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)10.2.70.128/25

network10.2.70.128/25

broadcast10.2.70.255

first host10.2.70.129

last host10.2.70.254

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.70.128/25

address00001010.00000010.01000110.10000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01000110.10000000

broadcast00001010.00000010.01000110.11111111

green = network part, grey = host part

hex0x0a024680

decimal167921280

reverse dns128.70.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4680

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.70.128/32	10.2.70.128 – 10.2.70.128	10.2.70.128
2	10.2.70.129/32	10.2.70.129 – 10.2.70.129	10.2.70.129
3	10.2.70.130/32	10.2.70.130 – 10.2.70.130	10.2.70.130
4	10.2.70.131/32	10.2.70.131 – 10.2.70.131	10.2.70.131
5	10.2.70.132/32	10.2.70.132 – 10.2.70.132	10.2.70.132
6	10.2.70.133/32	10.2.70.133 – 10.2.70.133	10.2.70.133
7	10.2.70.134/32	10.2.70.134 – 10.2.70.134	10.2.70.134
8	10.2.70.135/32	10.2.70.135 – 10.2.70.135	10.2.70.135
9	10.2.70.136/32	10.2.70.136 – 10.2.70.136	10.2.70.136
10	10.2.70.137/32	10.2.70.137 – 10.2.70.137	10.2.70.137
11	10.2.70.138/32	10.2.70.138 – 10.2.70.138	10.2.70.138
12	10.2.70.139/32	10.2.70.139 – 10.2.70.139	10.2.70.139
13	10.2.70.140/32	10.2.70.140 – 10.2.70.140	10.2.70.140
14	10.2.70.141/32	10.2.70.141 – 10.2.70.141	10.2.70.141
15	10.2.70.142/32	10.2.70.142 – 10.2.70.142	10.2.70.142
16	10.2.70.143/32	10.2.70.143 – 10.2.70.143	10.2.70.143
17	10.2.70.144/32	10.2.70.144 – 10.2.70.144	10.2.70.144
18	10.2.70.145/32	10.2.70.145 – 10.2.70.145	10.2.70.145
19	10.2.70.146/32	10.2.70.146 – 10.2.70.146	10.2.70.146
20	10.2.70.147/32	10.2.70.147 – 10.2.70.147	10.2.70.147
21	10.2.70.148/32	10.2.70.148 – 10.2.70.148	10.2.70.148
22	10.2.70.149/32	10.2.70.149 – 10.2.70.149	10.2.70.149
23	10.2.70.150/32	10.2.70.150 – 10.2.70.150	10.2.70.150
24	10.2.70.151/32	10.2.70.151 – 10.2.70.151	10.2.70.151
25	10.2.70.152/32	10.2.70.152 – 10.2.70.152	10.2.70.152
26	10.2.70.153/32	10.2.70.153 – 10.2.70.153	10.2.70.153
27	10.2.70.154/32	10.2.70.154 – 10.2.70.154	10.2.70.154
28	10.2.70.155/32	10.2.70.155 – 10.2.70.155	10.2.70.155
29	10.2.70.156/32	10.2.70.156 – 10.2.70.156	10.2.70.156
30	10.2.70.157/32	10.2.70.157 – 10.2.70.157	10.2.70.157
31	10.2.70.158/32	10.2.70.158 – 10.2.70.158	10.2.70.158
32	10.2.70.159/32	10.2.70.159 – 10.2.70.159	10.2.70.159
33	10.2.70.160/32	10.2.70.160 – 10.2.70.160	10.2.70.160
34	10.2.70.161/32	10.2.70.161 – 10.2.70.161	10.2.70.161
35	10.2.70.162/32	10.2.70.162 – 10.2.70.162	10.2.70.162
36	10.2.70.163/32	10.2.70.163 – 10.2.70.163	10.2.70.163
37	10.2.70.164/32	10.2.70.164 – 10.2.70.164	10.2.70.164
38	10.2.70.165/32	10.2.70.165 – 10.2.70.165	10.2.70.165
39	10.2.70.166/32	10.2.70.166 – 10.2.70.166	10.2.70.166
40	10.2.70.167/32	10.2.70.167 – 10.2.70.167	10.2.70.167
41	10.2.70.168/32	10.2.70.168 – 10.2.70.168	10.2.70.168
42	10.2.70.169/32	10.2.70.169 – 10.2.70.169	10.2.70.169
43	10.2.70.170/32	10.2.70.170 – 10.2.70.170	10.2.70.170
44	10.2.70.171/32	10.2.70.171 – 10.2.70.171	10.2.70.171
45	10.2.70.172/32	10.2.70.172 – 10.2.70.172	10.2.70.172
46	10.2.70.173/32	10.2.70.173 – 10.2.70.173	10.2.70.173
47	10.2.70.174/32	10.2.70.174 – 10.2.70.174	10.2.70.174
48	10.2.70.175/32	10.2.70.175 – 10.2.70.175	10.2.70.175
49	10.2.70.176/32	10.2.70.176 – 10.2.70.176	10.2.70.176
50	10.2.70.177/32	10.2.70.177 – 10.2.70.177	10.2.70.177
51	10.2.70.178/32	10.2.70.178 – 10.2.70.178	10.2.70.178
52	10.2.70.179/32	10.2.70.179 – 10.2.70.179	10.2.70.179
53	10.2.70.180/32	10.2.70.180 – 10.2.70.180	10.2.70.180
54	10.2.70.181/32	10.2.70.181 – 10.2.70.181	10.2.70.181
55	10.2.70.182/32	10.2.70.182 – 10.2.70.182	10.2.70.182
56	10.2.70.183/32	10.2.70.183 – 10.2.70.183	10.2.70.183
57	10.2.70.184/32	10.2.70.184 – 10.2.70.184	10.2.70.184
58	10.2.70.185/32	10.2.70.185 – 10.2.70.185	10.2.70.185
59	10.2.70.186/32	10.2.70.186 – 10.2.70.186	10.2.70.186
60	10.2.70.187/32	10.2.70.187 – 10.2.70.187	10.2.70.187
61	10.2.70.188/32	10.2.70.188 – 10.2.70.188	10.2.70.188
62	10.2.70.189/32	10.2.70.189 – 10.2.70.189	10.2.70.189
63	10.2.70.190/32	10.2.70.190 – 10.2.70.190	10.2.70.190
64	10.2.70.191/32	10.2.70.191 – 10.2.70.191	10.2.70.191
65	10.2.70.192/32	10.2.70.192 – 10.2.70.192	10.2.70.192
66	10.2.70.193/32	10.2.70.193 – 10.2.70.193	10.2.70.193
67	10.2.70.194/32	10.2.70.194 – 10.2.70.194	10.2.70.194
68	10.2.70.195/32	10.2.70.195 – 10.2.70.195	10.2.70.195
69	10.2.70.196/32	10.2.70.196 – 10.2.70.196	10.2.70.196
70	10.2.70.197/32	10.2.70.197 – 10.2.70.197	10.2.70.197
71	10.2.70.198/32	10.2.70.198 – 10.2.70.198	10.2.70.198
72	10.2.70.199/32	10.2.70.199 – 10.2.70.199	10.2.70.199
73	10.2.70.200/32	10.2.70.200 – 10.2.70.200	10.2.70.200
74	10.2.70.201/32	10.2.70.201 – 10.2.70.201	10.2.70.201
75	10.2.70.202/32	10.2.70.202 – 10.2.70.202	10.2.70.202
76	10.2.70.203/32	10.2.70.203 – 10.2.70.203	10.2.70.203
77	10.2.70.204/32	10.2.70.204 – 10.2.70.204	10.2.70.204
78	10.2.70.205/32	10.2.70.205 – 10.2.70.205	10.2.70.205
79	10.2.70.206/32	10.2.70.206 – 10.2.70.206	10.2.70.206
80	10.2.70.207/32	10.2.70.207 – 10.2.70.207	10.2.70.207
81	10.2.70.208/32	10.2.70.208 – 10.2.70.208	10.2.70.208
82	10.2.70.209/32	10.2.70.209 – 10.2.70.209	10.2.70.209
83	10.2.70.210/32	10.2.70.210 – 10.2.70.210	10.2.70.210
84	10.2.70.211/32	10.2.70.211 – 10.2.70.211	10.2.70.211
85	10.2.70.212/32	10.2.70.212 – 10.2.70.212	10.2.70.212
86	10.2.70.213/32	10.2.70.213 – 10.2.70.213	10.2.70.213
87	10.2.70.214/32	10.2.70.214 – 10.2.70.214	10.2.70.214
88	10.2.70.215/32	10.2.70.215 – 10.2.70.215	10.2.70.215
89	10.2.70.216/32	10.2.70.216 – 10.2.70.216	10.2.70.216
90	10.2.70.217/32	10.2.70.217 – 10.2.70.217	10.2.70.217
91	10.2.70.218/32	10.2.70.218 – 10.2.70.218	10.2.70.218
92	10.2.70.219/32	10.2.70.219 – 10.2.70.219	10.2.70.219
93	10.2.70.220/32	10.2.70.220 – 10.2.70.220	10.2.70.220
94	10.2.70.221/32	10.2.70.221 – 10.2.70.221	10.2.70.221
95	10.2.70.222/32	10.2.70.222 – 10.2.70.222	10.2.70.222
96	10.2.70.223/32	10.2.70.223 – 10.2.70.223	10.2.70.223
97	10.2.70.224/32	10.2.70.224 – 10.2.70.224	10.2.70.224
98	10.2.70.225/32	10.2.70.225 – 10.2.70.225	10.2.70.225
99	10.2.70.226/32	10.2.70.226 – 10.2.70.226	10.2.70.226
100	10.2.70.227/32	10.2.70.227 – 10.2.70.227	10.2.70.227
101	10.2.70.228/32	10.2.70.228 – 10.2.70.228	10.2.70.228
102	10.2.70.229/32	10.2.70.229 – 10.2.70.229	10.2.70.229
103	10.2.70.230/32	10.2.70.230 – 10.2.70.230	10.2.70.230
104	10.2.70.231/32	10.2.70.231 – 10.2.70.231	10.2.70.231
105	10.2.70.232/32	10.2.70.232 – 10.2.70.232	10.2.70.232
106	10.2.70.233/32	10.2.70.233 – 10.2.70.233	10.2.70.233
107	10.2.70.234/32	10.2.70.234 – 10.2.70.234	10.2.70.234
108	10.2.70.235/32	10.2.70.235 – 10.2.70.235	10.2.70.235
109	10.2.70.236/32	10.2.70.236 – 10.2.70.236	10.2.70.236
110	10.2.70.237/32	10.2.70.237 – 10.2.70.237	10.2.70.237
111	10.2.70.238/32	10.2.70.238 – 10.2.70.238	10.2.70.238
112	10.2.70.239/32	10.2.70.239 – 10.2.70.239	10.2.70.239
113	10.2.70.240/32	10.2.70.240 – 10.2.70.240	10.2.70.240
114	10.2.70.241/32	10.2.70.241 – 10.2.70.241	10.2.70.241
115	10.2.70.242/32	10.2.70.242 – 10.2.70.242	10.2.70.242
116	10.2.70.243/32	10.2.70.243 – 10.2.70.243	10.2.70.243
117	10.2.70.244/32	10.2.70.244 – 10.2.70.244	10.2.70.244
118	10.2.70.245/32	10.2.70.245 – 10.2.70.245	10.2.70.245
119	10.2.70.246/32	10.2.70.246 – 10.2.70.246	10.2.70.246
120	10.2.70.247/32	10.2.70.247 – 10.2.70.247	10.2.70.247
121	10.2.70.248/32	10.2.70.248 – 10.2.70.248	10.2.70.248
122	10.2.70.249/32	10.2.70.249 – 10.2.70.249	10.2.70.249
123	10.2.70.250/32	10.2.70.250 – 10.2.70.250	10.2.70.250
124	10.2.70.251/32	10.2.70.251 – 10.2.70.251	10.2.70.251
125	10.2.70.252/32	10.2.70.252 – 10.2.70.252	10.2.70.252
126	10.2.70.253/32	10.2.70.253 – 10.2.70.253	10.2.70.253
127	10.2.70.254/32	10.2.70.254 – 10.2.70.254	10.2.70.254
128	10.2.70.255/32	10.2.70.255 – 10.2.70.255	10.2.70.255

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 →