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)10.3.184.0/21

network10.3.184.0/21

broadcast10.3.191.255

first host10.3.184.1

last host10.3.191.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.184.0/21

address00001010.00000011.10111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.10111000.00000000

broadcast00001010.00000011.10111111.11111111

green = network part, grey = host part

hex0x0a03b800

decimal168015872

reverse dns0.184.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:b800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.184.0/30	10.3.184.1 – 10.3.184.2	10.3.184.3
2	10.3.184.4/30	10.3.184.5 – 10.3.184.6	10.3.184.7
3	10.3.184.8/30	10.3.184.9 – 10.3.184.10	10.3.184.11
4	10.3.184.12/30	10.3.184.13 – 10.3.184.14	10.3.184.15
5	10.3.184.16/30	10.3.184.17 – 10.3.184.18	10.3.184.19
6	10.3.184.20/30	10.3.184.21 – 10.3.184.22	10.3.184.23
7	10.3.184.24/30	10.3.184.25 – 10.3.184.26	10.3.184.27
8	10.3.184.28/30	10.3.184.29 – 10.3.184.30	10.3.184.31
9	10.3.184.32/30	10.3.184.33 – 10.3.184.34	10.3.184.35
10	10.3.184.36/30	10.3.184.37 – 10.3.184.38	10.3.184.39
11	10.3.184.40/30	10.3.184.41 – 10.3.184.42	10.3.184.43
12	10.3.184.44/30	10.3.184.45 – 10.3.184.46	10.3.184.47
13	10.3.184.48/30	10.3.184.49 – 10.3.184.50	10.3.184.51
14	10.3.184.52/30	10.3.184.53 – 10.3.184.54	10.3.184.55
15	10.3.184.56/30	10.3.184.57 – 10.3.184.58	10.3.184.59
16	10.3.184.60/30	10.3.184.61 – 10.3.184.62	10.3.184.63
17	10.3.184.64/30	10.3.184.65 – 10.3.184.66	10.3.184.67
18	10.3.184.68/30	10.3.184.69 – 10.3.184.70	10.3.184.71
19	10.3.184.72/30	10.3.184.73 – 10.3.184.74	10.3.184.75
20	10.3.184.76/30	10.3.184.77 – 10.3.184.78	10.3.184.79
21	10.3.184.80/30	10.3.184.81 – 10.3.184.82	10.3.184.83
22	10.3.184.84/30	10.3.184.85 – 10.3.184.86	10.3.184.87
23	10.3.184.88/30	10.3.184.89 – 10.3.184.90	10.3.184.91
24	10.3.184.92/30	10.3.184.93 – 10.3.184.94	10.3.184.95
25	10.3.184.96/30	10.3.184.97 – 10.3.184.98	10.3.184.99
26	10.3.184.100/30	10.3.184.101 – 10.3.184.102	10.3.184.103
27	10.3.184.104/30	10.3.184.105 – 10.3.184.106	10.3.184.107
28	10.3.184.108/30	10.3.184.109 – 10.3.184.110	10.3.184.111
29	10.3.184.112/30	10.3.184.113 – 10.3.184.114	10.3.184.115
30	10.3.184.116/30	10.3.184.117 – 10.3.184.118	10.3.184.119
31	10.3.184.120/30	10.3.184.121 – 10.3.184.122	10.3.184.123
32	10.3.184.124/30	10.3.184.125 – 10.3.184.126	10.3.184.127
33	10.3.184.128/30	10.3.184.129 – 10.3.184.130	10.3.184.131
34	10.3.184.132/30	10.3.184.133 – 10.3.184.134	10.3.184.135
35	10.3.184.136/30	10.3.184.137 – 10.3.184.138	10.3.184.139
36	10.3.184.140/30	10.3.184.141 – 10.3.184.142	10.3.184.143
37	10.3.184.144/30	10.3.184.145 – 10.3.184.146	10.3.184.147
38	10.3.184.148/30	10.3.184.149 – 10.3.184.150	10.3.184.151
39	10.3.184.152/30	10.3.184.153 – 10.3.184.154	10.3.184.155
40	10.3.184.156/30	10.3.184.157 – 10.3.184.158	10.3.184.159
41	10.3.184.160/30	10.3.184.161 – 10.3.184.162	10.3.184.163
42	10.3.184.164/30	10.3.184.165 – 10.3.184.166	10.3.184.167
43	10.3.184.168/30	10.3.184.169 – 10.3.184.170	10.3.184.171
44	10.3.184.172/30	10.3.184.173 – 10.3.184.174	10.3.184.175
45	10.3.184.176/30	10.3.184.177 – 10.3.184.178	10.3.184.179
46	10.3.184.180/30	10.3.184.181 – 10.3.184.182	10.3.184.183
47	10.3.184.184/30	10.3.184.185 – 10.3.184.186	10.3.184.187
48	10.3.184.188/30	10.3.184.189 – 10.3.184.190	10.3.184.191
49	10.3.184.192/30	10.3.184.193 – 10.3.184.194	10.3.184.195
50	10.3.184.196/30	10.3.184.197 – 10.3.184.198	10.3.184.199
51	10.3.184.200/30	10.3.184.201 – 10.3.184.202	10.3.184.203
52	10.3.184.204/30	10.3.184.205 – 10.3.184.206	10.3.184.207
53	10.3.184.208/30	10.3.184.209 – 10.3.184.210	10.3.184.211
54	10.3.184.212/30	10.3.184.213 – 10.3.184.214	10.3.184.215
55	10.3.184.216/30	10.3.184.217 – 10.3.184.218	10.3.184.219
56	10.3.184.220/30	10.3.184.221 – 10.3.184.222	10.3.184.223
57	10.3.184.224/30	10.3.184.225 – 10.3.184.226	10.3.184.227
58	10.3.184.228/30	10.3.184.229 – 10.3.184.230	10.3.184.231
59	10.3.184.232/30	10.3.184.233 – 10.3.184.234	10.3.184.235
60	10.3.184.236/30	10.3.184.237 – 10.3.184.238	10.3.184.239
61	10.3.184.240/30	10.3.184.241 – 10.3.184.242	10.3.184.243
62	10.3.184.244/30	10.3.184.245 – 10.3.184.246	10.3.184.247
63	10.3.184.248/30	10.3.184.249 – 10.3.184.250	10.3.184.251
64	10.3.184.252/30	10.3.184.253 – 10.3.184.254	10.3.184.255
65	10.3.185.0/30	10.3.185.1 – 10.3.185.2	10.3.185.3
66	10.3.185.4/30	10.3.185.5 – 10.3.185.6	10.3.185.7
67	10.3.185.8/30	10.3.185.9 – 10.3.185.10	10.3.185.11
68	10.3.185.12/30	10.3.185.13 – 10.3.185.14	10.3.185.15
69	10.3.185.16/30	10.3.185.17 – 10.3.185.18	10.3.185.19
70	10.3.185.20/30	10.3.185.21 – 10.3.185.22	10.3.185.23
71	10.3.185.24/30	10.3.185.25 – 10.3.185.26	10.3.185.27
72	10.3.185.28/30	10.3.185.29 – 10.3.185.30	10.3.185.31
73	10.3.185.32/30	10.3.185.33 – 10.3.185.34	10.3.185.35
74	10.3.185.36/30	10.3.185.37 – 10.3.185.38	10.3.185.39
75	10.3.185.40/30	10.3.185.41 – 10.3.185.42	10.3.185.43
76	10.3.185.44/30	10.3.185.45 – 10.3.185.46	10.3.185.47
77	10.3.185.48/30	10.3.185.49 – 10.3.185.50	10.3.185.51
78	10.3.185.52/30	10.3.185.53 – 10.3.185.54	10.3.185.55
79	10.3.185.56/30	10.3.185.57 – 10.3.185.58	10.3.185.59
80	10.3.185.60/30	10.3.185.61 – 10.3.185.62	10.3.185.63
81	10.3.185.64/30	10.3.185.65 – 10.3.185.66	10.3.185.67
82	10.3.185.68/30	10.3.185.69 – 10.3.185.70	10.3.185.71
83	10.3.185.72/30	10.3.185.73 – 10.3.185.74	10.3.185.75
84	10.3.185.76/30	10.3.185.77 – 10.3.185.78	10.3.185.79
85	10.3.185.80/30	10.3.185.81 – 10.3.185.82	10.3.185.83
86	10.3.185.84/30	10.3.185.85 – 10.3.185.86	10.3.185.87
87	10.3.185.88/30	10.3.185.89 – 10.3.185.90	10.3.185.91
88	10.3.185.92/30	10.3.185.93 – 10.3.185.94	10.3.185.95
89	10.3.185.96/30	10.3.185.97 – 10.3.185.98	10.3.185.99
90	10.3.185.100/30	10.3.185.101 – 10.3.185.102	10.3.185.103
91	10.3.185.104/30	10.3.185.105 – 10.3.185.106	10.3.185.107
92	10.3.185.108/30	10.3.185.109 – 10.3.185.110	10.3.185.111
93	10.3.185.112/30	10.3.185.113 – 10.3.185.114	10.3.185.115
94	10.3.185.116/30	10.3.185.117 – 10.3.185.118	10.3.185.119
95	10.3.185.120/30	10.3.185.121 – 10.3.185.122	10.3.185.123
96	10.3.185.124/30	10.3.185.125 – 10.3.185.126	10.3.185.127
97	10.3.185.128/30	10.3.185.129 – 10.3.185.130	10.3.185.131
98	10.3.185.132/30	10.3.185.133 – 10.3.185.134	10.3.185.135
99	10.3.185.136/30	10.3.185.137 – 10.3.185.138	10.3.185.139
100	10.3.185.140/30	10.3.185.141 – 10.3.185.142	10.3.185.143
101	10.3.185.144/30	10.3.185.145 – 10.3.185.146	10.3.185.147
102	10.3.185.148/30	10.3.185.149 – 10.3.185.150	10.3.185.151
103	10.3.185.152/30	10.3.185.153 – 10.3.185.154	10.3.185.155
104	10.3.185.156/30	10.3.185.157 – 10.3.185.158	10.3.185.159
105	10.3.185.160/30	10.3.185.161 – 10.3.185.162	10.3.185.163
106	10.3.185.164/30	10.3.185.165 – 10.3.185.166	10.3.185.167
107	10.3.185.168/30	10.3.185.169 – 10.3.185.170	10.3.185.171
108	10.3.185.172/30	10.3.185.173 – 10.3.185.174	10.3.185.175
109	10.3.185.176/30	10.3.185.177 – 10.3.185.178	10.3.185.179
110	10.3.185.180/30	10.3.185.181 – 10.3.185.182	10.3.185.183
111	10.3.185.184/30	10.3.185.185 – 10.3.185.186	10.3.185.187
112	10.3.185.188/30	10.3.185.189 – 10.3.185.190	10.3.185.191
113	10.3.185.192/30	10.3.185.193 – 10.3.185.194	10.3.185.195
114	10.3.185.196/30	10.3.185.197 – 10.3.185.198	10.3.185.199
115	10.3.185.200/30	10.3.185.201 – 10.3.185.202	10.3.185.203
116	10.3.185.204/30	10.3.185.205 – 10.3.185.206	10.3.185.207
117	10.3.185.208/30	10.3.185.209 – 10.3.185.210	10.3.185.211
118	10.3.185.212/30	10.3.185.213 – 10.3.185.214	10.3.185.215
119	10.3.185.216/30	10.3.185.217 – 10.3.185.218	10.3.185.219
120	10.3.185.220/30	10.3.185.221 – 10.3.185.222	10.3.185.223
121	10.3.185.224/30	10.3.185.225 – 10.3.185.226	10.3.185.227
122	10.3.185.228/30	10.3.185.229 – 10.3.185.230	10.3.185.231
123	10.3.185.232/30	10.3.185.233 – 10.3.185.234	10.3.185.235
124	10.3.185.236/30	10.3.185.237 – 10.3.185.238	10.3.185.239
125	10.3.185.240/30	10.3.185.241 – 10.3.185.242	10.3.185.243
126	10.3.185.244/30	10.3.185.245 – 10.3.185.246	10.3.185.247
127	10.3.185.248/30	10.3.185.249 – 10.3.185.250	10.3.185.251
128	10.3.185.252/30	10.3.185.253 – 10.3.185.254	10.3.185.255
129	10.3.186.0/30	10.3.186.1 – 10.3.186.2	10.3.186.3
130	10.3.186.4/30	10.3.186.5 – 10.3.186.6	10.3.186.7
131	10.3.186.8/30	10.3.186.9 – 10.3.186.10	10.3.186.11
132	10.3.186.12/30	10.3.186.13 – 10.3.186.14	10.3.186.15
133	10.3.186.16/30	10.3.186.17 – 10.3.186.18	10.3.186.19
134	10.3.186.20/30	10.3.186.21 – 10.3.186.22	10.3.186.23
135	10.3.186.24/30	10.3.186.25 – 10.3.186.26	10.3.186.27
136	10.3.186.28/30	10.3.186.29 – 10.3.186.30	10.3.186.31
137	10.3.186.32/30	10.3.186.33 – 10.3.186.34	10.3.186.35
138	10.3.186.36/30	10.3.186.37 – 10.3.186.38	10.3.186.39
139	10.3.186.40/30	10.3.186.41 – 10.3.186.42	10.3.186.43
140	10.3.186.44/30	10.3.186.45 – 10.3.186.46	10.3.186.47
141	10.3.186.48/30	10.3.186.49 – 10.3.186.50	10.3.186.51
142	10.3.186.52/30	10.3.186.53 – 10.3.186.54	10.3.186.55
143	10.3.186.56/30	10.3.186.57 – 10.3.186.58	10.3.186.59
144	10.3.186.60/30	10.3.186.61 – 10.3.186.62	10.3.186.63
145	10.3.186.64/30	10.3.186.65 – 10.3.186.66	10.3.186.67
146	10.3.186.68/30	10.3.186.69 – 10.3.186.70	10.3.186.71
147	10.3.186.72/30	10.3.186.73 – 10.3.186.74	10.3.186.75
148	10.3.186.76/30	10.3.186.77 – 10.3.186.78	10.3.186.79
149	10.3.186.80/30	10.3.186.81 – 10.3.186.82	10.3.186.83
150	10.3.186.84/30	10.3.186.85 – 10.3.186.86	10.3.186.87
151	10.3.186.88/30	10.3.186.89 – 10.3.186.90	10.3.186.91
152	10.3.186.92/30	10.3.186.93 – 10.3.186.94	10.3.186.95
153	10.3.186.96/30	10.3.186.97 – 10.3.186.98	10.3.186.99
154	10.3.186.100/30	10.3.186.101 – 10.3.186.102	10.3.186.103
155	10.3.186.104/30	10.3.186.105 – 10.3.186.106	10.3.186.107
156	10.3.186.108/30	10.3.186.109 – 10.3.186.110	10.3.186.111
157	10.3.186.112/30	10.3.186.113 – 10.3.186.114	10.3.186.115
158	10.3.186.116/30	10.3.186.117 – 10.3.186.118	10.3.186.119
159	10.3.186.120/30	10.3.186.121 – 10.3.186.122	10.3.186.123
160	10.3.186.124/30	10.3.186.125 – 10.3.186.126	10.3.186.127
161	10.3.186.128/30	10.3.186.129 – 10.3.186.130	10.3.186.131
162	10.3.186.132/30	10.3.186.133 – 10.3.186.134	10.3.186.135
163	10.3.186.136/30	10.3.186.137 – 10.3.186.138	10.3.186.139
164	10.3.186.140/30	10.3.186.141 – 10.3.186.142	10.3.186.143
165	10.3.186.144/30	10.3.186.145 – 10.3.186.146	10.3.186.147
166	10.3.186.148/30	10.3.186.149 – 10.3.186.150	10.3.186.151
167	10.3.186.152/30	10.3.186.153 – 10.3.186.154	10.3.186.155
168	10.3.186.156/30	10.3.186.157 – 10.3.186.158	10.3.186.159
169	10.3.186.160/30	10.3.186.161 – 10.3.186.162	10.3.186.163
170	10.3.186.164/30	10.3.186.165 – 10.3.186.166	10.3.186.167
171	10.3.186.168/30	10.3.186.169 – 10.3.186.170	10.3.186.171
172	10.3.186.172/30	10.3.186.173 – 10.3.186.174	10.3.186.175
173	10.3.186.176/30	10.3.186.177 – 10.3.186.178	10.3.186.179
174	10.3.186.180/30	10.3.186.181 – 10.3.186.182	10.3.186.183
175	10.3.186.184/30	10.3.186.185 – 10.3.186.186	10.3.186.187
176	10.3.186.188/30	10.3.186.189 – 10.3.186.190	10.3.186.191
177	10.3.186.192/30	10.3.186.193 – 10.3.186.194	10.3.186.195
178	10.3.186.196/30	10.3.186.197 – 10.3.186.198	10.3.186.199
179	10.3.186.200/30	10.3.186.201 – 10.3.186.202	10.3.186.203
180	10.3.186.204/30	10.3.186.205 – 10.3.186.206	10.3.186.207
181	10.3.186.208/30	10.3.186.209 – 10.3.186.210	10.3.186.211
182	10.3.186.212/30	10.3.186.213 – 10.3.186.214	10.3.186.215
183	10.3.186.216/30	10.3.186.217 – 10.3.186.218	10.3.186.219
184	10.3.186.220/30	10.3.186.221 – 10.3.186.222	10.3.186.223
185	10.3.186.224/30	10.3.186.225 – 10.3.186.226	10.3.186.227
186	10.3.186.228/30	10.3.186.229 – 10.3.186.230	10.3.186.231
187	10.3.186.232/30	10.3.186.233 – 10.3.186.234	10.3.186.235
188	10.3.186.236/30	10.3.186.237 – 10.3.186.238	10.3.186.239
189	10.3.186.240/30	10.3.186.241 – 10.3.186.242	10.3.186.243
190	10.3.186.244/30	10.3.186.245 – 10.3.186.246	10.3.186.247
191	10.3.186.248/30	10.3.186.249 – 10.3.186.250	10.3.186.251
192	10.3.186.252/30	10.3.186.253 – 10.3.186.254	10.3.186.255
193	10.3.187.0/30	10.3.187.1 – 10.3.187.2	10.3.187.3
194	10.3.187.4/30	10.3.187.5 – 10.3.187.6	10.3.187.7
195	10.3.187.8/30	10.3.187.9 – 10.3.187.10	10.3.187.11
196	10.3.187.12/30	10.3.187.13 – 10.3.187.14	10.3.187.15
197	10.3.187.16/30	10.3.187.17 – 10.3.187.18	10.3.187.19
198	10.3.187.20/30	10.3.187.21 – 10.3.187.22	10.3.187.23
199	10.3.187.24/30	10.3.187.25 – 10.3.187.26	10.3.187.27
200	10.3.187.28/30	10.3.187.29 – 10.3.187.30	10.3.187.31
201	10.3.187.32/30	10.3.187.33 – 10.3.187.34	10.3.187.35
202	10.3.187.36/30	10.3.187.37 – 10.3.187.38	10.3.187.39
203	10.3.187.40/30	10.3.187.41 – 10.3.187.42	10.3.187.43
204	10.3.187.44/30	10.3.187.45 – 10.3.187.46	10.3.187.47
205	10.3.187.48/30	10.3.187.49 – 10.3.187.50	10.3.187.51
206	10.3.187.52/30	10.3.187.53 – 10.3.187.54	10.3.187.55
207	10.3.187.56/30	10.3.187.57 – 10.3.187.58	10.3.187.59
208	10.3.187.60/30	10.3.187.61 – 10.3.187.62	10.3.187.63
209	10.3.187.64/30	10.3.187.65 – 10.3.187.66	10.3.187.67
210	10.3.187.68/30	10.3.187.69 – 10.3.187.70	10.3.187.71
211	10.3.187.72/30	10.3.187.73 – 10.3.187.74	10.3.187.75
212	10.3.187.76/30	10.3.187.77 – 10.3.187.78	10.3.187.79
213	10.3.187.80/30	10.3.187.81 – 10.3.187.82	10.3.187.83
214	10.3.187.84/30	10.3.187.85 – 10.3.187.86	10.3.187.87
215	10.3.187.88/30	10.3.187.89 – 10.3.187.90	10.3.187.91
216	10.3.187.92/30	10.3.187.93 – 10.3.187.94	10.3.187.95
217	10.3.187.96/30	10.3.187.97 – 10.3.187.98	10.3.187.99
218	10.3.187.100/30	10.3.187.101 – 10.3.187.102	10.3.187.103
219	10.3.187.104/30	10.3.187.105 – 10.3.187.106	10.3.187.107
220	10.3.187.108/30	10.3.187.109 – 10.3.187.110	10.3.187.111
221	10.3.187.112/30	10.3.187.113 – 10.3.187.114	10.3.187.115
222	10.3.187.116/30	10.3.187.117 – 10.3.187.118	10.3.187.119
223	10.3.187.120/30	10.3.187.121 – 10.3.187.122	10.3.187.123
224	10.3.187.124/30	10.3.187.125 – 10.3.187.126	10.3.187.127
225	10.3.187.128/30	10.3.187.129 – 10.3.187.130	10.3.187.131
226	10.3.187.132/30	10.3.187.133 – 10.3.187.134	10.3.187.135
227	10.3.187.136/30	10.3.187.137 – 10.3.187.138	10.3.187.139
228	10.3.187.140/30	10.3.187.141 – 10.3.187.142	10.3.187.143
229	10.3.187.144/30	10.3.187.145 – 10.3.187.146	10.3.187.147
230	10.3.187.148/30	10.3.187.149 – 10.3.187.150	10.3.187.151
231	10.3.187.152/30	10.3.187.153 – 10.3.187.154	10.3.187.155
232	10.3.187.156/30	10.3.187.157 – 10.3.187.158	10.3.187.159
233	10.3.187.160/30	10.3.187.161 – 10.3.187.162	10.3.187.163
234	10.3.187.164/30	10.3.187.165 – 10.3.187.166	10.3.187.167
235	10.3.187.168/30	10.3.187.169 – 10.3.187.170	10.3.187.171
236	10.3.187.172/30	10.3.187.173 – 10.3.187.174	10.3.187.175
237	10.3.187.176/30	10.3.187.177 – 10.3.187.178	10.3.187.179
238	10.3.187.180/30	10.3.187.181 – 10.3.187.182	10.3.187.183
239	10.3.187.184/30	10.3.187.185 – 10.3.187.186	10.3.187.187
240	10.3.187.188/30	10.3.187.189 – 10.3.187.190	10.3.187.191
241	10.3.187.192/30	10.3.187.193 – 10.3.187.194	10.3.187.195
242	10.3.187.196/30	10.3.187.197 – 10.3.187.198	10.3.187.199
243	10.3.187.200/30	10.3.187.201 – 10.3.187.202	10.3.187.203
244	10.3.187.204/30	10.3.187.205 – 10.3.187.206	10.3.187.207
245	10.3.187.208/30	10.3.187.209 – 10.3.187.210	10.3.187.211
246	10.3.187.212/30	10.3.187.213 – 10.3.187.214	10.3.187.215
247	10.3.187.216/30	10.3.187.217 – 10.3.187.218	10.3.187.219
248	10.3.187.220/30	10.3.187.221 – 10.3.187.222	10.3.187.223
249	10.3.187.224/30	10.3.187.225 – 10.3.187.226	10.3.187.227
250	10.3.187.228/30	10.3.187.229 – 10.3.187.230	10.3.187.231
251	10.3.187.232/30	10.3.187.233 – 10.3.187.234	10.3.187.235
252	10.3.187.236/30	10.3.187.237 – 10.3.187.238	10.3.187.239
253	10.3.187.240/30	10.3.187.241 – 10.3.187.242	10.3.187.243
254	10.3.187.244/30	10.3.187.245 – 10.3.187.246	10.3.187.247
255	10.3.187.248/30	10.3.187.249 – 10.3.187.250	10.3.187.251
256	10.3.187.252/30	10.3.187.253 – 10.3.187.254	10.3.187.255

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 →