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)10.3.192.0/21

network10.3.192.0/21

broadcast10.3.199.255

first host10.3.192.1

last host10.3.199.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.192.0/21

address00001010.00000011.11000000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.11000000.00000000

broadcast00001010.00000011.11000111.11111111

green = network part, grey = host part

hex0x0a03c000

decimal168017920

reverse dns0.192.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/30	10.3.192.1 – 10.3.192.2	10.3.192.3
2	10.3.192.4/30	10.3.192.5 – 10.3.192.6	10.3.192.7
3	10.3.192.8/30	10.3.192.9 – 10.3.192.10	10.3.192.11
4	10.3.192.12/30	10.3.192.13 – 10.3.192.14	10.3.192.15
5	10.3.192.16/30	10.3.192.17 – 10.3.192.18	10.3.192.19
6	10.3.192.20/30	10.3.192.21 – 10.3.192.22	10.3.192.23
7	10.3.192.24/30	10.3.192.25 – 10.3.192.26	10.3.192.27
8	10.3.192.28/30	10.3.192.29 – 10.3.192.30	10.3.192.31
9	10.3.192.32/30	10.3.192.33 – 10.3.192.34	10.3.192.35
10	10.3.192.36/30	10.3.192.37 – 10.3.192.38	10.3.192.39
11	10.3.192.40/30	10.3.192.41 – 10.3.192.42	10.3.192.43
12	10.3.192.44/30	10.3.192.45 – 10.3.192.46	10.3.192.47
13	10.3.192.48/30	10.3.192.49 – 10.3.192.50	10.3.192.51
14	10.3.192.52/30	10.3.192.53 – 10.3.192.54	10.3.192.55
15	10.3.192.56/30	10.3.192.57 – 10.3.192.58	10.3.192.59
16	10.3.192.60/30	10.3.192.61 – 10.3.192.62	10.3.192.63
17	10.3.192.64/30	10.3.192.65 – 10.3.192.66	10.3.192.67
18	10.3.192.68/30	10.3.192.69 – 10.3.192.70	10.3.192.71
19	10.3.192.72/30	10.3.192.73 – 10.3.192.74	10.3.192.75
20	10.3.192.76/30	10.3.192.77 – 10.3.192.78	10.3.192.79
21	10.3.192.80/30	10.3.192.81 – 10.3.192.82	10.3.192.83
22	10.3.192.84/30	10.3.192.85 – 10.3.192.86	10.3.192.87
23	10.3.192.88/30	10.3.192.89 – 10.3.192.90	10.3.192.91
24	10.3.192.92/30	10.3.192.93 – 10.3.192.94	10.3.192.95
25	10.3.192.96/30	10.3.192.97 – 10.3.192.98	10.3.192.99
26	10.3.192.100/30	10.3.192.101 – 10.3.192.102	10.3.192.103
27	10.3.192.104/30	10.3.192.105 – 10.3.192.106	10.3.192.107
28	10.3.192.108/30	10.3.192.109 – 10.3.192.110	10.3.192.111
29	10.3.192.112/30	10.3.192.113 – 10.3.192.114	10.3.192.115
30	10.3.192.116/30	10.3.192.117 – 10.3.192.118	10.3.192.119
31	10.3.192.120/30	10.3.192.121 – 10.3.192.122	10.3.192.123
32	10.3.192.124/30	10.3.192.125 – 10.3.192.126	10.3.192.127
33	10.3.192.128/30	10.3.192.129 – 10.3.192.130	10.3.192.131
34	10.3.192.132/30	10.3.192.133 – 10.3.192.134	10.3.192.135
35	10.3.192.136/30	10.3.192.137 – 10.3.192.138	10.3.192.139
36	10.3.192.140/30	10.3.192.141 – 10.3.192.142	10.3.192.143
37	10.3.192.144/30	10.3.192.145 – 10.3.192.146	10.3.192.147
38	10.3.192.148/30	10.3.192.149 – 10.3.192.150	10.3.192.151
39	10.3.192.152/30	10.3.192.153 – 10.3.192.154	10.3.192.155
40	10.3.192.156/30	10.3.192.157 – 10.3.192.158	10.3.192.159
41	10.3.192.160/30	10.3.192.161 – 10.3.192.162	10.3.192.163
42	10.3.192.164/30	10.3.192.165 – 10.3.192.166	10.3.192.167
43	10.3.192.168/30	10.3.192.169 – 10.3.192.170	10.3.192.171
44	10.3.192.172/30	10.3.192.173 – 10.3.192.174	10.3.192.175
45	10.3.192.176/30	10.3.192.177 – 10.3.192.178	10.3.192.179
46	10.3.192.180/30	10.3.192.181 – 10.3.192.182	10.3.192.183
47	10.3.192.184/30	10.3.192.185 – 10.3.192.186	10.3.192.187
48	10.3.192.188/30	10.3.192.189 – 10.3.192.190	10.3.192.191
49	10.3.192.192/30	10.3.192.193 – 10.3.192.194	10.3.192.195
50	10.3.192.196/30	10.3.192.197 – 10.3.192.198	10.3.192.199
51	10.3.192.200/30	10.3.192.201 – 10.3.192.202	10.3.192.203
52	10.3.192.204/30	10.3.192.205 – 10.3.192.206	10.3.192.207
53	10.3.192.208/30	10.3.192.209 – 10.3.192.210	10.3.192.211
54	10.3.192.212/30	10.3.192.213 – 10.3.192.214	10.3.192.215
55	10.3.192.216/30	10.3.192.217 – 10.3.192.218	10.3.192.219
56	10.3.192.220/30	10.3.192.221 – 10.3.192.222	10.3.192.223
57	10.3.192.224/30	10.3.192.225 – 10.3.192.226	10.3.192.227
58	10.3.192.228/30	10.3.192.229 – 10.3.192.230	10.3.192.231
59	10.3.192.232/30	10.3.192.233 – 10.3.192.234	10.3.192.235
60	10.3.192.236/30	10.3.192.237 – 10.3.192.238	10.3.192.239
61	10.3.192.240/30	10.3.192.241 – 10.3.192.242	10.3.192.243
62	10.3.192.244/30	10.3.192.245 – 10.3.192.246	10.3.192.247
63	10.3.192.248/30	10.3.192.249 – 10.3.192.250	10.3.192.251
64	10.3.192.252/30	10.3.192.253 – 10.3.192.254	10.3.192.255
65	10.3.193.0/30	10.3.193.1 – 10.3.193.2	10.3.193.3
66	10.3.193.4/30	10.3.193.5 – 10.3.193.6	10.3.193.7
67	10.3.193.8/30	10.3.193.9 – 10.3.193.10	10.3.193.11
68	10.3.193.12/30	10.3.193.13 – 10.3.193.14	10.3.193.15
69	10.3.193.16/30	10.3.193.17 – 10.3.193.18	10.3.193.19
70	10.3.193.20/30	10.3.193.21 – 10.3.193.22	10.3.193.23
71	10.3.193.24/30	10.3.193.25 – 10.3.193.26	10.3.193.27
72	10.3.193.28/30	10.3.193.29 – 10.3.193.30	10.3.193.31
73	10.3.193.32/30	10.3.193.33 – 10.3.193.34	10.3.193.35
74	10.3.193.36/30	10.3.193.37 – 10.3.193.38	10.3.193.39
75	10.3.193.40/30	10.3.193.41 – 10.3.193.42	10.3.193.43
76	10.3.193.44/30	10.3.193.45 – 10.3.193.46	10.3.193.47
77	10.3.193.48/30	10.3.193.49 – 10.3.193.50	10.3.193.51
78	10.3.193.52/30	10.3.193.53 – 10.3.193.54	10.3.193.55
79	10.3.193.56/30	10.3.193.57 – 10.3.193.58	10.3.193.59
80	10.3.193.60/30	10.3.193.61 – 10.3.193.62	10.3.193.63
81	10.3.193.64/30	10.3.193.65 – 10.3.193.66	10.3.193.67
82	10.3.193.68/30	10.3.193.69 – 10.3.193.70	10.3.193.71
83	10.3.193.72/30	10.3.193.73 – 10.3.193.74	10.3.193.75
84	10.3.193.76/30	10.3.193.77 – 10.3.193.78	10.3.193.79
85	10.3.193.80/30	10.3.193.81 – 10.3.193.82	10.3.193.83
86	10.3.193.84/30	10.3.193.85 – 10.3.193.86	10.3.193.87
87	10.3.193.88/30	10.3.193.89 – 10.3.193.90	10.3.193.91
88	10.3.193.92/30	10.3.193.93 – 10.3.193.94	10.3.193.95
89	10.3.193.96/30	10.3.193.97 – 10.3.193.98	10.3.193.99
90	10.3.193.100/30	10.3.193.101 – 10.3.193.102	10.3.193.103
91	10.3.193.104/30	10.3.193.105 – 10.3.193.106	10.3.193.107
92	10.3.193.108/30	10.3.193.109 – 10.3.193.110	10.3.193.111
93	10.3.193.112/30	10.3.193.113 – 10.3.193.114	10.3.193.115
94	10.3.193.116/30	10.3.193.117 – 10.3.193.118	10.3.193.119
95	10.3.193.120/30	10.3.193.121 – 10.3.193.122	10.3.193.123
96	10.3.193.124/30	10.3.193.125 – 10.3.193.126	10.3.193.127
97	10.3.193.128/30	10.3.193.129 – 10.3.193.130	10.3.193.131
98	10.3.193.132/30	10.3.193.133 – 10.3.193.134	10.3.193.135
99	10.3.193.136/30	10.3.193.137 – 10.3.193.138	10.3.193.139
100	10.3.193.140/30	10.3.193.141 – 10.3.193.142	10.3.193.143
101	10.3.193.144/30	10.3.193.145 – 10.3.193.146	10.3.193.147
102	10.3.193.148/30	10.3.193.149 – 10.3.193.150	10.3.193.151
103	10.3.193.152/30	10.3.193.153 – 10.3.193.154	10.3.193.155
104	10.3.193.156/30	10.3.193.157 – 10.3.193.158	10.3.193.159
105	10.3.193.160/30	10.3.193.161 – 10.3.193.162	10.3.193.163
106	10.3.193.164/30	10.3.193.165 – 10.3.193.166	10.3.193.167
107	10.3.193.168/30	10.3.193.169 – 10.3.193.170	10.3.193.171
108	10.3.193.172/30	10.3.193.173 – 10.3.193.174	10.3.193.175
109	10.3.193.176/30	10.3.193.177 – 10.3.193.178	10.3.193.179
110	10.3.193.180/30	10.3.193.181 – 10.3.193.182	10.3.193.183
111	10.3.193.184/30	10.3.193.185 – 10.3.193.186	10.3.193.187
112	10.3.193.188/30	10.3.193.189 – 10.3.193.190	10.3.193.191
113	10.3.193.192/30	10.3.193.193 – 10.3.193.194	10.3.193.195
114	10.3.193.196/30	10.3.193.197 – 10.3.193.198	10.3.193.199
115	10.3.193.200/30	10.3.193.201 – 10.3.193.202	10.3.193.203
116	10.3.193.204/30	10.3.193.205 – 10.3.193.206	10.3.193.207
117	10.3.193.208/30	10.3.193.209 – 10.3.193.210	10.3.193.211
118	10.3.193.212/30	10.3.193.213 – 10.3.193.214	10.3.193.215
119	10.3.193.216/30	10.3.193.217 – 10.3.193.218	10.3.193.219
120	10.3.193.220/30	10.3.193.221 – 10.3.193.222	10.3.193.223
121	10.3.193.224/30	10.3.193.225 – 10.3.193.226	10.3.193.227
122	10.3.193.228/30	10.3.193.229 – 10.3.193.230	10.3.193.231
123	10.3.193.232/30	10.3.193.233 – 10.3.193.234	10.3.193.235
124	10.3.193.236/30	10.3.193.237 – 10.3.193.238	10.3.193.239
125	10.3.193.240/30	10.3.193.241 – 10.3.193.242	10.3.193.243
126	10.3.193.244/30	10.3.193.245 – 10.3.193.246	10.3.193.247
127	10.3.193.248/30	10.3.193.249 – 10.3.193.250	10.3.193.251
128	10.3.193.252/30	10.3.193.253 – 10.3.193.254	10.3.193.255
129	10.3.194.0/30	10.3.194.1 – 10.3.194.2	10.3.194.3
130	10.3.194.4/30	10.3.194.5 – 10.3.194.6	10.3.194.7
131	10.3.194.8/30	10.3.194.9 – 10.3.194.10	10.3.194.11
132	10.3.194.12/30	10.3.194.13 – 10.3.194.14	10.3.194.15
133	10.3.194.16/30	10.3.194.17 – 10.3.194.18	10.3.194.19
134	10.3.194.20/30	10.3.194.21 – 10.3.194.22	10.3.194.23
135	10.3.194.24/30	10.3.194.25 – 10.3.194.26	10.3.194.27
136	10.3.194.28/30	10.3.194.29 – 10.3.194.30	10.3.194.31
137	10.3.194.32/30	10.3.194.33 – 10.3.194.34	10.3.194.35
138	10.3.194.36/30	10.3.194.37 – 10.3.194.38	10.3.194.39
139	10.3.194.40/30	10.3.194.41 – 10.3.194.42	10.3.194.43
140	10.3.194.44/30	10.3.194.45 – 10.3.194.46	10.3.194.47
141	10.3.194.48/30	10.3.194.49 – 10.3.194.50	10.3.194.51
142	10.3.194.52/30	10.3.194.53 – 10.3.194.54	10.3.194.55
143	10.3.194.56/30	10.3.194.57 – 10.3.194.58	10.3.194.59
144	10.3.194.60/30	10.3.194.61 – 10.3.194.62	10.3.194.63
145	10.3.194.64/30	10.3.194.65 – 10.3.194.66	10.3.194.67
146	10.3.194.68/30	10.3.194.69 – 10.3.194.70	10.3.194.71
147	10.3.194.72/30	10.3.194.73 – 10.3.194.74	10.3.194.75
148	10.3.194.76/30	10.3.194.77 – 10.3.194.78	10.3.194.79
149	10.3.194.80/30	10.3.194.81 – 10.3.194.82	10.3.194.83
150	10.3.194.84/30	10.3.194.85 – 10.3.194.86	10.3.194.87
151	10.3.194.88/30	10.3.194.89 – 10.3.194.90	10.3.194.91
152	10.3.194.92/30	10.3.194.93 – 10.3.194.94	10.3.194.95
153	10.3.194.96/30	10.3.194.97 – 10.3.194.98	10.3.194.99
154	10.3.194.100/30	10.3.194.101 – 10.3.194.102	10.3.194.103
155	10.3.194.104/30	10.3.194.105 – 10.3.194.106	10.3.194.107
156	10.3.194.108/30	10.3.194.109 – 10.3.194.110	10.3.194.111
157	10.3.194.112/30	10.3.194.113 – 10.3.194.114	10.3.194.115
158	10.3.194.116/30	10.3.194.117 – 10.3.194.118	10.3.194.119
159	10.3.194.120/30	10.3.194.121 – 10.3.194.122	10.3.194.123
160	10.3.194.124/30	10.3.194.125 – 10.3.194.126	10.3.194.127
161	10.3.194.128/30	10.3.194.129 – 10.3.194.130	10.3.194.131
162	10.3.194.132/30	10.3.194.133 – 10.3.194.134	10.3.194.135
163	10.3.194.136/30	10.3.194.137 – 10.3.194.138	10.3.194.139
164	10.3.194.140/30	10.3.194.141 – 10.3.194.142	10.3.194.143
165	10.3.194.144/30	10.3.194.145 – 10.3.194.146	10.3.194.147
166	10.3.194.148/30	10.3.194.149 – 10.3.194.150	10.3.194.151
167	10.3.194.152/30	10.3.194.153 – 10.3.194.154	10.3.194.155
168	10.3.194.156/30	10.3.194.157 – 10.3.194.158	10.3.194.159
169	10.3.194.160/30	10.3.194.161 – 10.3.194.162	10.3.194.163
170	10.3.194.164/30	10.3.194.165 – 10.3.194.166	10.3.194.167
171	10.3.194.168/30	10.3.194.169 – 10.3.194.170	10.3.194.171
172	10.3.194.172/30	10.3.194.173 – 10.3.194.174	10.3.194.175
173	10.3.194.176/30	10.3.194.177 – 10.3.194.178	10.3.194.179
174	10.3.194.180/30	10.3.194.181 – 10.3.194.182	10.3.194.183
175	10.3.194.184/30	10.3.194.185 – 10.3.194.186	10.3.194.187
176	10.3.194.188/30	10.3.194.189 – 10.3.194.190	10.3.194.191
177	10.3.194.192/30	10.3.194.193 – 10.3.194.194	10.3.194.195
178	10.3.194.196/30	10.3.194.197 – 10.3.194.198	10.3.194.199
179	10.3.194.200/30	10.3.194.201 – 10.3.194.202	10.3.194.203
180	10.3.194.204/30	10.3.194.205 – 10.3.194.206	10.3.194.207
181	10.3.194.208/30	10.3.194.209 – 10.3.194.210	10.3.194.211
182	10.3.194.212/30	10.3.194.213 – 10.3.194.214	10.3.194.215
183	10.3.194.216/30	10.3.194.217 – 10.3.194.218	10.3.194.219
184	10.3.194.220/30	10.3.194.221 – 10.3.194.222	10.3.194.223
185	10.3.194.224/30	10.3.194.225 – 10.3.194.226	10.3.194.227
186	10.3.194.228/30	10.3.194.229 – 10.3.194.230	10.3.194.231
187	10.3.194.232/30	10.3.194.233 – 10.3.194.234	10.3.194.235
188	10.3.194.236/30	10.3.194.237 – 10.3.194.238	10.3.194.239
189	10.3.194.240/30	10.3.194.241 – 10.3.194.242	10.3.194.243
190	10.3.194.244/30	10.3.194.245 – 10.3.194.246	10.3.194.247
191	10.3.194.248/30	10.3.194.249 – 10.3.194.250	10.3.194.251
192	10.3.194.252/30	10.3.194.253 – 10.3.194.254	10.3.194.255
193	10.3.195.0/30	10.3.195.1 – 10.3.195.2	10.3.195.3
194	10.3.195.4/30	10.3.195.5 – 10.3.195.6	10.3.195.7
195	10.3.195.8/30	10.3.195.9 – 10.3.195.10	10.3.195.11
196	10.3.195.12/30	10.3.195.13 – 10.3.195.14	10.3.195.15
197	10.3.195.16/30	10.3.195.17 – 10.3.195.18	10.3.195.19
198	10.3.195.20/30	10.3.195.21 – 10.3.195.22	10.3.195.23
199	10.3.195.24/30	10.3.195.25 – 10.3.195.26	10.3.195.27
200	10.3.195.28/30	10.3.195.29 – 10.3.195.30	10.3.195.31
201	10.3.195.32/30	10.3.195.33 – 10.3.195.34	10.3.195.35
202	10.3.195.36/30	10.3.195.37 – 10.3.195.38	10.3.195.39
203	10.3.195.40/30	10.3.195.41 – 10.3.195.42	10.3.195.43
204	10.3.195.44/30	10.3.195.45 – 10.3.195.46	10.3.195.47
205	10.3.195.48/30	10.3.195.49 – 10.3.195.50	10.3.195.51
206	10.3.195.52/30	10.3.195.53 – 10.3.195.54	10.3.195.55
207	10.3.195.56/30	10.3.195.57 – 10.3.195.58	10.3.195.59
208	10.3.195.60/30	10.3.195.61 – 10.3.195.62	10.3.195.63
209	10.3.195.64/30	10.3.195.65 – 10.3.195.66	10.3.195.67
210	10.3.195.68/30	10.3.195.69 – 10.3.195.70	10.3.195.71
211	10.3.195.72/30	10.3.195.73 – 10.3.195.74	10.3.195.75
212	10.3.195.76/30	10.3.195.77 – 10.3.195.78	10.3.195.79
213	10.3.195.80/30	10.3.195.81 – 10.3.195.82	10.3.195.83
214	10.3.195.84/30	10.3.195.85 – 10.3.195.86	10.3.195.87
215	10.3.195.88/30	10.3.195.89 – 10.3.195.90	10.3.195.91
216	10.3.195.92/30	10.3.195.93 – 10.3.195.94	10.3.195.95
217	10.3.195.96/30	10.3.195.97 – 10.3.195.98	10.3.195.99
218	10.3.195.100/30	10.3.195.101 – 10.3.195.102	10.3.195.103
219	10.3.195.104/30	10.3.195.105 – 10.3.195.106	10.3.195.107
220	10.3.195.108/30	10.3.195.109 – 10.3.195.110	10.3.195.111
221	10.3.195.112/30	10.3.195.113 – 10.3.195.114	10.3.195.115
222	10.3.195.116/30	10.3.195.117 – 10.3.195.118	10.3.195.119
223	10.3.195.120/30	10.3.195.121 – 10.3.195.122	10.3.195.123
224	10.3.195.124/30	10.3.195.125 – 10.3.195.126	10.3.195.127
225	10.3.195.128/30	10.3.195.129 – 10.3.195.130	10.3.195.131
226	10.3.195.132/30	10.3.195.133 – 10.3.195.134	10.3.195.135
227	10.3.195.136/30	10.3.195.137 – 10.3.195.138	10.3.195.139
228	10.3.195.140/30	10.3.195.141 – 10.3.195.142	10.3.195.143
229	10.3.195.144/30	10.3.195.145 – 10.3.195.146	10.3.195.147
230	10.3.195.148/30	10.3.195.149 – 10.3.195.150	10.3.195.151
231	10.3.195.152/30	10.3.195.153 – 10.3.195.154	10.3.195.155
232	10.3.195.156/30	10.3.195.157 – 10.3.195.158	10.3.195.159
233	10.3.195.160/30	10.3.195.161 – 10.3.195.162	10.3.195.163
234	10.3.195.164/30	10.3.195.165 – 10.3.195.166	10.3.195.167
235	10.3.195.168/30	10.3.195.169 – 10.3.195.170	10.3.195.171
236	10.3.195.172/30	10.3.195.173 – 10.3.195.174	10.3.195.175
237	10.3.195.176/30	10.3.195.177 – 10.3.195.178	10.3.195.179
238	10.3.195.180/30	10.3.195.181 – 10.3.195.182	10.3.195.183
239	10.3.195.184/30	10.3.195.185 – 10.3.195.186	10.3.195.187
240	10.3.195.188/30	10.3.195.189 – 10.3.195.190	10.3.195.191
241	10.3.195.192/30	10.3.195.193 – 10.3.195.194	10.3.195.195
242	10.3.195.196/30	10.3.195.197 – 10.3.195.198	10.3.195.199
243	10.3.195.200/30	10.3.195.201 – 10.3.195.202	10.3.195.203
244	10.3.195.204/30	10.3.195.205 – 10.3.195.206	10.3.195.207
245	10.3.195.208/30	10.3.195.209 – 10.3.195.210	10.3.195.211
246	10.3.195.212/30	10.3.195.213 – 10.3.195.214	10.3.195.215
247	10.3.195.216/30	10.3.195.217 – 10.3.195.218	10.3.195.219
248	10.3.195.220/30	10.3.195.221 – 10.3.195.222	10.3.195.223
249	10.3.195.224/30	10.3.195.225 – 10.3.195.226	10.3.195.227
250	10.3.195.228/30	10.3.195.229 – 10.3.195.230	10.3.195.231
251	10.3.195.232/30	10.3.195.233 – 10.3.195.234	10.3.195.235
252	10.3.195.236/30	10.3.195.237 – 10.3.195.238	10.3.195.239
253	10.3.195.240/30	10.3.195.241 – 10.3.195.242	10.3.195.243
254	10.3.195.244/30	10.3.195.245 – 10.3.195.246	10.3.195.247
255	10.3.195.248/30	10.3.195.249 – 10.3.195.250	10.3.195.251
256	10.3.195.252/30	10.3.195.253 – 10.3.195.254	10.3.195.255

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 →