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)10.0.38.128/25

network10.0.38.128/25

broadcast10.0.38.255

first host10.0.38.129

last host10.0.38.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.38.128/25

address00001010.00000000.00100110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.00100110.10000000

broadcast00001010.00000000.00100110.11111111

green = network part, grey = host part

hex0x0a002680

decimal167782016

reverse dns128.38.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:2680

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.38.128/32	10.0.38.128 – 10.0.38.128	10.0.38.128
2	10.0.38.129/32	10.0.38.129 – 10.0.38.129	10.0.38.129
3	10.0.38.130/32	10.0.38.130 – 10.0.38.130	10.0.38.130
4	10.0.38.131/32	10.0.38.131 – 10.0.38.131	10.0.38.131
5	10.0.38.132/32	10.0.38.132 – 10.0.38.132	10.0.38.132
6	10.0.38.133/32	10.0.38.133 – 10.0.38.133	10.0.38.133
7	10.0.38.134/32	10.0.38.134 – 10.0.38.134	10.0.38.134
8	10.0.38.135/32	10.0.38.135 – 10.0.38.135	10.0.38.135
9	10.0.38.136/32	10.0.38.136 – 10.0.38.136	10.0.38.136
10	10.0.38.137/32	10.0.38.137 – 10.0.38.137	10.0.38.137
11	10.0.38.138/32	10.0.38.138 – 10.0.38.138	10.0.38.138
12	10.0.38.139/32	10.0.38.139 – 10.0.38.139	10.0.38.139
13	10.0.38.140/32	10.0.38.140 – 10.0.38.140	10.0.38.140
14	10.0.38.141/32	10.0.38.141 – 10.0.38.141	10.0.38.141
15	10.0.38.142/32	10.0.38.142 – 10.0.38.142	10.0.38.142
16	10.0.38.143/32	10.0.38.143 – 10.0.38.143	10.0.38.143
17	10.0.38.144/32	10.0.38.144 – 10.0.38.144	10.0.38.144
18	10.0.38.145/32	10.0.38.145 – 10.0.38.145	10.0.38.145
19	10.0.38.146/32	10.0.38.146 – 10.0.38.146	10.0.38.146
20	10.0.38.147/32	10.0.38.147 – 10.0.38.147	10.0.38.147
21	10.0.38.148/32	10.0.38.148 – 10.0.38.148	10.0.38.148
22	10.0.38.149/32	10.0.38.149 – 10.0.38.149	10.0.38.149
23	10.0.38.150/32	10.0.38.150 – 10.0.38.150	10.0.38.150
24	10.0.38.151/32	10.0.38.151 – 10.0.38.151	10.0.38.151
25	10.0.38.152/32	10.0.38.152 – 10.0.38.152	10.0.38.152
26	10.0.38.153/32	10.0.38.153 – 10.0.38.153	10.0.38.153
27	10.0.38.154/32	10.0.38.154 – 10.0.38.154	10.0.38.154
28	10.0.38.155/32	10.0.38.155 – 10.0.38.155	10.0.38.155
29	10.0.38.156/32	10.0.38.156 – 10.0.38.156	10.0.38.156
30	10.0.38.157/32	10.0.38.157 – 10.0.38.157	10.0.38.157
31	10.0.38.158/32	10.0.38.158 – 10.0.38.158	10.0.38.158
32	10.0.38.159/32	10.0.38.159 – 10.0.38.159	10.0.38.159
33	10.0.38.160/32	10.0.38.160 – 10.0.38.160	10.0.38.160
34	10.0.38.161/32	10.0.38.161 – 10.0.38.161	10.0.38.161
35	10.0.38.162/32	10.0.38.162 – 10.0.38.162	10.0.38.162
36	10.0.38.163/32	10.0.38.163 – 10.0.38.163	10.0.38.163
37	10.0.38.164/32	10.0.38.164 – 10.0.38.164	10.0.38.164
38	10.0.38.165/32	10.0.38.165 – 10.0.38.165	10.0.38.165
39	10.0.38.166/32	10.0.38.166 – 10.0.38.166	10.0.38.166
40	10.0.38.167/32	10.0.38.167 – 10.0.38.167	10.0.38.167
41	10.0.38.168/32	10.0.38.168 – 10.0.38.168	10.0.38.168
42	10.0.38.169/32	10.0.38.169 – 10.0.38.169	10.0.38.169
43	10.0.38.170/32	10.0.38.170 – 10.0.38.170	10.0.38.170
44	10.0.38.171/32	10.0.38.171 – 10.0.38.171	10.0.38.171
45	10.0.38.172/32	10.0.38.172 – 10.0.38.172	10.0.38.172
46	10.0.38.173/32	10.0.38.173 – 10.0.38.173	10.0.38.173
47	10.0.38.174/32	10.0.38.174 – 10.0.38.174	10.0.38.174
48	10.0.38.175/32	10.0.38.175 – 10.0.38.175	10.0.38.175
49	10.0.38.176/32	10.0.38.176 – 10.0.38.176	10.0.38.176
50	10.0.38.177/32	10.0.38.177 – 10.0.38.177	10.0.38.177
51	10.0.38.178/32	10.0.38.178 – 10.0.38.178	10.0.38.178
52	10.0.38.179/32	10.0.38.179 – 10.0.38.179	10.0.38.179
53	10.0.38.180/32	10.0.38.180 – 10.0.38.180	10.0.38.180
54	10.0.38.181/32	10.0.38.181 – 10.0.38.181	10.0.38.181
55	10.0.38.182/32	10.0.38.182 – 10.0.38.182	10.0.38.182
56	10.0.38.183/32	10.0.38.183 – 10.0.38.183	10.0.38.183
57	10.0.38.184/32	10.0.38.184 – 10.0.38.184	10.0.38.184
58	10.0.38.185/32	10.0.38.185 – 10.0.38.185	10.0.38.185
59	10.0.38.186/32	10.0.38.186 – 10.0.38.186	10.0.38.186
60	10.0.38.187/32	10.0.38.187 – 10.0.38.187	10.0.38.187
61	10.0.38.188/32	10.0.38.188 – 10.0.38.188	10.0.38.188
62	10.0.38.189/32	10.0.38.189 – 10.0.38.189	10.0.38.189
63	10.0.38.190/32	10.0.38.190 – 10.0.38.190	10.0.38.190
64	10.0.38.191/32	10.0.38.191 – 10.0.38.191	10.0.38.191
65	10.0.38.192/32	10.0.38.192 – 10.0.38.192	10.0.38.192
66	10.0.38.193/32	10.0.38.193 – 10.0.38.193	10.0.38.193
67	10.0.38.194/32	10.0.38.194 – 10.0.38.194	10.0.38.194
68	10.0.38.195/32	10.0.38.195 – 10.0.38.195	10.0.38.195
69	10.0.38.196/32	10.0.38.196 – 10.0.38.196	10.0.38.196
70	10.0.38.197/32	10.0.38.197 – 10.0.38.197	10.0.38.197
71	10.0.38.198/32	10.0.38.198 – 10.0.38.198	10.0.38.198
72	10.0.38.199/32	10.0.38.199 – 10.0.38.199	10.0.38.199
73	10.0.38.200/32	10.0.38.200 – 10.0.38.200	10.0.38.200
74	10.0.38.201/32	10.0.38.201 – 10.0.38.201	10.0.38.201
75	10.0.38.202/32	10.0.38.202 – 10.0.38.202	10.0.38.202
76	10.0.38.203/32	10.0.38.203 – 10.0.38.203	10.0.38.203
77	10.0.38.204/32	10.0.38.204 – 10.0.38.204	10.0.38.204
78	10.0.38.205/32	10.0.38.205 – 10.0.38.205	10.0.38.205
79	10.0.38.206/32	10.0.38.206 – 10.0.38.206	10.0.38.206
80	10.0.38.207/32	10.0.38.207 – 10.0.38.207	10.0.38.207
81	10.0.38.208/32	10.0.38.208 – 10.0.38.208	10.0.38.208
82	10.0.38.209/32	10.0.38.209 – 10.0.38.209	10.0.38.209
83	10.0.38.210/32	10.0.38.210 – 10.0.38.210	10.0.38.210
84	10.0.38.211/32	10.0.38.211 – 10.0.38.211	10.0.38.211
85	10.0.38.212/32	10.0.38.212 – 10.0.38.212	10.0.38.212
86	10.0.38.213/32	10.0.38.213 – 10.0.38.213	10.0.38.213
87	10.0.38.214/32	10.0.38.214 – 10.0.38.214	10.0.38.214
88	10.0.38.215/32	10.0.38.215 – 10.0.38.215	10.0.38.215
89	10.0.38.216/32	10.0.38.216 – 10.0.38.216	10.0.38.216
90	10.0.38.217/32	10.0.38.217 – 10.0.38.217	10.0.38.217
91	10.0.38.218/32	10.0.38.218 – 10.0.38.218	10.0.38.218
92	10.0.38.219/32	10.0.38.219 – 10.0.38.219	10.0.38.219
93	10.0.38.220/32	10.0.38.220 – 10.0.38.220	10.0.38.220
94	10.0.38.221/32	10.0.38.221 – 10.0.38.221	10.0.38.221
95	10.0.38.222/32	10.0.38.222 – 10.0.38.222	10.0.38.222
96	10.0.38.223/32	10.0.38.223 – 10.0.38.223	10.0.38.223
97	10.0.38.224/32	10.0.38.224 – 10.0.38.224	10.0.38.224
98	10.0.38.225/32	10.0.38.225 – 10.0.38.225	10.0.38.225
99	10.0.38.226/32	10.0.38.226 – 10.0.38.226	10.0.38.226
100	10.0.38.227/32	10.0.38.227 – 10.0.38.227	10.0.38.227
101	10.0.38.228/32	10.0.38.228 – 10.0.38.228	10.0.38.228
102	10.0.38.229/32	10.0.38.229 – 10.0.38.229	10.0.38.229
103	10.0.38.230/32	10.0.38.230 – 10.0.38.230	10.0.38.230
104	10.0.38.231/32	10.0.38.231 – 10.0.38.231	10.0.38.231
105	10.0.38.232/32	10.0.38.232 – 10.0.38.232	10.0.38.232
106	10.0.38.233/32	10.0.38.233 – 10.0.38.233	10.0.38.233
107	10.0.38.234/32	10.0.38.234 – 10.0.38.234	10.0.38.234
108	10.0.38.235/32	10.0.38.235 – 10.0.38.235	10.0.38.235
109	10.0.38.236/32	10.0.38.236 – 10.0.38.236	10.0.38.236
110	10.0.38.237/32	10.0.38.237 – 10.0.38.237	10.0.38.237
111	10.0.38.238/32	10.0.38.238 – 10.0.38.238	10.0.38.238
112	10.0.38.239/32	10.0.38.239 – 10.0.38.239	10.0.38.239
113	10.0.38.240/32	10.0.38.240 – 10.0.38.240	10.0.38.240
114	10.0.38.241/32	10.0.38.241 – 10.0.38.241	10.0.38.241
115	10.0.38.242/32	10.0.38.242 – 10.0.38.242	10.0.38.242
116	10.0.38.243/32	10.0.38.243 – 10.0.38.243	10.0.38.243
117	10.0.38.244/32	10.0.38.244 – 10.0.38.244	10.0.38.244
118	10.0.38.245/32	10.0.38.245 – 10.0.38.245	10.0.38.245
119	10.0.38.246/32	10.0.38.246 – 10.0.38.246	10.0.38.246
120	10.0.38.247/32	10.0.38.247 – 10.0.38.247	10.0.38.247
121	10.0.38.248/32	10.0.38.248 – 10.0.38.248	10.0.38.248
122	10.0.38.249/32	10.0.38.249 – 10.0.38.249	10.0.38.249
123	10.0.38.250/32	10.0.38.250 – 10.0.38.250	10.0.38.250
124	10.0.38.251/32	10.0.38.251 – 10.0.38.251	10.0.38.251
125	10.0.38.252/32	10.0.38.252 – 10.0.38.252	10.0.38.252
126	10.0.38.253/32	10.0.38.253 – 10.0.38.253	10.0.38.253
127	10.0.38.254/32	10.0.38.254 – 10.0.38.254	10.0.38.254
128	10.0.38.255/32	10.0.38.255 – 10.0.38.255	10.0.38.255

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 →