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)10.2.232.0/21

network10.2.232.0/21

broadcast10.2.239.255

first host10.2.232.1

last host10.2.239.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.232.0/21

address00001010.00000010.11101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.11101000.00000000

broadcast00001010.00000010.11101111.11111111

green = network part, grey = host part

hex0x0a02e800

decimal167962624

reverse dns0.232.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:e800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.232.0/30	10.2.232.1 – 10.2.232.2	10.2.232.3
2	10.2.232.4/30	10.2.232.5 – 10.2.232.6	10.2.232.7
3	10.2.232.8/30	10.2.232.9 – 10.2.232.10	10.2.232.11
4	10.2.232.12/30	10.2.232.13 – 10.2.232.14	10.2.232.15
5	10.2.232.16/30	10.2.232.17 – 10.2.232.18	10.2.232.19
6	10.2.232.20/30	10.2.232.21 – 10.2.232.22	10.2.232.23
7	10.2.232.24/30	10.2.232.25 – 10.2.232.26	10.2.232.27
8	10.2.232.28/30	10.2.232.29 – 10.2.232.30	10.2.232.31
9	10.2.232.32/30	10.2.232.33 – 10.2.232.34	10.2.232.35
10	10.2.232.36/30	10.2.232.37 – 10.2.232.38	10.2.232.39
11	10.2.232.40/30	10.2.232.41 – 10.2.232.42	10.2.232.43
12	10.2.232.44/30	10.2.232.45 – 10.2.232.46	10.2.232.47
13	10.2.232.48/30	10.2.232.49 – 10.2.232.50	10.2.232.51
14	10.2.232.52/30	10.2.232.53 – 10.2.232.54	10.2.232.55
15	10.2.232.56/30	10.2.232.57 – 10.2.232.58	10.2.232.59
16	10.2.232.60/30	10.2.232.61 – 10.2.232.62	10.2.232.63
17	10.2.232.64/30	10.2.232.65 – 10.2.232.66	10.2.232.67
18	10.2.232.68/30	10.2.232.69 – 10.2.232.70	10.2.232.71
19	10.2.232.72/30	10.2.232.73 – 10.2.232.74	10.2.232.75
20	10.2.232.76/30	10.2.232.77 – 10.2.232.78	10.2.232.79
21	10.2.232.80/30	10.2.232.81 – 10.2.232.82	10.2.232.83
22	10.2.232.84/30	10.2.232.85 – 10.2.232.86	10.2.232.87
23	10.2.232.88/30	10.2.232.89 – 10.2.232.90	10.2.232.91
24	10.2.232.92/30	10.2.232.93 – 10.2.232.94	10.2.232.95
25	10.2.232.96/30	10.2.232.97 – 10.2.232.98	10.2.232.99
26	10.2.232.100/30	10.2.232.101 – 10.2.232.102	10.2.232.103
27	10.2.232.104/30	10.2.232.105 – 10.2.232.106	10.2.232.107
28	10.2.232.108/30	10.2.232.109 – 10.2.232.110	10.2.232.111
29	10.2.232.112/30	10.2.232.113 – 10.2.232.114	10.2.232.115
30	10.2.232.116/30	10.2.232.117 – 10.2.232.118	10.2.232.119
31	10.2.232.120/30	10.2.232.121 – 10.2.232.122	10.2.232.123
32	10.2.232.124/30	10.2.232.125 – 10.2.232.126	10.2.232.127
33	10.2.232.128/30	10.2.232.129 – 10.2.232.130	10.2.232.131
34	10.2.232.132/30	10.2.232.133 – 10.2.232.134	10.2.232.135
35	10.2.232.136/30	10.2.232.137 – 10.2.232.138	10.2.232.139
36	10.2.232.140/30	10.2.232.141 – 10.2.232.142	10.2.232.143
37	10.2.232.144/30	10.2.232.145 – 10.2.232.146	10.2.232.147
38	10.2.232.148/30	10.2.232.149 – 10.2.232.150	10.2.232.151
39	10.2.232.152/30	10.2.232.153 – 10.2.232.154	10.2.232.155
40	10.2.232.156/30	10.2.232.157 – 10.2.232.158	10.2.232.159
41	10.2.232.160/30	10.2.232.161 – 10.2.232.162	10.2.232.163
42	10.2.232.164/30	10.2.232.165 – 10.2.232.166	10.2.232.167
43	10.2.232.168/30	10.2.232.169 – 10.2.232.170	10.2.232.171
44	10.2.232.172/30	10.2.232.173 – 10.2.232.174	10.2.232.175
45	10.2.232.176/30	10.2.232.177 – 10.2.232.178	10.2.232.179
46	10.2.232.180/30	10.2.232.181 – 10.2.232.182	10.2.232.183
47	10.2.232.184/30	10.2.232.185 – 10.2.232.186	10.2.232.187
48	10.2.232.188/30	10.2.232.189 – 10.2.232.190	10.2.232.191
49	10.2.232.192/30	10.2.232.193 – 10.2.232.194	10.2.232.195
50	10.2.232.196/30	10.2.232.197 – 10.2.232.198	10.2.232.199
51	10.2.232.200/30	10.2.232.201 – 10.2.232.202	10.2.232.203
52	10.2.232.204/30	10.2.232.205 – 10.2.232.206	10.2.232.207
53	10.2.232.208/30	10.2.232.209 – 10.2.232.210	10.2.232.211
54	10.2.232.212/30	10.2.232.213 – 10.2.232.214	10.2.232.215
55	10.2.232.216/30	10.2.232.217 – 10.2.232.218	10.2.232.219
56	10.2.232.220/30	10.2.232.221 – 10.2.232.222	10.2.232.223
57	10.2.232.224/30	10.2.232.225 – 10.2.232.226	10.2.232.227
58	10.2.232.228/30	10.2.232.229 – 10.2.232.230	10.2.232.231
59	10.2.232.232/30	10.2.232.233 – 10.2.232.234	10.2.232.235
60	10.2.232.236/30	10.2.232.237 – 10.2.232.238	10.2.232.239
61	10.2.232.240/30	10.2.232.241 – 10.2.232.242	10.2.232.243
62	10.2.232.244/30	10.2.232.245 – 10.2.232.246	10.2.232.247
63	10.2.232.248/30	10.2.232.249 – 10.2.232.250	10.2.232.251
64	10.2.232.252/30	10.2.232.253 – 10.2.232.254	10.2.232.255
65	10.2.233.0/30	10.2.233.1 – 10.2.233.2	10.2.233.3
66	10.2.233.4/30	10.2.233.5 – 10.2.233.6	10.2.233.7
67	10.2.233.8/30	10.2.233.9 – 10.2.233.10	10.2.233.11
68	10.2.233.12/30	10.2.233.13 – 10.2.233.14	10.2.233.15
69	10.2.233.16/30	10.2.233.17 – 10.2.233.18	10.2.233.19
70	10.2.233.20/30	10.2.233.21 – 10.2.233.22	10.2.233.23
71	10.2.233.24/30	10.2.233.25 – 10.2.233.26	10.2.233.27
72	10.2.233.28/30	10.2.233.29 – 10.2.233.30	10.2.233.31
73	10.2.233.32/30	10.2.233.33 – 10.2.233.34	10.2.233.35
74	10.2.233.36/30	10.2.233.37 – 10.2.233.38	10.2.233.39
75	10.2.233.40/30	10.2.233.41 – 10.2.233.42	10.2.233.43
76	10.2.233.44/30	10.2.233.45 – 10.2.233.46	10.2.233.47
77	10.2.233.48/30	10.2.233.49 – 10.2.233.50	10.2.233.51
78	10.2.233.52/30	10.2.233.53 – 10.2.233.54	10.2.233.55
79	10.2.233.56/30	10.2.233.57 – 10.2.233.58	10.2.233.59
80	10.2.233.60/30	10.2.233.61 – 10.2.233.62	10.2.233.63
81	10.2.233.64/30	10.2.233.65 – 10.2.233.66	10.2.233.67
82	10.2.233.68/30	10.2.233.69 – 10.2.233.70	10.2.233.71
83	10.2.233.72/30	10.2.233.73 – 10.2.233.74	10.2.233.75
84	10.2.233.76/30	10.2.233.77 – 10.2.233.78	10.2.233.79
85	10.2.233.80/30	10.2.233.81 – 10.2.233.82	10.2.233.83
86	10.2.233.84/30	10.2.233.85 – 10.2.233.86	10.2.233.87
87	10.2.233.88/30	10.2.233.89 – 10.2.233.90	10.2.233.91
88	10.2.233.92/30	10.2.233.93 – 10.2.233.94	10.2.233.95
89	10.2.233.96/30	10.2.233.97 – 10.2.233.98	10.2.233.99
90	10.2.233.100/30	10.2.233.101 – 10.2.233.102	10.2.233.103
91	10.2.233.104/30	10.2.233.105 – 10.2.233.106	10.2.233.107
92	10.2.233.108/30	10.2.233.109 – 10.2.233.110	10.2.233.111
93	10.2.233.112/30	10.2.233.113 – 10.2.233.114	10.2.233.115
94	10.2.233.116/30	10.2.233.117 – 10.2.233.118	10.2.233.119
95	10.2.233.120/30	10.2.233.121 – 10.2.233.122	10.2.233.123
96	10.2.233.124/30	10.2.233.125 – 10.2.233.126	10.2.233.127
97	10.2.233.128/30	10.2.233.129 – 10.2.233.130	10.2.233.131
98	10.2.233.132/30	10.2.233.133 – 10.2.233.134	10.2.233.135
99	10.2.233.136/30	10.2.233.137 – 10.2.233.138	10.2.233.139
100	10.2.233.140/30	10.2.233.141 – 10.2.233.142	10.2.233.143
101	10.2.233.144/30	10.2.233.145 – 10.2.233.146	10.2.233.147
102	10.2.233.148/30	10.2.233.149 – 10.2.233.150	10.2.233.151
103	10.2.233.152/30	10.2.233.153 – 10.2.233.154	10.2.233.155
104	10.2.233.156/30	10.2.233.157 – 10.2.233.158	10.2.233.159
105	10.2.233.160/30	10.2.233.161 – 10.2.233.162	10.2.233.163
106	10.2.233.164/30	10.2.233.165 – 10.2.233.166	10.2.233.167
107	10.2.233.168/30	10.2.233.169 – 10.2.233.170	10.2.233.171
108	10.2.233.172/30	10.2.233.173 – 10.2.233.174	10.2.233.175
109	10.2.233.176/30	10.2.233.177 – 10.2.233.178	10.2.233.179
110	10.2.233.180/30	10.2.233.181 – 10.2.233.182	10.2.233.183
111	10.2.233.184/30	10.2.233.185 – 10.2.233.186	10.2.233.187
112	10.2.233.188/30	10.2.233.189 – 10.2.233.190	10.2.233.191
113	10.2.233.192/30	10.2.233.193 – 10.2.233.194	10.2.233.195
114	10.2.233.196/30	10.2.233.197 – 10.2.233.198	10.2.233.199
115	10.2.233.200/30	10.2.233.201 – 10.2.233.202	10.2.233.203
116	10.2.233.204/30	10.2.233.205 – 10.2.233.206	10.2.233.207
117	10.2.233.208/30	10.2.233.209 – 10.2.233.210	10.2.233.211
118	10.2.233.212/30	10.2.233.213 – 10.2.233.214	10.2.233.215
119	10.2.233.216/30	10.2.233.217 – 10.2.233.218	10.2.233.219
120	10.2.233.220/30	10.2.233.221 – 10.2.233.222	10.2.233.223
121	10.2.233.224/30	10.2.233.225 – 10.2.233.226	10.2.233.227
122	10.2.233.228/30	10.2.233.229 – 10.2.233.230	10.2.233.231
123	10.2.233.232/30	10.2.233.233 – 10.2.233.234	10.2.233.235
124	10.2.233.236/30	10.2.233.237 – 10.2.233.238	10.2.233.239
125	10.2.233.240/30	10.2.233.241 – 10.2.233.242	10.2.233.243
126	10.2.233.244/30	10.2.233.245 – 10.2.233.246	10.2.233.247
127	10.2.233.248/30	10.2.233.249 – 10.2.233.250	10.2.233.251
128	10.2.233.252/30	10.2.233.253 – 10.2.233.254	10.2.233.255
129	10.2.234.0/30	10.2.234.1 – 10.2.234.2	10.2.234.3
130	10.2.234.4/30	10.2.234.5 – 10.2.234.6	10.2.234.7
131	10.2.234.8/30	10.2.234.9 – 10.2.234.10	10.2.234.11
132	10.2.234.12/30	10.2.234.13 – 10.2.234.14	10.2.234.15
133	10.2.234.16/30	10.2.234.17 – 10.2.234.18	10.2.234.19
134	10.2.234.20/30	10.2.234.21 – 10.2.234.22	10.2.234.23
135	10.2.234.24/30	10.2.234.25 – 10.2.234.26	10.2.234.27
136	10.2.234.28/30	10.2.234.29 – 10.2.234.30	10.2.234.31
137	10.2.234.32/30	10.2.234.33 – 10.2.234.34	10.2.234.35
138	10.2.234.36/30	10.2.234.37 – 10.2.234.38	10.2.234.39
139	10.2.234.40/30	10.2.234.41 – 10.2.234.42	10.2.234.43
140	10.2.234.44/30	10.2.234.45 – 10.2.234.46	10.2.234.47
141	10.2.234.48/30	10.2.234.49 – 10.2.234.50	10.2.234.51
142	10.2.234.52/30	10.2.234.53 – 10.2.234.54	10.2.234.55
143	10.2.234.56/30	10.2.234.57 – 10.2.234.58	10.2.234.59
144	10.2.234.60/30	10.2.234.61 – 10.2.234.62	10.2.234.63
145	10.2.234.64/30	10.2.234.65 – 10.2.234.66	10.2.234.67
146	10.2.234.68/30	10.2.234.69 – 10.2.234.70	10.2.234.71
147	10.2.234.72/30	10.2.234.73 – 10.2.234.74	10.2.234.75
148	10.2.234.76/30	10.2.234.77 – 10.2.234.78	10.2.234.79
149	10.2.234.80/30	10.2.234.81 – 10.2.234.82	10.2.234.83
150	10.2.234.84/30	10.2.234.85 – 10.2.234.86	10.2.234.87
151	10.2.234.88/30	10.2.234.89 – 10.2.234.90	10.2.234.91
152	10.2.234.92/30	10.2.234.93 – 10.2.234.94	10.2.234.95
153	10.2.234.96/30	10.2.234.97 – 10.2.234.98	10.2.234.99
154	10.2.234.100/30	10.2.234.101 – 10.2.234.102	10.2.234.103
155	10.2.234.104/30	10.2.234.105 – 10.2.234.106	10.2.234.107
156	10.2.234.108/30	10.2.234.109 – 10.2.234.110	10.2.234.111
157	10.2.234.112/30	10.2.234.113 – 10.2.234.114	10.2.234.115
158	10.2.234.116/30	10.2.234.117 – 10.2.234.118	10.2.234.119
159	10.2.234.120/30	10.2.234.121 – 10.2.234.122	10.2.234.123
160	10.2.234.124/30	10.2.234.125 – 10.2.234.126	10.2.234.127
161	10.2.234.128/30	10.2.234.129 – 10.2.234.130	10.2.234.131
162	10.2.234.132/30	10.2.234.133 – 10.2.234.134	10.2.234.135
163	10.2.234.136/30	10.2.234.137 – 10.2.234.138	10.2.234.139
164	10.2.234.140/30	10.2.234.141 – 10.2.234.142	10.2.234.143
165	10.2.234.144/30	10.2.234.145 – 10.2.234.146	10.2.234.147
166	10.2.234.148/30	10.2.234.149 – 10.2.234.150	10.2.234.151
167	10.2.234.152/30	10.2.234.153 – 10.2.234.154	10.2.234.155
168	10.2.234.156/30	10.2.234.157 – 10.2.234.158	10.2.234.159
169	10.2.234.160/30	10.2.234.161 – 10.2.234.162	10.2.234.163
170	10.2.234.164/30	10.2.234.165 – 10.2.234.166	10.2.234.167
171	10.2.234.168/30	10.2.234.169 – 10.2.234.170	10.2.234.171
172	10.2.234.172/30	10.2.234.173 – 10.2.234.174	10.2.234.175
173	10.2.234.176/30	10.2.234.177 – 10.2.234.178	10.2.234.179
174	10.2.234.180/30	10.2.234.181 – 10.2.234.182	10.2.234.183
175	10.2.234.184/30	10.2.234.185 – 10.2.234.186	10.2.234.187
176	10.2.234.188/30	10.2.234.189 – 10.2.234.190	10.2.234.191
177	10.2.234.192/30	10.2.234.193 – 10.2.234.194	10.2.234.195
178	10.2.234.196/30	10.2.234.197 – 10.2.234.198	10.2.234.199
179	10.2.234.200/30	10.2.234.201 – 10.2.234.202	10.2.234.203
180	10.2.234.204/30	10.2.234.205 – 10.2.234.206	10.2.234.207
181	10.2.234.208/30	10.2.234.209 – 10.2.234.210	10.2.234.211
182	10.2.234.212/30	10.2.234.213 – 10.2.234.214	10.2.234.215
183	10.2.234.216/30	10.2.234.217 – 10.2.234.218	10.2.234.219
184	10.2.234.220/30	10.2.234.221 – 10.2.234.222	10.2.234.223
185	10.2.234.224/30	10.2.234.225 – 10.2.234.226	10.2.234.227
186	10.2.234.228/30	10.2.234.229 – 10.2.234.230	10.2.234.231
187	10.2.234.232/30	10.2.234.233 – 10.2.234.234	10.2.234.235
188	10.2.234.236/30	10.2.234.237 – 10.2.234.238	10.2.234.239
189	10.2.234.240/30	10.2.234.241 – 10.2.234.242	10.2.234.243
190	10.2.234.244/30	10.2.234.245 – 10.2.234.246	10.2.234.247
191	10.2.234.248/30	10.2.234.249 – 10.2.234.250	10.2.234.251
192	10.2.234.252/30	10.2.234.253 – 10.2.234.254	10.2.234.255
193	10.2.235.0/30	10.2.235.1 – 10.2.235.2	10.2.235.3
194	10.2.235.4/30	10.2.235.5 – 10.2.235.6	10.2.235.7
195	10.2.235.8/30	10.2.235.9 – 10.2.235.10	10.2.235.11
196	10.2.235.12/30	10.2.235.13 – 10.2.235.14	10.2.235.15
197	10.2.235.16/30	10.2.235.17 – 10.2.235.18	10.2.235.19
198	10.2.235.20/30	10.2.235.21 – 10.2.235.22	10.2.235.23
199	10.2.235.24/30	10.2.235.25 – 10.2.235.26	10.2.235.27
200	10.2.235.28/30	10.2.235.29 – 10.2.235.30	10.2.235.31
201	10.2.235.32/30	10.2.235.33 – 10.2.235.34	10.2.235.35
202	10.2.235.36/30	10.2.235.37 – 10.2.235.38	10.2.235.39
203	10.2.235.40/30	10.2.235.41 – 10.2.235.42	10.2.235.43
204	10.2.235.44/30	10.2.235.45 – 10.2.235.46	10.2.235.47
205	10.2.235.48/30	10.2.235.49 – 10.2.235.50	10.2.235.51
206	10.2.235.52/30	10.2.235.53 – 10.2.235.54	10.2.235.55
207	10.2.235.56/30	10.2.235.57 – 10.2.235.58	10.2.235.59
208	10.2.235.60/30	10.2.235.61 – 10.2.235.62	10.2.235.63
209	10.2.235.64/30	10.2.235.65 – 10.2.235.66	10.2.235.67
210	10.2.235.68/30	10.2.235.69 – 10.2.235.70	10.2.235.71
211	10.2.235.72/30	10.2.235.73 – 10.2.235.74	10.2.235.75
212	10.2.235.76/30	10.2.235.77 – 10.2.235.78	10.2.235.79
213	10.2.235.80/30	10.2.235.81 – 10.2.235.82	10.2.235.83
214	10.2.235.84/30	10.2.235.85 – 10.2.235.86	10.2.235.87
215	10.2.235.88/30	10.2.235.89 – 10.2.235.90	10.2.235.91
216	10.2.235.92/30	10.2.235.93 – 10.2.235.94	10.2.235.95
217	10.2.235.96/30	10.2.235.97 – 10.2.235.98	10.2.235.99
218	10.2.235.100/30	10.2.235.101 – 10.2.235.102	10.2.235.103
219	10.2.235.104/30	10.2.235.105 – 10.2.235.106	10.2.235.107
220	10.2.235.108/30	10.2.235.109 – 10.2.235.110	10.2.235.111
221	10.2.235.112/30	10.2.235.113 – 10.2.235.114	10.2.235.115
222	10.2.235.116/30	10.2.235.117 – 10.2.235.118	10.2.235.119
223	10.2.235.120/30	10.2.235.121 – 10.2.235.122	10.2.235.123
224	10.2.235.124/30	10.2.235.125 – 10.2.235.126	10.2.235.127
225	10.2.235.128/30	10.2.235.129 – 10.2.235.130	10.2.235.131
226	10.2.235.132/30	10.2.235.133 – 10.2.235.134	10.2.235.135
227	10.2.235.136/30	10.2.235.137 – 10.2.235.138	10.2.235.139
228	10.2.235.140/30	10.2.235.141 – 10.2.235.142	10.2.235.143
229	10.2.235.144/30	10.2.235.145 – 10.2.235.146	10.2.235.147
230	10.2.235.148/30	10.2.235.149 – 10.2.235.150	10.2.235.151
231	10.2.235.152/30	10.2.235.153 – 10.2.235.154	10.2.235.155
232	10.2.235.156/30	10.2.235.157 – 10.2.235.158	10.2.235.159
233	10.2.235.160/30	10.2.235.161 – 10.2.235.162	10.2.235.163
234	10.2.235.164/30	10.2.235.165 – 10.2.235.166	10.2.235.167
235	10.2.235.168/30	10.2.235.169 – 10.2.235.170	10.2.235.171
236	10.2.235.172/30	10.2.235.173 – 10.2.235.174	10.2.235.175
237	10.2.235.176/30	10.2.235.177 – 10.2.235.178	10.2.235.179
238	10.2.235.180/30	10.2.235.181 – 10.2.235.182	10.2.235.183
239	10.2.235.184/30	10.2.235.185 – 10.2.235.186	10.2.235.187
240	10.2.235.188/30	10.2.235.189 – 10.2.235.190	10.2.235.191
241	10.2.235.192/30	10.2.235.193 – 10.2.235.194	10.2.235.195
242	10.2.235.196/30	10.2.235.197 – 10.2.235.198	10.2.235.199
243	10.2.235.200/30	10.2.235.201 – 10.2.235.202	10.2.235.203
244	10.2.235.204/30	10.2.235.205 – 10.2.235.206	10.2.235.207
245	10.2.235.208/30	10.2.235.209 – 10.2.235.210	10.2.235.211
246	10.2.235.212/30	10.2.235.213 – 10.2.235.214	10.2.235.215
247	10.2.235.216/30	10.2.235.217 – 10.2.235.218	10.2.235.219
248	10.2.235.220/30	10.2.235.221 – 10.2.235.222	10.2.235.223
249	10.2.235.224/30	10.2.235.225 – 10.2.235.226	10.2.235.227
250	10.2.235.228/30	10.2.235.229 – 10.2.235.230	10.2.235.231
251	10.2.235.232/30	10.2.235.233 – 10.2.235.234	10.2.235.235
252	10.2.235.236/30	10.2.235.237 – 10.2.235.238	10.2.235.239
253	10.2.235.240/30	10.2.235.241 – 10.2.235.242	10.2.235.243
254	10.2.235.244/30	10.2.235.245 – 10.2.235.246	10.2.235.247
255	10.2.235.248/30	10.2.235.249 – 10.2.235.250	10.2.235.251
256	10.2.235.252/30	10.2.235.253 – 10.2.235.254	10.2.235.255

showing 256 of 512

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 /21
/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	1
/22	255.255.252.0	1,024	1,022	2 split →
/23	255.255.254.0	512	510	4 split →
/24	255.255.255.0	256	254	8 split →
/25	255.255.255.128	128	126	16 split →
/26	255.255.255.192	64	62	32 split →
/27	255.255.255.224	32	30	64 split →
/28	255.255.255.240	16	14	128 split →
/29	255.255.255.248	8	6	256 split →
/30	255.255.255.252	4	2	512 split →
/31	255.255.255.254	2	2	1,024 split →
/32	255.255.255.255	1	1	2,048 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 →