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)10.0.79.128/25

network10.0.79.128/25

broadcast10.0.79.255

first host10.0.79.129

last host10.0.79.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.79.128/25

address00001010.00000000.01001111.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01001111.10000000

broadcast00001010.00000000.01001111.11111111

green = network part, grey = host part

hex0x0a004f80

decimal167792512

reverse dns128.79.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:4f80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.79.128/32	10.0.79.128 – 10.0.79.128	10.0.79.128
2	10.0.79.129/32	10.0.79.129 – 10.0.79.129	10.0.79.129
3	10.0.79.130/32	10.0.79.130 – 10.0.79.130	10.0.79.130
4	10.0.79.131/32	10.0.79.131 – 10.0.79.131	10.0.79.131
5	10.0.79.132/32	10.0.79.132 – 10.0.79.132	10.0.79.132
6	10.0.79.133/32	10.0.79.133 – 10.0.79.133	10.0.79.133
7	10.0.79.134/32	10.0.79.134 – 10.0.79.134	10.0.79.134
8	10.0.79.135/32	10.0.79.135 – 10.0.79.135	10.0.79.135
9	10.0.79.136/32	10.0.79.136 – 10.0.79.136	10.0.79.136
10	10.0.79.137/32	10.0.79.137 – 10.0.79.137	10.0.79.137
11	10.0.79.138/32	10.0.79.138 – 10.0.79.138	10.0.79.138
12	10.0.79.139/32	10.0.79.139 – 10.0.79.139	10.0.79.139
13	10.0.79.140/32	10.0.79.140 – 10.0.79.140	10.0.79.140
14	10.0.79.141/32	10.0.79.141 – 10.0.79.141	10.0.79.141
15	10.0.79.142/32	10.0.79.142 – 10.0.79.142	10.0.79.142
16	10.0.79.143/32	10.0.79.143 – 10.0.79.143	10.0.79.143
17	10.0.79.144/32	10.0.79.144 – 10.0.79.144	10.0.79.144
18	10.0.79.145/32	10.0.79.145 – 10.0.79.145	10.0.79.145
19	10.0.79.146/32	10.0.79.146 – 10.0.79.146	10.0.79.146
20	10.0.79.147/32	10.0.79.147 – 10.0.79.147	10.0.79.147
21	10.0.79.148/32	10.0.79.148 – 10.0.79.148	10.0.79.148
22	10.0.79.149/32	10.0.79.149 – 10.0.79.149	10.0.79.149
23	10.0.79.150/32	10.0.79.150 – 10.0.79.150	10.0.79.150
24	10.0.79.151/32	10.0.79.151 – 10.0.79.151	10.0.79.151
25	10.0.79.152/32	10.0.79.152 – 10.0.79.152	10.0.79.152
26	10.0.79.153/32	10.0.79.153 – 10.0.79.153	10.0.79.153
27	10.0.79.154/32	10.0.79.154 – 10.0.79.154	10.0.79.154
28	10.0.79.155/32	10.0.79.155 – 10.0.79.155	10.0.79.155
29	10.0.79.156/32	10.0.79.156 – 10.0.79.156	10.0.79.156
30	10.0.79.157/32	10.0.79.157 – 10.0.79.157	10.0.79.157
31	10.0.79.158/32	10.0.79.158 – 10.0.79.158	10.0.79.158
32	10.0.79.159/32	10.0.79.159 – 10.0.79.159	10.0.79.159
33	10.0.79.160/32	10.0.79.160 – 10.0.79.160	10.0.79.160
34	10.0.79.161/32	10.0.79.161 – 10.0.79.161	10.0.79.161
35	10.0.79.162/32	10.0.79.162 – 10.0.79.162	10.0.79.162
36	10.0.79.163/32	10.0.79.163 – 10.0.79.163	10.0.79.163
37	10.0.79.164/32	10.0.79.164 – 10.0.79.164	10.0.79.164
38	10.0.79.165/32	10.0.79.165 – 10.0.79.165	10.0.79.165
39	10.0.79.166/32	10.0.79.166 – 10.0.79.166	10.0.79.166
40	10.0.79.167/32	10.0.79.167 – 10.0.79.167	10.0.79.167
41	10.0.79.168/32	10.0.79.168 – 10.0.79.168	10.0.79.168
42	10.0.79.169/32	10.0.79.169 – 10.0.79.169	10.0.79.169
43	10.0.79.170/32	10.0.79.170 – 10.0.79.170	10.0.79.170
44	10.0.79.171/32	10.0.79.171 – 10.0.79.171	10.0.79.171
45	10.0.79.172/32	10.0.79.172 – 10.0.79.172	10.0.79.172
46	10.0.79.173/32	10.0.79.173 – 10.0.79.173	10.0.79.173
47	10.0.79.174/32	10.0.79.174 – 10.0.79.174	10.0.79.174
48	10.0.79.175/32	10.0.79.175 – 10.0.79.175	10.0.79.175
49	10.0.79.176/32	10.0.79.176 – 10.0.79.176	10.0.79.176
50	10.0.79.177/32	10.0.79.177 – 10.0.79.177	10.0.79.177
51	10.0.79.178/32	10.0.79.178 – 10.0.79.178	10.0.79.178
52	10.0.79.179/32	10.0.79.179 – 10.0.79.179	10.0.79.179
53	10.0.79.180/32	10.0.79.180 – 10.0.79.180	10.0.79.180
54	10.0.79.181/32	10.0.79.181 – 10.0.79.181	10.0.79.181
55	10.0.79.182/32	10.0.79.182 – 10.0.79.182	10.0.79.182
56	10.0.79.183/32	10.0.79.183 – 10.0.79.183	10.0.79.183
57	10.0.79.184/32	10.0.79.184 – 10.0.79.184	10.0.79.184
58	10.0.79.185/32	10.0.79.185 – 10.0.79.185	10.0.79.185
59	10.0.79.186/32	10.0.79.186 – 10.0.79.186	10.0.79.186
60	10.0.79.187/32	10.0.79.187 – 10.0.79.187	10.0.79.187
61	10.0.79.188/32	10.0.79.188 – 10.0.79.188	10.0.79.188
62	10.0.79.189/32	10.0.79.189 – 10.0.79.189	10.0.79.189
63	10.0.79.190/32	10.0.79.190 – 10.0.79.190	10.0.79.190
64	10.0.79.191/32	10.0.79.191 – 10.0.79.191	10.0.79.191
65	10.0.79.192/32	10.0.79.192 – 10.0.79.192	10.0.79.192
66	10.0.79.193/32	10.0.79.193 – 10.0.79.193	10.0.79.193
67	10.0.79.194/32	10.0.79.194 – 10.0.79.194	10.0.79.194
68	10.0.79.195/32	10.0.79.195 – 10.0.79.195	10.0.79.195
69	10.0.79.196/32	10.0.79.196 – 10.0.79.196	10.0.79.196
70	10.0.79.197/32	10.0.79.197 – 10.0.79.197	10.0.79.197
71	10.0.79.198/32	10.0.79.198 – 10.0.79.198	10.0.79.198
72	10.0.79.199/32	10.0.79.199 – 10.0.79.199	10.0.79.199
73	10.0.79.200/32	10.0.79.200 – 10.0.79.200	10.0.79.200
74	10.0.79.201/32	10.0.79.201 – 10.0.79.201	10.0.79.201
75	10.0.79.202/32	10.0.79.202 – 10.0.79.202	10.0.79.202
76	10.0.79.203/32	10.0.79.203 – 10.0.79.203	10.0.79.203
77	10.0.79.204/32	10.0.79.204 – 10.0.79.204	10.0.79.204
78	10.0.79.205/32	10.0.79.205 – 10.0.79.205	10.0.79.205
79	10.0.79.206/32	10.0.79.206 – 10.0.79.206	10.0.79.206
80	10.0.79.207/32	10.0.79.207 – 10.0.79.207	10.0.79.207
81	10.0.79.208/32	10.0.79.208 – 10.0.79.208	10.0.79.208
82	10.0.79.209/32	10.0.79.209 – 10.0.79.209	10.0.79.209
83	10.0.79.210/32	10.0.79.210 – 10.0.79.210	10.0.79.210
84	10.0.79.211/32	10.0.79.211 – 10.0.79.211	10.0.79.211
85	10.0.79.212/32	10.0.79.212 – 10.0.79.212	10.0.79.212
86	10.0.79.213/32	10.0.79.213 – 10.0.79.213	10.0.79.213
87	10.0.79.214/32	10.0.79.214 – 10.0.79.214	10.0.79.214
88	10.0.79.215/32	10.0.79.215 – 10.0.79.215	10.0.79.215
89	10.0.79.216/32	10.0.79.216 – 10.0.79.216	10.0.79.216
90	10.0.79.217/32	10.0.79.217 – 10.0.79.217	10.0.79.217
91	10.0.79.218/32	10.0.79.218 – 10.0.79.218	10.0.79.218
92	10.0.79.219/32	10.0.79.219 – 10.0.79.219	10.0.79.219
93	10.0.79.220/32	10.0.79.220 – 10.0.79.220	10.0.79.220
94	10.0.79.221/32	10.0.79.221 – 10.0.79.221	10.0.79.221
95	10.0.79.222/32	10.0.79.222 – 10.0.79.222	10.0.79.222
96	10.0.79.223/32	10.0.79.223 – 10.0.79.223	10.0.79.223
97	10.0.79.224/32	10.0.79.224 – 10.0.79.224	10.0.79.224
98	10.0.79.225/32	10.0.79.225 – 10.0.79.225	10.0.79.225
99	10.0.79.226/32	10.0.79.226 – 10.0.79.226	10.0.79.226
100	10.0.79.227/32	10.0.79.227 – 10.0.79.227	10.0.79.227
101	10.0.79.228/32	10.0.79.228 – 10.0.79.228	10.0.79.228
102	10.0.79.229/32	10.0.79.229 – 10.0.79.229	10.0.79.229
103	10.0.79.230/32	10.0.79.230 – 10.0.79.230	10.0.79.230
104	10.0.79.231/32	10.0.79.231 – 10.0.79.231	10.0.79.231
105	10.0.79.232/32	10.0.79.232 – 10.0.79.232	10.0.79.232
106	10.0.79.233/32	10.0.79.233 – 10.0.79.233	10.0.79.233
107	10.0.79.234/32	10.0.79.234 – 10.0.79.234	10.0.79.234
108	10.0.79.235/32	10.0.79.235 – 10.0.79.235	10.0.79.235
109	10.0.79.236/32	10.0.79.236 – 10.0.79.236	10.0.79.236
110	10.0.79.237/32	10.0.79.237 – 10.0.79.237	10.0.79.237
111	10.0.79.238/32	10.0.79.238 – 10.0.79.238	10.0.79.238
112	10.0.79.239/32	10.0.79.239 – 10.0.79.239	10.0.79.239
113	10.0.79.240/32	10.0.79.240 – 10.0.79.240	10.0.79.240
114	10.0.79.241/32	10.0.79.241 – 10.0.79.241	10.0.79.241
115	10.0.79.242/32	10.0.79.242 – 10.0.79.242	10.0.79.242
116	10.0.79.243/32	10.0.79.243 – 10.0.79.243	10.0.79.243
117	10.0.79.244/32	10.0.79.244 – 10.0.79.244	10.0.79.244
118	10.0.79.245/32	10.0.79.245 – 10.0.79.245	10.0.79.245
119	10.0.79.246/32	10.0.79.246 – 10.0.79.246	10.0.79.246
120	10.0.79.247/32	10.0.79.247 – 10.0.79.247	10.0.79.247
121	10.0.79.248/32	10.0.79.248 – 10.0.79.248	10.0.79.248
122	10.0.79.249/32	10.0.79.249 – 10.0.79.249	10.0.79.249
123	10.0.79.250/32	10.0.79.250 – 10.0.79.250	10.0.79.250
124	10.0.79.251/32	10.0.79.251 – 10.0.79.251	10.0.79.251
125	10.0.79.252/32	10.0.79.252 – 10.0.79.252	10.0.79.252
126	10.0.79.253/32	10.0.79.253 – 10.0.79.253	10.0.79.253
127	10.0.79.254/32	10.0.79.254 – 10.0.79.254	10.0.79.254
128	10.0.79.255/32	10.0.79.255 – 10.0.79.255	10.0.79.255

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 →