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)10.2.136.128/25

network10.2.136.128/25

broadcast10.2.136.255

first host10.2.136.129

last host10.2.136.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.136.128/25

address00001010.00000010.10001000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10001000.10000000

broadcast00001010.00000010.10001000.11111111

green = network part, grey = host part

hex0x0a028880

decimal167938176

reverse dns128.136.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8880

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.136.128/32	10.2.136.128 – 10.2.136.128	10.2.136.128
2	10.2.136.129/32	10.2.136.129 – 10.2.136.129	10.2.136.129
3	10.2.136.130/32	10.2.136.130 – 10.2.136.130	10.2.136.130
4	10.2.136.131/32	10.2.136.131 – 10.2.136.131	10.2.136.131
5	10.2.136.132/32	10.2.136.132 – 10.2.136.132	10.2.136.132
6	10.2.136.133/32	10.2.136.133 – 10.2.136.133	10.2.136.133
7	10.2.136.134/32	10.2.136.134 – 10.2.136.134	10.2.136.134
8	10.2.136.135/32	10.2.136.135 – 10.2.136.135	10.2.136.135
9	10.2.136.136/32	10.2.136.136 – 10.2.136.136	10.2.136.136
10	10.2.136.137/32	10.2.136.137 – 10.2.136.137	10.2.136.137
11	10.2.136.138/32	10.2.136.138 – 10.2.136.138	10.2.136.138
12	10.2.136.139/32	10.2.136.139 – 10.2.136.139	10.2.136.139
13	10.2.136.140/32	10.2.136.140 – 10.2.136.140	10.2.136.140
14	10.2.136.141/32	10.2.136.141 – 10.2.136.141	10.2.136.141
15	10.2.136.142/32	10.2.136.142 – 10.2.136.142	10.2.136.142
16	10.2.136.143/32	10.2.136.143 – 10.2.136.143	10.2.136.143
17	10.2.136.144/32	10.2.136.144 – 10.2.136.144	10.2.136.144
18	10.2.136.145/32	10.2.136.145 – 10.2.136.145	10.2.136.145
19	10.2.136.146/32	10.2.136.146 – 10.2.136.146	10.2.136.146
20	10.2.136.147/32	10.2.136.147 – 10.2.136.147	10.2.136.147
21	10.2.136.148/32	10.2.136.148 – 10.2.136.148	10.2.136.148
22	10.2.136.149/32	10.2.136.149 – 10.2.136.149	10.2.136.149
23	10.2.136.150/32	10.2.136.150 – 10.2.136.150	10.2.136.150
24	10.2.136.151/32	10.2.136.151 – 10.2.136.151	10.2.136.151
25	10.2.136.152/32	10.2.136.152 – 10.2.136.152	10.2.136.152
26	10.2.136.153/32	10.2.136.153 – 10.2.136.153	10.2.136.153
27	10.2.136.154/32	10.2.136.154 – 10.2.136.154	10.2.136.154
28	10.2.136.155/32	10.2.136.155 – 10.2.136.155	10.2.136.155
29	10.2.136.156/32	10.2.136.156 – 10.2.136.156	10.2.136.156
30	10.2.136.157/32	10.2.136.157 – 10.2.136.157	10.2.136.157
31	10.2.136.158/32	10.2.136.158 – 10.2.136.158	10.2.136.158
32	10.2.136.159/32	10.2.136.159 – 10.2.136.159	10.2.136.159
33	10.2.136.160/32	10.2.136.160 – 10.2.136.160	10.2.136.160
34	10.2.136.161/32	10.2.136.161 – 10.2.136.161	10.2.136.161
35	10.2.136.162/32	10.2.136.162 – 10.2.136.162	10.2.136.162
36	10.2.136.163/32	10.2.136.163 – 10.2.136.163	10.2.136.163
37	10.2.136.164/32	10.2.136.164 – 10.2.136.164	10.2.136.164
38	10.2.136.165/32	10.2.136.165 – 10.2.136.165	10.2.136.165
39	10.2.136.166/32	10.2.136.166 – 10.2.136.166	10.2.136.166
40	10.2.136.167/32	10.2.136.167 – 10.2.136.167	10.2.136.167
41	10.2.136.168/32	10.2.136.168 – 10.2.136.168	10.2.136.168
42	10.2.136.169/32	10.2.136.169 – 10.2.136.169	10.2.136.169
43	10.2.136.170/32	10.2.136.170 – 10.2.136.170	10.2.136.170
44	10.2.136.171/32	10.2.136.171 – 10.2.136.171	10.2.136.171
45	10.2.136.172/32	10.2.136.172 – 10.2.136.172	10.2.136.172
46	10.2.136.173/32	10.2.136.173 – 10.2.136.173	10.2.136.173
47	10.2.136.174/32	10.2.136.174 – 10.2.136.174	10.2.136.174
48	10.2.136.175/32	10.2.136.175 – 10.2.136.175	10.2.136.175
49	10.2.136.176/32	10.2.136.176 – 10.2.136.176	10.2.136.176
50	10.2.136.177/32	10.2.136.177 – 10.2.136.177	10.2.136.177
51	10.2.136.178/32	10.2.136.178 – 10.2.136.178	10.2.136.178
52	10.2.136.179/32	10.2.136.179 – 10.2.136.179	10.2.136.179
53	10.2.136.180/32	10.2.136.180 – 10.2.136.180	10.2.136.180
54	10.2.136.181/32	10.2.136.181 – 10.2.136.181	10.2.136.181
55	10.2.136.182/32	10.2.136.182 – 10.2.136.182	10.2.136.182
56	10.2.136.183/32	10.2.136.183 – 10.2.136.183	10.2.136.183
57	10.2.136.184/32	10.2.136.184 – 10.2.136.184	10.2.136.184
58	10.2.136.185/32	10.2.136.185 – 10.2.136.185	10.2.136.185
59	10.2.136.186/32	10.2.136.186 – 10.2.136.186	10.2.136.186
60	10.2.136.187/32	10.2.136.187 – 10.2.136.187	10.2.136.187
61	10.2.136.188/32	10.2.136.188 – 10.2.136.188	10.2.136.188
62	10.2.136.189/32	10.2.136.189 – 10.2.136.189	10.2.136.189
63	10.2.136.190/32	10.2.136.190 – 10.2.136.190	10.2.136.190
64	10.2.136.191/32	10.2.136.191 – 10.2.136.191	10.2.136.191
65	10.2.136.192/32	10.2.136.192 – 10.2.136.192	10.2.136.192
66	10.2.136.193/32	10.2.136.193 – 10.2.136.193	10.2.136.193
67	10.2.136.194/32	10.2.136.194 – 10.2.136.194	10.2.136.194
68	10.2.136.195/32	10.2.136.195 – 10.2.136.195	10.2.136.195
69	10.2.136.196/32	10.2.136.196 – 10.2.136.196	10.2.136.196
70	10.2.136.197/32	10.2.136.197 – 10.2.136.197	10.2.136.197
71	10.2.136.198/32	10.2.136.198 – 10.2.136.198	10.2.136.198
72	10.2.136.199/32	10.2.136.199 – 10.2.136.199	10.2.136.199
73	10.2.136.200/32	10.2.136.200 – 10.2.136.200	10.2.136.200
74	10.2.136.201/32	10.2.136.201 – 10.2.136.201	10.2.136.201
75	10.2.136.202/32	10.2.136.202 – 10.2.136.202	10.2.136.202
76	10.2.136.203/32	10.2.136.203 – 10.2.136.203	10.2.136.203
77	10.2.136.204/32	10.2.136.204 – 10.2.136.204	10.2.136.204
78	10.2.136.205/32	10.2.136.205 – 10.2.136.205	10.2.136.205
79	10.2.136.206/32	10.2.136.206 – 10.2.136.206	10.2.136.206
80	10.2.136.207/32	10.2.136.207 – 10.2.136.207	10.2.136.207
81	10.2.136.208/32	10.2.136.208 – 10.2.136.208	10.2.136.208
82	10.2.136.209/32	10.2.136.209 – 10.2.136.209	10.2.136.209
83	10.2.136.210/32	10.2.136.210 – 10.2.136.210	10.2.136.210
84	10.2.136.211/32	10.2.136.211 – 10.2.136.211	10.2.136.211
85	10.2.136.212/32	10.2.136.212 – 10.2.136.212	10.2.136.212
86	10.2.136.213/32	10.2.136.213 – 10.2.136.213	10.2.136.213
87	10.2.136.214/32	10.2.136.214 – 10.2.136.214	10.2.136.214
88	10.2.136.215/32	10.2.136.215 – 10.2.136.215	10.2.136.215
89	10.2.136.216/32	10.2.136.216 – 10.2.136.216	10.2.136.216
90	10.2.136.217/32	10.2.136.217 – 10.2.136.217	10.2.136.217
91	10.2.136.218/32	10.2.136.218 – 10.2.136.218	10.2.136.218
92	10.2.136.219/32	10.2.136.219 – 10.2.136.219	10.2.136.219
93	10.2.136.220/32	10.2.136.220 – 10.2.136.220	10.2.136.220
94	10.2.136.221/32	10.2.136.221 – 10.2.136.221	10.2.136.221
95	10.2.136.222/32	10.2.136.222 – 10.2.136.222	10.2.136.222
96	10.2.136.223/32	10.2.136.223 – 10.2.136.223	10.2.136.223
97	10.2.136.224/32	10.2.136.224 – 10.2.136.224	10.2.136.224
98	10.2.136.225/32	10.2.136.225 – 10.2.136.225	10.2.136.225
99	10.2.136.226/32	10.2.136.226 – 10.2.136.226	10.2.136.226
100	10.2.136.227/32	10.2.136.227 – 10.2.136.227	10.2.136.227
101	10.2.136.228/32	10.2.136.228 – 10.2.136.228	10.2.136.228
102	10.2.136.229/32	10.2.136.229 – 10.2.136.229	10.2.136.229
103	10.2.136.230/32	10.2.136.230 – 10.2.136.230	10.2.136.230
104	10.2.136.231/32	10.2.136.231 – 10.2.136.231	10.2.136.231
105	10.2.136.232/32	10.2.136.232 – 10.2.136.232	10.2.136.232
106	10.2.136.233/32	10.2.136.233 – 10.2.136.233	10.2.136.233
107	10.2.136.234/32	10.2.136.234 – 10.2.136.234	10.2.136.234
108	10.2.136.235/32	10.2.136.235 – 10.2.136.235	10.2.136.235
109	10.2.136.236/32	10.2.136.236 – 10.2.136.236	10.2.136.236
110	10.2.136.237/32	10.2.136.237 – 10.2.136.237	10.2.136.237
111	10.2.136.238/32	10.2.136.238 – 10.2.136.238	10.2.136.238
112	10.2.136.239/32	10.2.136.239 – 10.2.136.239	10.2.136.239
113	10.2.136.240/32	10.2.136.240 – 10.2.136.240	10.2.136.240
114	10.2.136.241/32	10.2.136.241 – 10.2.136.241	10.2.136.241
115	10.2.136.242/32	10.2.136.242 – 10.2.136.242	10.2.136.242
116	10.2.136.243/32	10.2.136.243 – 10.2.136.243	10.2.136.243
117	10.2.136.244/32	10.2.136.244 – 10.2.136.244	10.2.136.244
118	10.2.136.245/32	10.2.136.245 – 10.2.136.245	10.2.136.245
119	10.2.136.246/32	10.2.136.246 – 10.2.136.246	10.2.136.246
120	10.2.136.247/32	10.2.136.247 – 10.2.136.247	10.2.136.247
121	10.2.136.248/32	10.2.136.248 – 10.2.136.248	10.2.136.248
122	10.2.136.249/32	10.2.136.249 – 10.2.136.249	10.2.136.249
123	10.2.136.250/32	10.2.136.250 – 10.2.136.250	10.2.136.250
124	10.2.136.251/32	10.2.136.251 – 10.2.136.251	10.2.136.251
125	10.2.136.252/32	10.2.136.252 – 10.2.136.252	10.2.136.252
126	10.2.136.253/32	10.2.136.253 – 10.2.136.253	10.2.136.253
127	10.2.136.254/32	10.2.136.254 – 10.2.136.254	10.2.136.254
128	10.2.136.255/32	10.2.136.255 – 10.2.136.255	10.2.136.255

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 →