10.80.78.218 – 10.80.78.218	10.80.78.218
92	10.80.78.219/32	10.80.78.219 – 10.80.78.219	10.80.78.219
93	10.80.78.220/32	10.80.78.220 – 10.80.78.220	10.80.78.220
94	10.80.78.221/32	10.80.78.221 – 10.80.78.221	10.80.78.221
95	10.80.78.222/32	10.80.78.222 – 10.80.78.222	10.80.78.222
96	10.80.78.223/32	10.80.78.223 – 10.80.78.223	10.80.78.223
97	10.80.78.224/32	10.80.78.224 – 10.80.78.224	10.80.78.224
98	10.80.78.225/32	10.80.78.225 – 10.80.78.225	10.80.78.225
99	10.80.78.226/32	10.80.78.226 – 10.80.78.226	10.80.78.226
100	10.80.78.227/32	10.80.78.227 – 10.80.78.227	10.80.78.227
101	10.80.78.228/32	10.80.78.228 – 10.80.78.228	10.80.78.228
102	10.80.78.229/32	10.80.78.229 – 10.80.78.229	10.80.78.229
103	10.80.78.230/32	10.80.78.230 – 10.80.78.230	10.80.78.230
104	10.80.78.231/32	10.80.78.231 – 10.80.78.231	10.80.78.231
105	10.80.78.232/32	10.80.78.232 – 10.80.78.232	10.80.78.232
106	10.80.78.233/32	10.80.78.233 – 10.80.78.233	10.80.78.233
107	10.80.78.234/32	10.80.78.234 – 10.80.78.234	10.80.78.234
108	10.80.78.235/32	10.80.78.235 – 10.80.78.235	10.80.78.235
109	10.80.78.236/32	10.80.78.236 – 10.80.78.236	10.80.78.236
110	10.80.78.237/32	10.80.78.237 – 10.80.78.237	10.80.78.237
111	10.80.78.238/32	10.80.78.238 – 10.80.78.238	10.80.78.238
112	10.80.78.239/32	10.80.78.239 – 10.80.78.239	10.80.78.239
113	10.80.78.240/32	10.80.78.240 – 10.80.78.240	10.80.78.240
114	10.80.78.241/32	10.80.78.241 – 10.80.78.241	10.80.78.241
115	10.80.78.242/32	10.80.78.242 – 10.80.78.242	10.80.78.242
116	10.80.78.243/32	10.80.78.243 – 10.80.78.243	10.80.78.243
117	10.80.78.244/32	10.80.78.244 – 10.80.78.244	10.80.78.244
118	10.80.78.245/32	10.80.78.245 – 10.80.78.245	10.80.78.245
119	10.80.78.246/32	10.80.78.246 – 10.80.78.246	10.80.78.246
120	10.80.78.247/32	10.80.78.247 – 10.80.78.247	10.80.78.247
121	10.80.78.248/32	10.80.78.248 – 10.80.78.248	10.80.78.248
122	10.80.78.249/32	10.80.78.249 – 10.80.78.249	10.80.78.249
123	10.80.78.250/32	10.80.78.250 – 10.80.78.250	10.80.78.250
124	10.80.78.251/32	10.80.78.251 – 10.80.78.251	10.80.78.251
125	10.80.78.252/32	10.80.78.252 – 10.80.78.252	10.80.78.252
126	10.80.78.253/32	10.80.78.253 – 10.80.78.253	10.80.78.253
127	10.80.78.254/32	10.80.78.254 – 10.80.78.254	10.80.78.254
128	10.80.78.255/32	10.80.78.255 – 10.80.78.255	10.80.78.255

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 →