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)10.0.109.128/25

network10.0.109.128/25

broadcast10.0.109.255

first host10.0.109.129

last host10.0.109.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.109.128/25

address00001010.00000000.01101101.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01101101.10000000

broadcast00001010.00000000.01101101.11111111

green = network part, grey = host part

hex0x0a006d80

decimal167800192

reverse dns128.109.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6d80

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.109.128/32	10.0.109.128 – 10.0.109.128	10.0.109.128
2	10.0.109.129/32	10.0.109.129 – 10.0.109.129	10.0.109.129
3	10.0.109.130/32	10.0.109.130 – 10.0.109.130	10.0.109.130
4	10.0.109.131/32	10.0.109.131 – 10.0.109.131	10.0.109.131
5	10.0.109.132/32	10.0.109.132 – 10.0.109.132	10.0.109.132
6	10.0.109.133/32	10.0.109.133 – 10.0.109.133	10.0.109.133
7	10.0.109.134/32	10.0.109.134 – 10.0.109.134	10.0.109.134
8	10.0.109.135/32	10.0.109.135 – 10.0.109.135	10.0.109.135
9	10.0.109.136/32	10.0.109.136 – 10.0.109.136	10.0.109.136
10	10.0.109.137/32	10.0.109.137 – 10.0.109.137	10.0.109.137
11	10.0.109.138/32	10.0.109.138 – 10.0.109.138	10.0.109.138
12	10.0.109.139/32	10.0.109.139 – 10.0.109.139	10.0.109.139
13	10.0.109.140/32	10.0.109.140 – 10.0.109.140	10.0.109.140
14	10.0.109.141/32	10.0.109.141 – 10.0.109.141	10.0.109.141
15	10.0.109.142/32	10.0.109.142 – 10.0.109.142	10.0.109.142
16	10.0.109.143/32	10.0.109.143 – 10.0.109.143	10.0.109.143
17	10.0.109.144/32	10.0.109.144 – 10.0.109.144	10.0.109.144
18	10.0.109.145/32	10.0.109.145 – 10.0.109.145	10.0.109.145
19	10.0.109.146/32	10.0.109.146 – 10.0.109.146	10.0.109.146
20	10.0.109.147/32	10.0.109.147 – 10.0.109.147	10.0.109.147
21	10.0.109.148/32	10.0.109.148 – 10.0.109.148	10.0.109.148
22	10.0.109.149/32	10.0.109.149 – 10.0.109.149	10.0.109.149
23	10.0.109.150/32	10.0.109.150 – 10.0.109.150	10.0.109.150
24	10.0.109.151/32	10.0.109.151 – 10.0.109.151	10.0.109.151
25	10.0.109.152/32	10.0.109.152 – 10.0.109.152	10.0.109.152
26	10.0.109.153/32	10.0.109.153 – 10.0.109.153	10.0.109.153
27	10.0.109.154/32	10.0.109.154 – 10.0.109.154	10.0.109.154
28	10.0.109.155/32	10.0.109.155 – 10.0.109.155	10.0.109.155
29	10.0.109.156/32	10.0.109.156 – 10.0.109.156	10.0.109.156
30	10.0.109.157/32	10.0.109.157 – 10.0.109.157	10.0.109.157
31	10.0.109.158/32	10.0.109.158 – 10.0.109.158	10.0.109.158
32	10.0.109.159/32	10.0.109.159 – 10.0.109.159	10.0.109.159
33	10.0.109.160/32	10.0.109.160 – 10.0.109.160	10.0.109.160
34	10.0.109.161/32	10.0.109.161 – 10.0.109.161	10.0.109.161
35	10.0.109.162/32	10.0.109.162 – 10.0.109.162	10.0.109.162
36	10.0.109.163/32	10.0.109.163 – 10.0.109.163	10.0.109.163
37	10.0.109.164/32	10.0.109.164 – 10.0.109.164	10.0.109.164
38	10.0.109.165/32	10.0.109.165 – 10.0.109.165	10.0.109.165
39	10.0.109.166/32	10.0.109.166 – 10.0.109.166	10.0.109.166
40	10.0.109.167/32	10.0.109.167 – 10.0.109.167	10.0.109.167
41	10.0.109.168/32	10.0.109.168 – 10.0.109.168	10.0.109.168
42	10.0.109.169/32	10.0.109.169 – 10.0.109.169	10.0.109.169
43	10.0.109.170/32	10.0.109.170 – 10.0.109.170	10.0.109.170
44	10.0.109.171/32	10.0.109.171 – 10.0.109.171	10.0.109.171
45	10.0.109.172/32	10.0.109.172 – 10.0.109.172	10.0.109.172
46	10.0.109.173/32	10.0.109.173 – 10.0.109.173	10.0.109.173
47	10.0.109.174/32	10.0.109.174 – 10.0.109.174	10.0.109.174
48	10.0.109.175/32	10.0.109.175 – 10.0.109.175	10.0.109.175
49	10.0.109.176/32	10.0.109.176 – 10.0.109.176	10.0.109.176
50	10.0.109.177/32	10.0.109.177 – 10.0.109.177	10.0.109.177
51	10.0.109.178/32	10.0.109.178 – 10.0.109.178	10.0.109.178
52	10.0.109.179/32	10.0.109.179 – 10.0.109.179	10.0.109.179
53	10.0.109.180/32	10.0.109.180 – 10.0.109.180	10.0.109.180
54	10.0.109.181/32	10.0.109.181 – 10.0.109.181	10.0.109.181
55	10.0.109.182/32	10.0.109.182 – 10.0.109.182	10.0.109.182
56	10.0.109.183/32	10.0.109.183 – 10.0.109.183	10.0.109.183
57	10.0.109.184/32	10.0.109.184 – 10.0.109.184	10.0.109.184
58	10.0.109.185/32	10.0.109.185 – 10.0.109.185	10.0.109.185
59	10.0.109.186/32	10.0.109.186 – 10.0.109.186	10.0.109.186
60	10.0.109.187/32	10.0.109.187 – 10.0.109.187	10.0.109.187
61	10.0.109.188/32	10.0.109.188 – 10.0.109.188	10.0.109.188
62	10.0.109.189/32	10.0.109.189 – 10.0.109.189	10.0.109.189
63	10.0.109.190/32	10.0.109.190 – 10.0.109.190	10.0.109.190
64	10.0.109.191/32	10.0.109.191 – 10.0.109.191	10.0.109.191
65	10.0.109.192/32	10.0.109.192 – 10.0.109.192	10.0.109.192
66	10.0.109.193/32	10.0.109.193 – 10.0.109.193	10.0.109.193
67	10.0.109.194/32	10.0.109.194 – 10.0.109.194	10.0.109.194
68	10.0.109.195/32	10.0.109.195 – 10.0.109.195	10.0.109.195
69	10.0.109.196/32	10.0.109.196 – 10.0.109.196	10.0.109.196
70	10.0.109.197/32	10.0.109.197 – 10.0.109.197	10.0.109.197
71	10.0.109.198/32	10.0.109.198 – 10.0.109.198	10.0.109.198
72	10.0.109.199/32	10.0.109.199 – 10.0.109.199	10.0.109.199
73	10.0.109.200/32	10.0.109.200 – 10.0.109.200	10.0.109.200
74	10.0.109.201/32	10.0.109.201 – 10.0.109.201	10.0.109.201
75	10.0.109.202/32	10.0.109.202 – 10.0.109.202	10.0.109.202
76	10.0.109.203/32	10.0.109.203 – 10.0.109.203	10.0.109.203
77	10.0.109.204/32	10.0.109.204 – 10.0.109.204	10.0.109.204
78	10.0.109.205/32	10.0.109.205 – 10.0.109.205	10.0.109.205
79	10.0.109.206/32	10.0.109.206 – 10.0.109.206	10.0.109.206
80	10.0.109.207/32	10.0.109.207 – 10.0.109.207	10.0.109.207
81	10.0.109.208/32	10.0.109.208 – 10.0.109.208	10.0.109.208
82	10.0.109.209/32	10.0.109.209 – 10.0.109.209	10.0.109.209
83	10.0.109.210/32	10.0.109.210 – 10.0.109.210	10.0.109.210
84	10.0.109.211/32	10.0.109.211 – 10.0.109.211	10.0.109.211
85	10.0.109.212/32	10.0.109.212 – 10.0.109.212	10.0.109.212
86	10.0.109.213/32	10.0.109.213 – 10.0.109.213	10.0.109.213
87	10.0.109.214/32	10.0.109.214 – 10.0.109.214	10.0.109.214
88	10.0.109.215/32	10.0.109.215 – 10.0.109.215	10.0.109.215
89	10.0.109.216/32	10.0.109.216 – 10.0.109.216	10.0.109.216
90	10.0.109.217/32	10.0.109.217 – 10.0.109.217	10.0.109.217
91	10.0.109.218/32	10.0.109.218 – 10.0.109.218	10.0.109.218
92	10.0.109.219/32	10.0.109.219 – 10.0.109.219	10.0.109.219
93	10.0.109.220/32	10.0.109.220 – 10.0.109.220	10.0.109.220
94	10.0.109.221/32	10.0.109.221 – 10.0.109.221	10.0.109.221
95	10.0.109.222/32	10.0.109.222 – 10.0.109.222	10.0.109.222
96	10.0.109.223/32	10.0.109.223 – 10.0.109.223	10.0.109.223
97	10.0.109.224/32	10.0.109.224 – 10.0.109.224	10.0.109.224
98	10.0.109.225/32	10.0.109.225 – 10.0.109.225	10.0.109.225
99	10.0.109.226/32	10.0.109.226 – 10.0.109.226	10.0.109.226
100	10.0.109.227/32	10.0.109.227 – 10.0.109.227	10.0.109.227
101	10.0.109.228/32	10.0.109.228 – 10.0.109.228	10.0.109.228
102	10.0.109.229/32	10.0.109.229 – 10.0.109.229	10.0.109.229
103	10.0.109.230/32	10.0.109.230 – 10.0.109.230	10.0.109.230
104	10.0.109.231/32	10.0.109.231 – 10.0.109.231	10.0.109.231
105	10.0.109.232/32	10.0.109.232 – 10.0.109.232	10.0.109.232
106	10.0.109.233/32	10.0.109.233 – 10.0.109.233	10.0.109.233
107	10.0.109.234/32	10.0.109.234 – 10.0.109.234	10.0.109.234
108	10.0.109.235/32	10.0.109.235 – 10.0.109.235	10.0.109.235
109	10.0.109.236/32	10.0.109.236 – 10.0.109.236	10.0.109.236
110	10.0.109.237/32	10.0.109.237 – 10.0.109.237	10.0.109.237
111	10.0.109.238/32	10.0.109.238 – 10.0.109.238	10.0.109.238
112	10.0.109.239/32	10.0.109.239 – 10.0.109.239	10.0.109.239
113	10.0.109.240/32	10.0.109.240 – 10.0.109.240	10.0.109.240
114	10.0.109.241/32	10.0.109.241 – 10.0.109.241	10.0.109.241
115	10.0.109.242/32	10.0.109.242 – 10.0.109.242	10.0.109.242
116	10.0.109.243/32	10.0.109.243 – 10.0.109.243	10.0.109.243
117	10.0.109.244/32	10.0.109.244 – 10.0.109.244	10.0.109.244
118	10.0.109.245/32	10.0.109.245 – 10.0.109.245	10.0.109.245
119	10.0.109.246/32	10.0.109.246 – 10.0.109.246	10.0.109.246
120	10.0.109.247/32	10.0.109.247 – 10.0.109.247	10.0.109.247
121	10.0.109.248/32	10.0.109.248 – 10.0.109.248	10.0.109.248
122	10.0.109.249/32	10.0.109.249 – 10.0.109.249	10.0.109.249
123	10.0.109.250/32	10.0.109.250 – 10.0.109.250	10.0.109.250
124	10.0.109.251/32	10.0.109.251 – 10.0.109.251	10.0.109.251
125	10.0.109.252/32	10.0.109.252 – 10.0.109.252	10.0.109.252
126	10.0.109.253/32	10.0.109.253 – 10.0.109.253	10.0.109.253
127	10.0.109.254/32	10.0.109.254 – 10.0.109.254	10.0.109.254
128	10.0.109.255/32	10.0.109.255 – 10.0.109.255	10.0.109.255

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 →