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)10.3.80.0/21

network10.3.80.0/21

broadcast10.3.87.255

first host10.3.80.1

last host10.3.87.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.3.80.0/21

address00001010.00000011.01010000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000011.01010000.00000000

broadcast00001010.00000011.01010111.11111111

green = network part, grey = host part

hex0x0a035000

decimal167989248

reverse dns0.80.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:5000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.3.80.0/30	10.3.80.1 – 10.3.80.2	10.3.80.3
2	10.3.80.4/30	10.3.80.5 – 10.3.80.6	10.3.80.7
3	10.3.80.8/30	10.3.80.9 – 10.3.80.10	10.3.80.11
4	10.3.80.12/30	10.3.80.13 – 10.3.80.14	10.3.80.15
5	10.3.80.16/30	10.3.80.17 – 10.3.80.18	10.3.80.19
6	10.3.80.20/30	10.3.80.21 – 10.3.80.22	10.3.80.23
7	10.3.80.24/30	10.3.80.25 – 10.3.80.26	10.3.80.27
8	10.3.80.28/30	10.3.80.29 – 10.3.80.30	10.3.80.31
9	10.3.80.32/30	10.3.80.33 – 10.3.80.34	10.3.80.35
10	10.3.80.36/30	10.3.80.37 – 10.3.80.38	10.3.80.39
11	10.3.80.40/30	10.3.80.41 – 10.3.80.42	10.3.80.43
12	10.3.80.44/30	10.3.80.45 – 10.3.80.46	10.3.80.47
13	10.3.80.48/30	10.3.80.49 – 10.3.80.50	10.3.80.51
14	10.3.80.52/30	10.3.80.53 – 10.3.80.54	10.3.80.55
15	10.3.80.56/30	10.3.80.57 – 10.3.80.58	10.3.80.59
16	10.3.80.60/30	10.3.80.61 – 10.3.80.62	10.3.80.63
17	10.3.80.64/30	10.3.80.65 – 10.3.80.66	10.3.80.67
18	10.3.80.68/30	10.3.80.69 – 10.3.80.70	10.3.80.71
19	10.3.80.72/30	10.3.80.73 – 10.3.80.74	10.3.80.75
20	10.3.80.76/30	10.3.80.77 – 10.3.80.78	10.3.80.79
21	10.3.80.80/30	10.3.80.81 – 10.3.80.82	10.3.80.83
22	10.3.80.84/30	10.3.80.85 – 10.3.80.86	10.3.80.87
23	10.3.80.88/30	10.3.80.89 – 10.3.80.90	10.3.80.91
24	10.3.80.92/30	10.3.80.93 – 10.3.80.94	10.3.80.95
25	10.3.80.96/30	10.3.80.97 – 10.3.80.98	10.3.80.99
26	10.3.80.100/30	10.3.80.101 – 10.3.80.102	10.3.80.103
27	10.3.80.104/30	10.3.80.105 – 10.3.80.106	10.3.80.107
28	10.3.80.108/30	10.3.80.109 – 10.3.80.110	10.3.80.111
29	10.3.80.112/30	10.3.80.113 – 10.3.80.114	10.3.80.115
30	10.3.80.116/30	10.3.80.117 – 10.3.80.118	10.3.80.119
31	10.3.80.120/30	10.3.80.121 – 10.3.80.122	10.3.80.123
32	10.3.80.124/30	10.3.80.125 – 10.3.80.126	10.3.80.127
33	10.3.80.128/30	10.3.80.129 – 10.3.80.130	10.3.80.131
34	10.3.80.132/30	10.3.80.133 – 10.3.80.134	10.3.80.135
35	10.3.80.136/30	10.3.80.137 – 10.3.80.138	10.3.80.139
36	10.3.80.140/30	10.3.80.141 – 10.3.80.142	10.3.80.143
37	10.3.80.144/30	10.3.80.145 – 10.3.80.146	10.3.80.147
38	10.3.80.148/30	10.3.80.149 – 10.3.80.150	10.3.80.151
39	10.3.80.152/30	10.3.80.153 – 10.3.80.154	10.3.80.155
40	10.3.80.156/30	10.3.80.157 – 10.3.80.158	10.3.80.159
41	10.3.80.160/30	10.3.80.161 – 10.3.80.162	10.3.80.163
42	10.3.80.164/30	10.3.80.165 – 10.3.80.166	10.3.80.167
43	10.3.80.168/30	10.3.80.169 – 10.3.80.170	10.3.80.171
44	10.3.80.172/30	10.3.80.173 – 10.3.80.174	10.3.80.175
45	10.3.80.176/30	10.3.80.177 – 10.3.80.178	10.3.80.179
46	10.3.80.180/30	10.3.80.181 – 10.3.80.182	10.3.80.183
47	10.3.80.184/30	10.3.80.185 – 10.3.80.186	10.3.80.187
48	10.3.80.188/30	10.3.80.189 – 10.3.80.190	10.3.80.191
49	10.3.80.192/30	10.3.80.193 – 10.3.80.194	10.3.80.195
50	10.3.80.196/30	10.3.80.197 – 10.3.80.198	10.3.80.199
51	10.3.80.200/30	10.3.80.201 – 10.3.80.202	10.3.80.203
52	10.3.80.204/30	10.3.80.205 – 10.3.80.206	10.3.80.207
53	10.3.80.208/30	10.3.80.209 – 10.3.80.210	10.3.80.211
54	10.3.80.212/30	10.3.80.213 – 10.3.80.214	10.3.80.215
55	10.3.80.216/30	10.3.80.217 – 10.3.80.218	10.3.80.219
56	10.3.80.220/30	10.3.80.221 – 10.3.80.222	10.3.80.223
57	10.3.80.224/30	10.3.80.225 – 10.3.80.226	10.3.80.227
58	10.3.80.228/30	10.3.80.229 – 10.3.80.230	10.3.80.231
59	10.3.80.232/30	10.3.80.233 – 10.3.80.234	10.3.80.235
60	10.3.80.236/30	10.3.80.237 – 10.3.80.238	10.3.80.239
61	10.3.80.240/30	10.3.80.241 – 10.3.80.242	10.3.80.243
62	10.3.80.244/30	10.3.80.245 – 10.3.80.246	10.3.80.247
63	10.3.80.248/30	10.3.80.249 – 10.3.80.250	10.3.80.251
64	10.3.80.252/30	10.3.80.253 – 10.3.80.254	10.3.80.255
65	10.3.81.0/30	10.3.81.1 – 10.3.81.2	10.3.81.3
66	10.3.81.4/30	10.3.81.5 – 10.3.81.6	10.3.81.7
67	10.3.81.8/30	10.3.81.9 – 10.3.81.10	10.3.81.11
68	10.3.81.12/30	10.3.81.13 – 10.3.81.14	10.3.81.15
69	10.3.81.16/30	10.3.81.17 – 10.3.81.18	10.3.81.19
70	10.3.81.20/30	10.3.81.21 – 10.3.81.22	10.3.81.23
71	10.3.81.24/30	10.3.81.25 – 10.3.81.26	10.3.81.27
72	10.3.81.28/30	10.3.81.29 – 10.3.81.30	10.3.81.31
73	10.3.81.32/30	10.3.81.33 – 10.3.81.34	10.3.81.35
74	10.3.81.36/30	10.3.81.37 – 10.3.81.38	10.3.81.39
75	10.3.81.40/30	10.3.81.41 – 10.3.81.42	10.3.81.43
76	10.3.81.44/30	10.3.81.45 – 10.3.81.46	10.3.81.47
77	10.3.81.48/30	10.3.81.49 – 10.3.81.50	10.3.81.51
78	10.3.81.52/30	10.3.81.53 – 10.3.81.54	10.3.81.55
79	10.3.81.56/30	10.3.81.57 – 10.3.81.58	10.3.81.59
80	10.3.81.60/30	10.3.81.61 – 10.3.81.62	10.3.81.63
81	10.3.81.64/30	10.3.81.65 – 10.3.81.66	10.3.81.67
82	10.3.81.68/30	10.3.81.69 – 10.3.81.70	10.3.81.71
83	10.3.81.72/30	10.3.81.73 – 10.3.81.74	10.3.81.75
84	10.3.81.76/30	10.3.81.77 – 10.3.81.78	10.3.81.79
85	10.3.81.80/30	10.3.81.81 – 10.3.81.82	10.3.81.83
86	10.3.81.84/30	10.3.81.85 – 10.3.81.86	10.3.81.87
87	10.3.81.88/30	10.3.81.89 – 10.3.81.90	10.3.81.91
88	10.3.81.92/30	10.3.81.93 – 10.3.81.94	10.3.81.95
89	10.3.81.96/30	10.3.81.97 – 10.3.81.98	10.3.81.99
90	10.3.81.100/30	10.3.81.101 – 10.3.81.102	10.3.81.103
91	10.3.81.104/30	10.3.81.105 – 10.3.81.106	10.3.81.107
92	10.3.81.108/30	10.3.81.109 – 10.3.81.110	10.3.81.111
93	10.3.81.112/30	10.3.81.113 – 10.3.81.114	10.3.81.115
94	10.3.81.116/30	10.3.81.117 – 10.3.81.118	10.3.81.119
95	10.3.81.120/30	10.3.81.121 – 10.3.81.122	10.3.81.123
96	10.3.81.124/30	10.3.81.125 – 10.3.81.126	10.3.81.127
97	10.3.81.128/30	10.3.81.129 – 10.3.81.130	10.3.81.131
98	10.3.81.132/30	10.3.81.133 – 10.3.81.134	10.3.81.135
99	10.3.81.136/30	10.3.81.137 – 10.3.81.138	10.3.81.139
100	10.3.81.140/30	10.3.81.141 – 10.3.81.142	10.3.81.143
101	10.3.81.144/30	10.3.81.145 – 10.3.81.146	10.3.81.147
102	10.3.81.148/30	10.3.81.149 – 10.3.81.150	10.3.81.151
103	10.3.81.152/30	10.3.81.153 – 10.3.81.154	10.3.81.155
104	10.3.81.156/30	10.3.81.157 – 10.3.81.158	10.3.81.159
105	10.3.81.160/30	10.3.81.161 – 10.3.81.162	10.3.81.163
106	10.3.81.164/30	10.3.81.165 – 10.3.81.166	10.3.81.167
107	10.3.81.168/30	10.3.81.169 – 10.3.81.170	10.3.81.171
108	10.3.81.172/30	10.3.81.173 – 10.3.81.174	10.3.81.175
109	10.3.81.176/30	10.3.81.177 – 10.3.81.178	10.3.81.179
110	10.3.81.180/30	10.3.81.181 – 10.3.81.182	10.3.81.183
111	10.3.81.184/30	10.3.81.185 – 10.3.81.186	10.3.81.187
112	10.3.81.188/30	10.3.81.189 – 10.3.81.190	10.3.81.191
113	10.3.81.192/30	10.3.81.193 – 10.3.81.194	10.3.81.195
114	10.3.81.196/30	10.3.81.197 – 10.3.81.198	10.3.81.199
115	10.3.81.200/30	10.3.81.201 – 10.3.81.202	10.3.81.203
116	10.3.81.204/30	10.3.81.205 – 10.3.81.206	10.3.81.207
117	10.3.81.208/30	10.3.81.209 – 10.3.81.210	10.3.81.211
118	10.3.81.212/30	10.3.81.213 – 10.3.81.214	10.3.81.215
119	10.3.81.216/30	10.3.81.217 – 10.3.81.218	10.3.81.219
120	10.3.81.220/30	10.3.81.221 – 10.3.81.222	10.3.81.223
121	10.3.81.224/30	10.3.81.225 – 10.3.81.226	10.3.81.227
122	10.3.81.228/30	10.3.81.229 – 10.3.81.230	10.3.81.231
123	10.3.81.232/30	10.3.81.233 – 10.3.81.234	10.3.81.235
124	10.3.81.236/30	10.3.81.237 – 10.3.81.238	10.3.81.239
125	10.3.81.240/30	10.3.81.241 – 10.3.81.242	10.3.81.243
126	10.3.81.244/30	10.3.81.245 – 10.3.81.246	10.3.81.247
127	10.3.81.248/30	10.3.81.249 – 10.3.81.250	10.3.81.251
128	10.3.81.252/30	10.3.81.253 – 10.3.81.254	10.3.81.255
129	10.3.82.0/30	10.3.82.1 – 10.3.82.2	10.3.82.3
130	10.3.82.4/30	10.3.82.5 – 10.3.82.6	10.3.82.7
131	10.3.82.8/30	10.3.82.9 – 10.3.82.10	10.3.82.11
132	10.3.82.12/30	10.3.82.13 – 10.3.82.14	10.3.82.15
133	10.3.82.16/30	10.3.82.17 – 10.3.82.18	10.3.82.19
134	10.3.82.20/30	10.3.82.21 – 10.3.82.22	10.3.82.23
135	10.3.82.24/30	10.3.82.25 – 10.3.82.26	10.3.82.27
136	10.3.82.28/30	10.3.82.29 – 10.3.82.30	10.3.82.31
137	10.3.82.32/30	10.3.82.33 – 10.3.82.34	10.3.82.35
138	10.3.82.36/30	10.3.82.37 – 10.3.82.38	10.3.82.39
139	10.3.82.40/30	10.3.82.41 – 10.3.82.42	10.3.82.43
140	10.3.82.44/30	10.3.82.45 – 10.3.82.46	10.3.82.47
141	10.3.82.48/30	10.3.82.49 – 10.3.82.50	10.3.82.51
142	10.3.82.52/30	10.3.82.53 – 10.3.82.54	10.3.82.55
143	10.3.82.56/30	10.3.82.57 – 10.3.82.58	10.3.82.59
144	10.3.82.60/30	10.3.82.61 – 10.3.82.62	10.3.82.63
145	10.3.82.64/30	10.3.82.65 – 10.3.82.66	10.3.82.67
146	10.3.82.68/30	10.3.82.69 – 10.3.82.70	10.3.82.71
147	10.3.82.72/30	10.3.82.73 – 10.3.82.74	10.3.82.75
148	10.3.82.76/30	10.3.82.77 – 10.3.82.78	10.3.82.79
149	10.3.82.80/30	10.3.82.81 – 10.3.82.82	10.3.82.83
150	10.3.82.84/30	10.3.82.85 – 10.3.82.86	10.3.82.87
151	10.3.82.88/30	10.3.82.89 – 10.3.82.90	10.3.82.91
152	10.3.82.92/30	10.3.82.93 – 10.3.82.94	10.3.82.95
153	10.3.82.96/30	10.3.82.97 – 10.3.82.98	10.3.82.99
154	10.3.82.100/30	10.3.82.101 – 10.3.82.102	10.3.82.103
155	10.3.82.104/30	10.3.82.105 – 10.3.82.106	10.3.82.107
156	10.3.82.108/30	10.3.82.109 – 10.3.82.110	10.3.82.111
157	10.3.82.112/30	10.3.82.113 – 10.3.82.114	10.3.82.115
158	10.3.82.116/30	10.3.82.117 – 10.3.82.118	10.3.82.119
159	10.3.82.120/30	10.3.82.121 – 10.3.82.122	10.3.82.123
160	10.3.82.124/30	10.3.82.125 – 10.3.82.126	10.3.82.127
161	10.3.82.128/30	10.3.82.129 – 10.3.82.130	10.3.82.131
162	10.3.82.132/30	10.3.82.133 – 10.3.82.134	10.3.82.135
163	10.3.82.136/30	10.3.82.137 – 10.3.82.138	10.3.82.139
164	10.3.82.140/30	10.3.82.141 – 10.3.82.142	10.3.82.143
165	10.3.82.144/30	10.3.82.145 – 10.3.82.146	10.3.82.147
166	10.3.82.148/30	10.3.82.149 – 10.3.82.150	10.3.82.151
167	10.3.82.152/30	10.3.82.153 – 10.3.82.154	10.3.82.155
168	10.3.82.156/30	10.3.82.157 – 10.3.82.158	10.3.82.159
169	10.3.82.160/30	10.3.82.161 – 10.3.82.162	10.3.82.163
170	10.3.82.164/30	10.3.82.165 – 10.3.82.166	10.3.82.167
171	10.3.82.168/30	10.3.82.169 – 10.3.82.170	10.3.82.171
172	10.3.82.172/30	10.3.82.173 – 10.3.82.174	10.3.82.175
173	10.3.82.176/30	10.3.82.177 – 10.3.82.178	10.3.82.179
174	10.3.82.180/30	10.3.82.181 – 10.3.82.182	10.3.82.183
175	10.3.82.184/30	10.3.82.185 – 10.3.82.186	10.3.82.187
176	10.3.82.188/30	10.3.82.189 – 10.3.82.190	10.3.82.191
177	10.3.82.192/30	10.3.82.193 – 10.3.82.194	10.3.82.195
178	10.3.82.196/30	10.3.82.197 – 10.3.82.198	10.3.82.199
179	10.3.82.200/30	10.3.82.201 – 10.3.82.202	10.3.82.203
180	10.3.82.204/30	10.3.82.205 – 10.3.82.206	10.3.82.207
181	10.3.82.208/30	10.3.82.209 – 10.3.82.210	10.3.82.211
182	10.3.82.212/30	10.3.82.213 – 10.3.82.214	10.3.82.215
183	10.3.82.216/30	10.3.82.217 – 10.3.82.218	10.3.82.219
184	10.3.82.220/30	10.3.82.221 – 10.3.82.222	10.3.82.223
185	10.3.82.224/30	10.3.82.225 – 10.3.82.226	10.3.82.227
186	10.3.82.228/30	10.3.82.229 – 10.3.82.230	10.3.82.231
187	10.3.82.232/30	10.3.82.233 – 10.3.82.234	10.3.82.235
188	10.3.82.236/30	10.3.82.237 – 10.3.82.238	10.3.82.239
189	10.3.82.240/30	10.3.82.241 – 10.3.82.242	10.3.82.243
190	10.3.82.244/30	10.3.82.245 – 10.3.82.246	10.3.82.247
191	10.3.82.248/30	10.3.82.249 – 10.3.82.250	10.3.82.251
192	10.3.82.252/30	10.3.82.253 – 10.3.82.254	10.3.82.255
193	10.3.83.0/30	10.3.83.1 – 10.3.83.2	10.3.83.3
194	10.3.83.4/30	10.3.83.5 – 10.3.83.6	10.3.83.7
195	10.3.83.8/30	10.3.83.9 – 10.3.83.10	10.3.83.11
196	10.3.83.12/30	10.3.83.13 – 10.3.83.14	10.3.83.15
197	10.3.83.16/30	10.3.83.17 – 10.3.83.18	10.3.83.19
198	10.3.83.20/30	10.3.83.21 – 10.3.83.22	10.3.83.23
199	10.3.83.24/30	10.3.83.25 – 10.3.83.26	10.3.83.27
200	10.3.83.28/30	10.3.83.29 – 10.3.83.30	10.3.83.31
201	10.3.83.32/30	10.3.83.33 – 10.3.83.34	10.3.83.35
202	10.3.83.36/30	10.3.83.37 – 10.3.83.38	10.3.83.39
203	10.3.83.40/30	10.3.83.41 – 10.3.83.42	10.3.83.43
204	10.3.83.44/30	10.3.83.45 – 10.3.83.46	10.3.83.47
205	10.3.83.48/30	10.3.83.49 – 10.3.83.50	10.3.83.51
206	10.3.83.52/30	10.3.83.53 – 10.3.83.54	10.3.83.55
207	10.3.83.56/30	10.3.83.57 – 10.3.83.58	10.3.83.59
208	10.3.83.60/30	10.3.83.61 – 10.3.83.62	10.3.83.63
209	10.3.83.64/30	10.3.83.65 – 10.3.83.66	10.3.83.67
210	10.3.83.68/30	10.3.83.69 – 10.3.83.70	10.3.83.71
211	10.3.83.72/30	10.3.83.73 – 10.3.83.74	10.3.83.75
212	10.3.83.76/30	10.3.83.77 – 10.3.83.78	10.3.83.79
213	10.3.83.80/30	10.3.83.81 – 10.3.83.82	10.3.83.83
214	10.3.83.84/30	10.3.83.85 – 10.3.83.86	10.3.83.87
215	10.3.83.88/30	10.3.83.89 – 10.3.83.90	10.3.83.91
216	10.3.83.92/30	10.3.83.93 – 10.3.83.94	10.3.83.95
217	10.3.83.96/30	10.3.83.97 – 10.3.83.98	10.3.83.99
218	10.3.83.100/30	10.3.83.101 – 10.3.83.102	10.3.83.103
219	10.3.83.104/30	10.3.83.105 – 10.3.83.106	10.3.83.107
220	10.3.83.108/30	10.3.83.109 – 10.3.83.110	10.3.83.111
221	10.3.83.112/30	10.3.83.113 – 10.3.83.114	10.3.83.115
222	10.3.83.116/30	10.3.83.117 – 10.3.83.118	10.3.83.119
223	10.3.83.120/30	10.3.83.121 – 10.3.83.122	10.3.83.123
224	10.3.83.124/30	10.3.83.125 – 10.3.83.126	10.3.83.127
225	10.3.83.128/30	10.3.83.129 – 10.3.83.130	10.3.83.131
226	10.3.83.132/30	10.3.83.133 – 10.3.83.134	10.3.83.135
227	10.3.83.136/30	10.3.83.137 – 10.3.83.138	10.3.83.139
228	10.3.83.140/30	10.3.83.141 – 10.3.83.142	10.3.83.143
229	10.3.83.144/30	10.3.83.145 – 10.3.83.146	10.3.83.147
230	10.3.83.148/30	10.3.83.149 – 10.3.83.150	10.3.83.151
231	10.3.83.152/30	10.3.83.153 – 10.3.83.154	10.3.83.155
232	10.3.83.156/30	10.3.83.157 – 10.3.83.158	10.3.83.159
233	10.3.83.160/30	10.3.83.161 – 10.3.83.162	10.3.83.163
234	10.3.83.164/30	10.3.83.165 – 10.3.83.166	10.3.83.167
235	10.3.83.168/30	10.3.83.169 – 10.3.83.170	10.3.83.171
236	10.3.83.172/30	10.3.83.173 – 10.3.83.174	10.3.83.175
237	10.3.83.176/30	10.3.83.177 – 10.3.83.178	10.3.83.179
238	10.3.83.180/30	10.3.83.181 – 10.3.83.182	10.3.83.183
239	10.3.83.184/30	10.3.83.185 – 10.3.83.186	10.3.83.187
240	10.3.83.188/30	10.3.83.189 – 10.3.83.190	10.3.83.191
241	10.3.83.192/30	10.3.83.193 – 10.3.83.194	10.3.83.195
242	10.3.83.196/30	10.3.83.197 – 10.3.83.198	10.3.83.199
243	10.3.83.200/30	10.3.83.201 – 10.3.83.202	10.3.83.203
244	10.3.83.204/30	10.3.83.205 – 10.3.83.206	10.3.83.207
245	10.3.83.208/30	10.3.83.209 – 10.3.83.210	10.3.83.211
246	10.3.83.212/30	10.3.83.213 – 10.3.83.214	10.3.83.215
247	10.3.83.216/30	10.3.83.217 – 10.3.83.218	10.3.83.219
248	10.3.83.220/30	10.3.83.221 – 10.3.83.222	10.3.83.223
249	10.3.83.224/30	10.3.83.225 – 10.3.83.226	10.3.83.227
250	10.3.83.228/30	10.3.83.229 – 10.3.83.230	10.3.83.231
251	10.3.83.232/30	10.3.83.233 – 10.3.83.234	10.3.83.235
252	10.3.83.236/30	10.3.83.237 – 10.3.83.238	10.3.83.239
253	10.3.83.240/30	10.3.83.241 – 10.3.83.242	10.3.83.243
254	10.3.83.244/30	10.3.83.245 – 10.3.83.246	10.3.83.247
255	10.3.83.248/30	10.3.83.249 – 10.3.83.250	10.3.83.251
256	10.3.83.252/30	10.3.83.253 – 10.3.83.254	10.3.83.255

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 →