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)10.2.48.128/25

network10.2.48.128/25

broadcast10.2.48.255

first host10.2.48.129

last host10.2.48.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.48.128/25

address00001010.00000010.00110000.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00110000.10000000

broadcast00001010.00000010.00110000.11111111

green = network part, grey = host part

hex0x0a023080

decimal167915648

reverse dns128.48.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3080

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.48.128/32	10.2.48.128 – 10.2.48.128	10.2.48.128
2	10.2.48.129/32	10.2.48.129 – 10.2.48.129	10.2.48.129
3	10.2.48.130/32	10.2.48.130 – 10.2.48.130	10.2.48.130
4	10.2.48.131/32	10.2.48.131 – 10.2.48.131	10.2.48.131
5	10.2.48.132/32	10.2.48.132 – 10.2.48.132	10.2.48.132
6	10.2.48.133/32	10.2.48.133 – 10.2.48.133	10.2.48.133
7	10.2.48.134/32	10.2.48.134 – 10.2.48.134	10.2.48.134
8	10.2.48.135/32	10.2.48.135 – 10.2.48.135	10.2.48.135
9	10.2.48.136/32	10.2.48.136 – 10.2.48.136	10.2.48.136
10	10.2.48.137/32	10.2.48.137 – 10.2.48.137	10.2.48.137
11	10.2.48.138/32	10.2.48.138 – 10.2.48.138	10.2.48.138
12	10.2.48.139/32	10.2.48.139 – 10.2.48.139	10.2.48.139
13	10.2.48.140/32	10.2.48.140 – 10.2.48.140	10.2.48.140
14	10.2.48.141/32	10.2.48.141 – 10.2.48.141	10.2.48.141
15	10.2.48.142/32	10.2.48.142 – 10.2.48.142	10.2.48.142
16	10.2.48.143/32	10.2.48.143 – 10.2.48.143	10.2.48.143
17	10.2.48.144/32	10.2.48.144 – 10.2.48.144	10.2.48.144
18	10.2.48.145/32	10.2.48.145 – 10.2.48.145	10.2.48.145
19	10.2.48.146/32	10.2.48.146 – 10.2.48.146	10.2.48.146
20	10.2.48.147/32	10.2.48.147 – 10.2.48.147	10.2.48.147
21	10.2.48.148/32	10.2.48.148 – 10.2.48.148	10.2.48.148
22	10.2.48.149/32	10.2.48.149 – 10.2.48.149	10.2.48.149
23	10.2.48.150/32	10.2.48.150 – 10.2.48.150	10.2.48.150
24	10.2.48.151/32	10.2.48.151 – 10.2.48.151	10.2.48.151
25	10.2.48.152/32	10.2.48.152 – 10.2.48.152	10.2.48.152
26	10.2.48.153/32	10.2.48.153 – 10.2.48.153	10.2.48.153
27	10.2.48.154/32	10.2.48.154 – 10.2.48.154	10.2.48.154
28	10.2.48.155/32	10.2.48.155 – 10.2.48.155	10.2.48.155
29	10.2.48.156/32	10.2.48.156 – 10.2.48.156	10.2.48.156
30	10.2.48.157/32	10.2.48.157 – 10.2.48.157	10.2.48.157
31	10.2.48.158/32	10.2.48.158 – 10.2.48.158	10.2.48.158
32	10.2.48.159/32	10.2.48.159 – 10.2.48.159	10.2.48.159
33	10.2.48.160/32	10.2.48.160 – 10.2.48.160	10.2.48.160
34	10.2.48.161/32	10.2.48.161 – 10.2.48.161	10.2.48.161
35	10.2.48.162/32	10.2.48.162 – 10.2.48.162	10.2.48.162
36	10.2.48.163/32	10.2.48.163 – 10.2.48.163	10.2.48.163
37	10.2.48.164/32	10.2.48.164 – 10.2.48.164	10.2.48.164
38	10.2.48.165/32	10.2.48.165 – 10.2.48.165	10.2.48.165
39	10.2.48.166/32	10.2.48.166 – 10.2.48.166	10.2.48.166
40	10.2.48.167/32	10.2.48.167 – 10.2.48.167	10.2.48.167
41	10.2.48.168/32	10.2.48.168 – 10.2.48.168	10.2.48.168
42	10.2.48.169/32	10.2.48.169 – 10.2.48.169	10.2.48.169
43	10.2.48.170/32	10.2.48.170 – 10.2.48.170	10.2.48.170
44	10.2.48.171/32	10.2.48.171 – 10.2.48.171	10.2.48.171
45	10.2.48.172/32	10.2.48.172 – 10.2.48.172	10.2.48.172
46	10.2.48.173/32	10.2.48.173 – 10.2.48.173	10.2.48.173
47	10.2.48.174/32	10.2.48.174 – 10.2.48.174	10.2.48.174
48	10.2.48.175/32	10.2.48.175 – 10.2.48.175	10.2.48.175
49	10.2.48.176/32	10.2.48.176 – 10.2.48.176	10.2.48.176
50	10.2.48.177/32	10.2.48.177 – 10.2.48.177	10.2.48.177
51	10.2.48.178/32	10.2.48.178 – 10.2.48.178	10.2.48.178
52	10.2.48.179/32	10.2.48.179 – 10.2.48.179	10.2.48.179
53	10.2.48.180/32	10.2.48.180 – 10.2.48.180	10.2.48.180
54	10.2.48.181/32	10.2.48.181 – 10.2.48.181	10.2.48.181
55	10.2.48.182/32	10.2.48.182 – 10.2.48.182	10.2.48.182
56	10.2.48.183/32	10.2.48.183 – 10.2.48.183	10.2.48.183
57	10.2.48.184/32	10.2.48.184 – 10.2.48.184	10.2.48.184
58	10.2.48.185/32	10.2.48.185 – 10.2.48.185	10.2.48.185
59	10.2.48.186/32	10.2.48.186 – 10.2.48.186	10.2.48.186
60	10.2.48.187/32	10.2.48.187 – 10.2.48.187	10.2.48.187
61	10.2.48.188/32	10.2.48.188 – 10.2.48.188	10.2.48.188
62	10.2.48.189/32	10.2.48.189 – 10.2.48.189	10.2.48.189
63	10.2.48.190/32	10.2.48.190 – 10.2.48.190	10.2.48.190
64	10.2.48.191/32	10.2.48.191 – 10.2.48.191	10.2.48.191
65	10.2.48.192/32	10.2.48.192 – 10.2.48.192	10.2.48.192
66	10.2.48.193/32	10.2.48.193 – 10.2.48.193	10.2.48.193
67	10.2.48.194/32	10.2.48.194 – 10.2.48.194	10.2.48.194
68	10.2.48.195/32	10.2.48.195 – 10.2.48.195	10.2.48.195
69	10.2.48.196/32	10.2.48.196 – 10.2.48.196	10.2.48.196
70	10.2.48.197/32	10.2.48.197 – 10.2.48.197	10.2.48.197
71	10.2.48.198/32	10.2.48.198 – 10.2.48.198	10.2.48.198
72	10.2.48.199/32	10.2.48.199 – 10.2.48.199	10.2.48.199
73	10.2.48.200/32	10.2.48.200 – 10.2.48.200	10.2.48.200
74	10.2.48.201/32	10.2.48.201 – 10.2.48.201	10.2.48.201
75	10.2.48.202/32	10.2.48.202 – 10.2.48.202	10.2.48.202
76	10.2.48.203/32	10.2.48.203 – 10.2.48.203	10.2.48.203
77	10.2.48.204/32	10.2.48.204 – 10.2.48.204	10.2.48.204
78	10.2.48.205/32	10.2.48.205 – 10.2.48.205	10.2.48.205
79	10.2.48.206/32	10.2.48.206 – 10.2.48.206	10.2.48.206
80	10.2.48.207/32	10.2.48.207 – 10.2.48.207	10.2.48.207
81	10.2.48.208/32	10.2.48.208 – 10.2.48.208	10.2.48.208
82	10.2.48.209/32	10.2.48.209 – 10.2.48.209	10.2.48.209
83	10.2.48.210/32	10.2.48.210 – 10.2.48.210	10.2.48.210
84	10.2.48.211/32	10.2.48.211 – 10.2.48.211	10.2.48.211
85	10.2.48.212/32	10.2.48.212 – 10.2.48.212	10.2.48.212
86	10.2.48.213/32	10.2.48.213 – 10.2.48.213	10.2.48.213
87	10.2.48.214/32	10.2.48.214 – 10.2.48.214	10.2.48.214
88	10.2.48.215/32	10.2.48.215 – 10.2.48.215	10.2.48.215
89	10.2.48.216/32	10.2.48.216 – 10.2.48.216	10.2.48.216
90	10.2.48.217/32	10.2.48.217 – 10.2.48.217	10.2.48.217
91	10.2.48.218/32	10.2.48.218 – 10.2.48.218	10.2.48.218
92	10.2.48.219/32	10.2.48.219 – 10.2.48.219	10.2.48.219
93	10.2.48.220/32	10.2.48.220 – 10.2.48.220	10.2.48.220
94	10.2.48.221/32	10.2.48.221 – 10.2.48.221	10.2.48.221
95	10.2.48.222/32	10.2.48.222 – 10.2.48.222	10.2.48.222
96	10.2.48.223/32	10.2.48.223 – 10.2.48.223	10.2.48.223
97	10.2.48.224/32	10.2.48.224 – 10.2.48.224	10.2.48.224
98	10.2.48.225/32	10.2.48.225 – 10.2.48.225	10.2.48.225
99	10.2.48.226/32	10.2.48.226 – 10.2.48.226	10.2.48.226
100	10.2.48.227/32	10.2.48.227 – 10.2.48.227	10.2.48.227
101	10.2.48.228/32	10.2.48.228 – 10.2.48.228	10.2.48.228
102	10.2.48.229/32	10.2.48.229 – 10.2.48.229	10.2.48.229
103	10.2.48.230/32	10.2.48.230 – 10.2.48.230	10.2.48.230
104	10.2.48.231/32	10.2.48.231 – 10.2.48.231	10.2.48.231
105	10.2.48.232/32	10.2.48.232 – 10.2.48.232	10.2.48.232
106	10.2.48.233/32	10.2.48.233 – 10.2.48.233	10.2.48.233
107	10.2.48.234/32	10.2.48.234 – 10.2.48.234	10.2.48.234
108	10.2.48.235/32	10.2.48.235 – 10.2.48.235	10.2.48.235
109	10.2.48.236/32	10.2.48.236 – 10.2.48.236	10.2.48.236
110	10.2.48.237/32	10.2.48.237 – 10.2.48.237	10.2.48.237
111	10.2.48.238/32	10.2.48.238 – 10.2.48.238	10.2.48.238
112	10.2.48.239/32	10.2.48.239 – 10.2.48.239	10.2.48.239
113	10.2.48.240/32	10.2.48.240 – 10.2.48.240	10.2.48.240
114	10.2.48.241/32	10.2.48.241 – 10.2.48.241	10.2.48.241
115	10.2.48.242/32	10.2.48.242 – 10.2.48.242	10.2.48.242
116	10.2.48.243/32	10.2.48.243 – 10.2.48.243	10.2.48.243
117	10.2.48.244/32	10.2.48.244 – 10.2.48.244	10.2.48.244
118	10.2.48.245/32	10.2.48.245 – 10.2.48.245	10.2.48.245
119	10.2.48.246/32	10.2.48.246 – 10.2.48.246	10.2.48.246
120	10.2.48.247/32	10.2.48.247 – 10.2.48.247	10.2.48.247
121	10.2.48.248/32	10.2.48.248 – 10.2.48.248	10.2.48.248
122	10.2.48.249/32	10.2.48.249 – 10.2.48.249	10.2.48.249
123	10.2.48.250/32	10.2.48.250 – 10.2.48.250	10.2.48.250
124	10.2.48.251/32	10.2.48.251 – 10.2.48.251	10.2.48.251
125	10.2.48.252/32	10.2.48.252 – 10.2.48.252	10.2.48.252
126	10.2.48.253/32	10.2.48.253 – 10.2.48.253	10.2.48.253
127	10.2.48.254/32	10.2.48.254 – 10.2.48.254	10.2.48.254
128	10.2.48.255/32	10.2.48.255 – 10.2.48.255	10.2.48.255

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 →