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)10.2.49.128/25

network10.2.49.128/25

broadcast10.2.49.255

first host10.2.49.129

last host10.2.49.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.49.128/25

address00001010.00000010.00110001.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00110001.10000000

broadcast00001010.00000010.00110001.11111111

green = network part, grey = host part

hex0x0a023180

decimal167915904

reverse dns128.49.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3180

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.49.128/32	10.2.49.128 – 10.2.49.128	10.2.49.128
2	10.2.49.129/32	10.2.49.129 – 10.2.49.129	10.2.49.129
3	10.2.49.130/32	10.2.49.130 – 10.2.49.130	10.2.49.130
4	10.2.49.131/32	10.2.49.131 – 10.2.49.131	10.2.49.131
5	10.2.49.132/32	10.2.49.132 – 10.2.49.132	10.2.49.132
6	10.2.49.133/32	10.2.49.133 – 10.2.49.133	10.2.49.133
7	10.2.49.134/32	10.2.49.134 – 10.2.49.134	10.2.49.134
8	10.2.49.135/32	10.2.49.135 – 10.2.49.135	10.2.49.135
9	10.2.49.136/32	10.2.49.136 – 10.2.49.136	10.2.49.136
10	10.2.49.137/32	10.2.49.137 – 10.2.49.137	10.2.49.137
11	10.2.49.138/32	10.2.49.138 – 10.2.49.138	10.2.49.138
12	10.2.49.139/32	10.2.49.139 – 10.2.49.139	10.2.49.139
13	10.2.49.140/32	10.2.49.140 – 10.2.49.140	10.2.49.140
14	10.2.49.141/32	10.2.49.141 – 10.2.49.141	10.2.49.141
15	10.2.49.142/32	10.2.49.142 – 10.2.49.142	10.2.49.142
16	10.2.49.143/32	10.2.49.143 – 10.2.49.143	10.2.49.143
17	10.2.49.144/32	10.2.49.144 – 10.2.49.144	10.2.49.144
18	10.2.49.145/32	10.2.49.145 – 10.2.49.145	10.2.49.145
19	10.2.49.146/32	10.2.49.146 – 10.2.49.146	10.2.49.146
20	10.2.49.147/32	10.2.49.147 – 10.2.49.147	10.2.49.147
21	10.2.49.148/32	10.2.49.148 – 10.2.49.148	10.2.49.148
22	10.2.49.149/32	10.2.49.149 – 10.2.49.149	10.2.49.149
23	10.2.49.150/32	10.2.49.150 – 10.2.49.150	10.2.49.150
24	10.2.49.151/32	10.2.49.151 – 10.2.49.151	10.2.49.151
25	10.2.49.152/32	10.2.49.152 – 10.2.49.152	10.2.49.152
26	10.2.49.153/32	10.2.49.153 – 10.2.49.153	10.2.49.153
27	10.2.49.154/32	10.2.49.154 – 10.2.49.154	10.2.49.154
28	10.2.49.155/32	10.2.49.155 – 10.2.49.155	10.2.49.155
29	10.2.49.156/32	10.2.49.156 – 10.2.49.156	10.2.49.156
30	10.2.49.157/32	10.2.49.157 – 10.2.49.157	10.2.49.157
31	10.2.49.158/32	10.2.49.158 – 10.2.49.158	10.2.49.158
32	10.2.49.159/32	10.2.49.159 – 10.2.49.159	10.2.49.159
33	10.2.49.160/32	10.2.49.160 – 10.2.49.160	10.2.49.160
34	10.2.49.161/32	10.2.49.161 – 10.2.49.161	10.2.49.161
35	10.2.49.162/32	10.2.49.162 – 10.2.49.162	10.2.49.162
36	10.2.49.163/32	10.2.49.163 – 10.2.49.163	10.2.49.163
37	10.2.49.164/32	10.2.49.164 – 10.2.49.164	10.2.49.164
38	10.2.49.165/32	10.2.49.165 – 10.2.49.165	10.2.49.165
39	10.2.49.166/32	10.2.49.166 – 10.2.49.166	10.2.49.166
40	10.2.49.167/32	10.2.49.167 – 10.2.49.167	10.2.49.167
41	10.2.49.168/32	10.2.49.168 – 10.2.49.168	10.2.49.168
42	10.2.49.169/32	10.2.49.169 – 10.2.49.169	10.2.49.169
43	10.2.49.170/32	10.2.49.170 – 10.2.49.170	10.2.49.170
44	10.2.49.171/32	10.2.49.171 – 10.2.49.171	10.2.49.171
45	10.2.49.172/32	10.2.49.172 – 10.2.49.172	10.2.49.172
46	10.2.49.173/32	10.2.49.173 – 10.2.49.173	10.2.49.173
47	10.2.49.174/32	10.2.49.174 – 10.2.49.174	10.2.49.174
48	10.2.49.175/32	10.2.49.175 – 10.2.49.175	10.2.49.175
49	10.2.49.176/32	10.2.49.176 – 10.2.49.176	10.2.49.176
50	10.2.49.177/32	10.2.49.177 – 10.2.49.177	10.2.49.177
51	10.2.49.178/32	10.2.49.178 – 10.2.49.178	10.2.49.178
52	10.2.49.179/32	10.2.49.179 – 10.2.49.179	10.2.49.179
53	10.2.49.180/32	10.2.49.180 – 10.2.49.180	10.2.49.180
54	10.2.49.181/32	10.2.49.181 – 10.2.49.181	10.2.49.181
55	10.2.49.182/32	10.2.49.182 – 10.2.49.182	10.2.49.182
56	10.2.49.183/32	10.2.49.183 – 10.2.49.183	10.2.49.183
57	10.2.49.184/32	10.2.49.184 – 10.2.49.184	10.2.49.184
58	10.2.49.185/32	10.2.49.185 – 10.2.49.185	10.2.49.185
59	10.2.49.186/32	10.2.49.186 – 10.2.49.186	10.2.49.186
60	10.2.49.187/32	10.2.49.187 – 10.2.49.187	10.2.49.187
61	10.2.49.188/32	10.2.49.188 – 10.2.49.188	10.2.49.188
62	10.2.49.189/32	10.2.49.189 – 10.2.49.189	10.2.49.189
63	10.2.49.190/32	10.2.49.190 – 10.2.49.190	10.2.49.190
64	10.2.49.191/32	10.2.49.191 – 10.2.49.191	10.2.49.191
65	10.2.49.192/32	10.2.49.192 – 10.2.49.192	10.2.49.192
66	10.2.49.193/32	10.2.49.193 – 10.2.49.193	10.2.49.193
67	10.2.49.194/32	10.2.49.194 – 10.2.49.194	10.2.49.194
68	10.2.49.195/32	10.2.49.195 – 10.2.49.195	10.2.49.195
69	10.2.49.196/32	10.2.49.196 – 10.2.49.196	10.2.49.196
70	10.2.49.197/32	10.2.49.197 – 10.2.49.197	10.2.49.197
71	10.2.49.198/32	10.2.49.198 – 10.2.49.198	10.2.49.198
72	10.2.49.199/32	10.2.49.199 – 10.2.49.199	10.2.49.199
73	10.2.49.200/32	10.2.49.200 – 10.2.49.200	10.2.49.200
74	10.2.49.201/32	10.2.49.201 – 10.2.49.201	10.2.49.201
75	10.2.49.202/32	10.2.49.202 – 10.2.49.202	10.2.49.202
76	10.2.49.203/32	10.2.49.203 – 10.2.49.203	10.2.49.203
77	10.2.49.204/32	10.2.49.204 – 10.2.49.204	10.2.49.204
78	10.2.49.205/32	10.2.49.205 – 10.2.49.205	10.2.49.205
79	10.2.49.206/32	10.2.49.206 – 10.2.49.206	10.2.49.206
80	10.2.49.207/32	10.2.49.207 – 10.2.49.207	10.2.49.207
81	10.2.49.208/32	10.2.49.208 – 10.2.49.208	10.2.49.208
82	10.2.49.209/32	10.2.49.209 – 10.2.49.209	10.2.49.209
83	10.2.49.210/32	10.2.49.210 – 10.2.49.210	10.2.49.210
84	10.2.49.211/32	10.2.49.211 – 10.2.49.211	10.2.49.211
85	10.2.49.212/32	10.2.49.212 – 10.2.49.212	10.2.49.212
86	10.2.49.213/32	10.2.49.213 – 10.2.49.213	10.2.49.213
87	10.2.49.214/32	10.2.49.214 – 10.2.49.214	10.2.49.214
88	10.2.49.215/32	10.2.49.215 – 10.2.49.215	10.2.49.215
89	10.2.49.216/32	10.2.49.216 – 10.2.49.216	10.2.49.216
90	10.2.49.217/32	10.2.49.217 – 10.2.49.217	10.2.49.217
91	10.2.49.218/32	10.2.49.218 – 10.2.49.218	10.2.49.218
92	10.2.49.219/32	10.2.49.219 – 10.2.49.219	10.2.49.219
93	10.2.49.220/32	10.2.49.220 – 10.2.49.220	10.2.49.220
94	10.2.49.221/32	10.2.49.221 – 10.2.49.221	10.2.49.221
95	10.2.49.222/32	10.2.49.222 – 10.2.49.222	10.2.49.222
96	10.2.49.223/32	10.2.49.223 – 10.2.49.223	10.2.49.223
97	10.2.49.224/32	10.2.49.224 – 10.2.49.224	10.2.49.224
98	10.2.49.225/32	10.2.49.225 – 10.2.49.225	10.2.49.225
99	10.2.49.226/32	10.2.49.226 – 10.2.49.226	10.2.49.226
100	10.2.49.227/32	10.2.49.227 – 10.2.49.227	10.2.49.227
101	10.2.49.228/32	10.2.49.228 – 10.2.49.228	10.2.49.228
102	10.2.49.229/32	10.2.49.229 – 10.2.49.229	10.2.49.229
103	10.2.49.230/32	10.2.49.230 – 10.2.49.230	10.2.49.230
104	10.2.49.231/32	10.2.49.231 – 10.2.49.231	10.2.49.231
105	10.2.49.232/32	10.2.49.232 – 10.2.49.232	10.2.49.232
106	10.2.49.233/32	10.2.49.233 – 10.2.49.233	10.2.49.233
107	10.2.49.234/32	10.2.49.234 – 10.2.49.234	10.2.49.234
108	10.2.49.235/32	10.2.49.235 – 10.2.49.235	10.2.49.235
109	10.2.49.236/32	10.2.49.236 – 10.2.49.236	10.2.49.236
110	10.2.49.237/32	10.2.49.237 – 10.2.49.237	10.2.49.237
111	10.2.49.238/32	10.2.49.238 – 10.2.49.238	10.2.49.238
112	10.2.49.239/32	10.2.49.239 – 10.2.49.239	10.2.49.239
113	10.2.49.240/32	10.2.49.240 – 10.2.49.240	10.2.49.240
114	10.2.49.241/32	10.2.49.241 – 10.2.49.241	10.2.49.241
115	10.2.49.242/32	10.2.49.242 – 10.2.49.242	10.2.49.242
116	10.2.49.243/32	10.2.49.243 – 10.2.49.243	10.2.49.243
117	10.2.49.244/32	10.2.49.244 – 10.2.49.244	10.2.49.244
118	10.2.49.245/32	10.2.49.245 – 10.2.49.245	10.2.49.245
119	10.2.49.246/32	10.2.49.246 – 10.2.49.246	10.2.49.246
120	10.2.49.247/32	10.2.49.247 – 10.2.49.247	10.2.49.247
121	10.2.49.248/32	10.2.49.248 – 10.2.49.248	10.2.49.248
122	10.2.49.249/32	10.2.49.249 – 10.2.49.249	10.2.49.249
123	10.2.49.250/32	10.2.49.250 – 10.2.49.250	10.2.49.250
124	10.2.49.251/32	10.2.49.251 – 10.2.49.251	10.2.49.251
125	10.2.49.252/32	10.2.49.252 – 10.2.49.252	10.2.49.252
126	10.2.49.253/32	10.2.49.253 – 10.2.49.253	10.2.49.253
127	10.2.49.254/32	10.2.49.254 – 10.2.49.254	10.2.49.254
128	10.2.49.255/32	10.2.49.255 – 10.2.49.255	10.2.49.255

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 →