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)10.0.104.0/21

network10.0.104.0/21

broadcast10.0.111.255

first host10.0.104.1

last host10.0.111.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.0.104.0/21

address00001010.00000000.01101000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000000.01101000.00000000

broadcast00001010.00000000.01101111.11111111

green = network part, grey = host part

hex0x0a006800

decimal167798784

reverse dns0.104.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.0.104.0/30	10.0.104.1 – 10.0.104.2	10.0.104.3
2	10.0.104.4/30	10.0.104.5 – 10.0.104.6	10.0.104.7
3	10.0.104.8/30	10.0.104.9 – 10.0.104.10	10.0.104.11
4	10.0.104.12/30	10.0.104.13 – 10.0.104.14	10.0.104.15
5	10.0.104.16/30	10.0.104.17 – 10.0.104.18	10.0.104.19
6	10.0.104.20/30	10.0.104.21 – 10.0.104.22	10.0.104.23
7	10.0.104.24/30	10.0.104.25 – 10.0.104.26	10.0.104.27
8	10.0.104.28/30	10.0.104.29 – 10.0.104.30	10.0.104.31
9	10.0.104.32/30	10.0.104.33 – 10.0.104.34	10.0.104.35
10	10.0.104.36/30	10.0.104.37 – 10.0.104.38	10.0.104.39
11	10.0.104.40/30	10.0.104.41 – 10.0.104.42	10.0.104.43
12	10.0.104.44/30	10.0.104.45 – 10.0.104.46	10.0.104.47
13	10.0.104.48/30	10.0.104.49 – 10.0.104.50	10.0.104.51
14	10.0.104.52/30	10.0.104.53 – 10.0.104.54	10.0.104.55
15	10.0.104.56/30	10.0.104.57 – 10.0.104.58	10.0.104.59
16	10.0.104.60/30	10.0.104.61 – 10.0.104.62	10.0.104.63
17	10.0.104.64/30	10.0.104.65 – 10.0.104.66	10.0.104.67
18	10.0.104.68/30	10.0.104.69 – 10.0.104.70	10.0.104.71
19	10.0.104.72/30	10.0.104.73 – 10.0.104.74	10.0.104.75
20	10.0.104.76/30	10.0.104.77 – 10.0.104.78	10.0.104.79
21	10.0.104.80/30	10.0.104.81 – 10.0.104.82	10.0.104.83
22	10.0.104.84/30	10.0.104.85 – 10.0.104.86	10.0.104.87
23	10.0.104.88/30	10.0.104.89 – 10.0.104.90	10.0.104.91
24	10.0.104.92/30	10.0.104.93 – 10.0.104.94	10.0.104.95
25	10.0.104.96/30	10.0.104.97 – 10.0.104.98	10.0.104.99
26	10.0.104.100/30	10.0.104.101 – 10.0.104.102	10.0.104.103
27	10.0.104.104/30	10.0.104.105 – 10.0.104.106	10.0.104.107
28	10.0.104.108/30	10.0.104.109 – 10.0.104.110	10.0.104.111
29	10.0.104.112/30	10.0.104.113 – 10.0.104.114	10.0.104.115
30	10.0.104.116/30	10.0.104.117 – 10.0.104.118	10.0.104.119
31	10.0.104.120/30	10.0.104.121 – 10.0.104.122	10.0.104.123
32	10.0.104.124/30	10.0.104.125 – 10.0.104.126	10.0.104.127
33	10.0.104.128/30	10.0.104.129 – 10.0.104.130	10.0.104.131
34	10.0.104.132/30	10.0.104.133 – 10.0.104.134	10.0.104.135
35	10.0.104.136/30	10.0.104.137 – 10.0.104.138	10.0.104.139
36	10.0.104.140/30	10.0.104.141 – 10.0.104.142	10.0.104.143
37	10.0.104.144/30	10.0.104.145 – 10.0.104.146	10.0.104.147
38	10.0.104.148/30	10.0.104.149 – 10.0.104.150	10.0.104.151
39	10.0.104.152/30	10.0.104.153 – 10.0.104.154	10.0.104.155
40	10.0.104.156/30	10.0.104.157 – 10.0.104.158	10.0.104.159
41	10.0.104.160/30	10.0.104.161 – 10.0.104.162	10.0.104.163
42	10.0.104.164/30	10.0.104.165 – 10.0.104.166	10.0.104.167
43	10.0.104.168/30	10.0.104.169 – 10.0.104.170	10.0.104.171
44	10.0.104.172/30	10.0.104.173 – 10.0.104.174	10.0.104.175
45	10.0.104.176/30	10.0.104.177 – 10.0.104.178	10.0.104.179
46	10.0.104.180/30	10.0.104.181 – 10.0.104.182	10.0.104.183
47	10.0.104.184/30	10.0.104.185 – 10.0.104.186	10.0.104.187
48	10.0.104.188/30	10.0.104.189 – 10.0.104.190	10.0.104.191
49	10.0.104.192/30	10.0.104.193 – 10.0.104.194	10.0.104.195
50	10.0.104.196/30	10.0.104.197 – 10.0.104.198	10.0.104.199
51	10.0.104.200/30	10.0.104.201 – 10.0.104.202	10.0.104.203
52	10.0.104.204/30	10.0.104.205 – 10.0.104.206	10.0.104.207
53	10.0.104.208/30	10.0.104.209 – 10.0.104.210	10.0.104.211
54	10.0.104.212/30	10.0.104.213 – 10.0.104.214	10.0.104.215
55	10.0.104.216/30	10.0.104.217 – 10.0.104.218	10.0.104.219
56	10.0.104.220/30	10.0.104.221 – 10.0.104.222	10.0.104.223
57	10.0.104.224/30	10.0.104.225 – 10.0.104.226	10.0.104.227
58	10.0.104.228/30	10.0.104.229 – 10.0.104.230	10.0.104.231
59	10.0.104.232/30	10.0.104.233 – 10.0.104.234	10.0.104.235
60	10.0.104.236/30	10.0.104.237 – 10.0.104.238	10.0.104.239
61	10.0.104.240/30	10.0.104.241 – 10.0.104.242	10.0.104.243
62	10.0.104.244/30	10.0.104.245 – 10.0.104.246	10.0.104.247
63	10.0.104.248/30	10.0.104.249 – 10.0.104.250	10.0.104.251
64	10.0.104.252/30	10.0.104.253 – 10.0.104.254	10.0.104.255
65	10.0.105.0/30	10.0.105.1 – 10.0.105.2	10.0.105.3
66	10.0.105.4/30	10.0.105.5 – 10.0.105.6	10.0.105.7
67	10.0.105.8/30	10.0.105.9 – 10.0.105.10	10.0.105.11
68	10.0.105.12/30	10.0.105.13 – 10.0.105.14	10.0.105.15
69	10.0.105.16/30	10.0.105.17 – 10.0.105.18	10.0.105.19
70	10.0.105.20/30	10.0.105.21 – 10.0.105.22	10.0.105.23
71	10.0.105.24/30	10.0.105.25 – 10.0.105.26	10.0.105.27
72	10.0.105.28/30	10.0.105.29 – 10.0.105.30	10.0.105.31
73	10.0.105.32/30	10.0.105.33 – 10.0.105.34	10.0.105.35
74	10.0.105.36/30	10.0.105.37 – 10.0.105.38	10.0.105.39
75	10.0.105.40/30	10.0.105.41 – 10.0.105.42	10.0.105.43
76	10.0.105.44/30	10.0.105.45 – 10.0.105.46	10.0.105.47
77	10.0.105.48/30	10.0.105.49 – 10.0.105.50	10.0.105.51
78	10.0.105.52/30	10.0.105.53 – 10.0.105.54	10.0.105.55
79	10.0.105.56/30	10.0.105.57 – 10.0.105.58	10.0.105.59
80	10.0.105.60/30	10.0.105.61 – 10.0.105.62	10.0.105.63
81	10.0.105.64/30	10.0.105.65 – 10.0.105.66	10.0.105.67
82	10.0.105.68/30	10.0.105.69 – 10.0.105.70	10.0.105.71
83	10.0.105.72/30	10.0.105.73 – 10.0.105.74	10.0.105.75
84	10.0.105.76/30	10.0.105.77 – 10.0.105.78	10.0.105.79
85	10.0.105.80/30	10.0.105.81 – 10.0.105.82	10.0.105.83
86	10.0.105.84/30	10.0.105.85 – 10.0.105.86	10.0.105.87
87	10.0.105.88/30	10.0.105.89 – 10.0.105.90	10.0.105.91
88	10.0.105.92/30	10.0.105.93 – 10.0.105.94	10.0.105.95
89	10.0.105.96/30	10.0.105.97 – 10.0.105.98	10.0.105.99
90	10.0.105.100/30	10.0.105.101 – 10.0.105.102	10.0.105.103
91	10.0.105.104/30	10.0.105.105 – 10.0.105.106	10.0.105.107
92	10.0.105.108/30	10.0.105.109 – 10.0.105.110	10.0.105.111
93	10.0.105.112/30	10.0.105.113 – 10.0.105.114	10.0.105.115
94	10.0.105.116/30	10.0.105.117 – 10.0.105.118	10.0.105.119
95	10.0.105.120/30	10.0.105.121 – 10.0.105.122	10.0.105.123
96	10.0.105.124/30	10.0.105.125 – 10.0.105.126	10.0.105.127
97	10.0.105.128/30	10.0.105.129 – 10.0.105.130	10.0.105.131
98	10.0.105.132/30	10.0.105.133 – 10.0.105.134	10.0.105.135
99	10.0.105.136/30	10.0.105.137 – 10.0.105.138	10.0.105.139
100	10.0.105.140/30	10.0.105.141 – 10.0.105.142	10.0.105.143
101	10.0.105.144/30	10.0.105.145 – 10.0.105.146	10.0.105.147
102	10.0.105.148/30	10.0.105.149 – 10.0.105.150	10.0.105.151
103	10.0.105.152/30	10.0.105.153 – 10.0.105.154	10.0.105.155
104	10.0.105.156/30	10.0.105.157 – 10.0.105.158	10.0.105.159
105	10.0.105.160/30	10.0.105.161 – 10.0.105.162	10.0.105.163
106	10.0.105.164/30	10.0.105.165 – 10.0.105.166	10.0.105.167
107	10.0.105.168/30	10.0.105.169 – 10.0.105.170	10.0.105.171
108	10.0.105.172/30	10.0.105.173 – 10.0.105.174	10.0.105.175
109	10.0.105.176/30	10.0.105.177 – 10.0.105.178	10.0.105.179
110	10.0.105.180/30	10.0.105.181 – 10.0.105.182	10.0.105.183
111	10.0.105.184/30	10.0.105.185 – 10.0.105.186	10.0.105.187
112	10.0.105.188/30	10.0.105.189 – 10.0.105.190	10.0.105.191
113	10.0.105.192/30	10.0.105.193 – 10.0.105.194	10.0.105.195
114	10.0.105.196/30	10.0.105.197 – 10.0.105.198	10.0.105.199
115	10.0.105.200/30	10.0.105.201 – 10.0.105.202	10.0.105.203
116	10.0.105.204/30	10.0.105.205 – 10.0.105.206	10.0.105.207
117	10.0.105.208/30	10.0.105.209 – 10.0.105.210	10.0.105.211
118	10.0.105.212/30	10.0.105.213 – 10.0.105.214	10.0.105.215
119	10.0.105.216/30	10.0.105.217 – 10.0.105.218	10.0.105.219
120	10.0.105.220/30	10.0.105.221 – 10.0.105.222	10.0.105.223
121	10.0.105.224/30	10.0.105.225 – 10.0.105.226	10.0.105.227
122	10.0.105.228/30	10.0.105.229 – 10.0.105.230	10.0.105.231
123	10.0.105.232/30	10.0.105.233 – 10.0.105.234	10.0.105.235
124	10.0.105.236/30	10.0.105.237 – 10.0.105.238	10.0.105.239
125	10.0.105.240/30	10.0.105.241 – 10.0.105.242	10.0.105.243
126	10.0.105.244/30	10.0.105.245 – 10.0.105.246	10.0.105.247
127	10.0.105.248/30	10.0.105.249 – 10.0.105.250	10.0.105.251
128	10.0.105.252/30	10.0.105.253 – 10.0.105.254	10.0.105.255
129	10.0.106.0/30	10.0.106.1 – 10.0.106.2	10.0.106.3
130	10.0.106.4/30	10.0.106.5 – 10.0.106.6	10.0.106.7
131	10.0.106.8/30	10.0.106.9 – 10.0.106.10	10.0.106.11
132	10.0.106.12/30	10.0.106.13 – 10.0.106.14	10.0.106.15
133	10.0.106.16/30	10.0.106.17 – 10.0.106.18	10.0.106.19
134	10.0.106.20/30	10.0.106.21 – 10.0.106.22	10.0.106.23
135	10.0.106.24/30	10.0.106.25 – 10.0.106.26	10.0.106.27
136	10.0.106.28/30	10.0.106.29 – 10.0.106.30	10.0.106.31
137	10.0.106.32/30	10.0.106.33 – 10.0.106.34	10.0.106.35
138	10.0.106.36/30	10.0.106.37 – 10.0.106.38	10.0.106.39
139	10.0.106.40/30	10.0.106.41 – 10.0.106.42	10.0.106.43
140	10.0.106.44/30	10.0.106.45 – 10.0.106.46	10.0.106.47
141	10.0.106.48/30	10.0.106.49 – 10.0.106.50	10.0.106.51
142	10.0.106.52/30	10.0.106.53 – 10.0.106.54	10.0.106.55
143	10.0.106.56/30	10.0.106.57 – 10.0.106.58	10.0.106.59
144	10.0.106.60/30	10.0.106.61 – 10.0.106.62	10.0.106.63
145	10.0.106.64/30	10.0.106.65 – 10.0.106.66	10.0.106.67
146	10.0.106.68/30	10.0.106.69 – 10.0.106.70	10.0.106.71
147	10.0.106.72/30	10.0.106.73 – 10.0.106.74	10.0.106.75
148	10.0.106.76/30	10.0.106.77 – 10.0.106.78	10.0.106.79
149	10.0.106.80/30	10.0.106.81 – 10.0.106.82	10.0.106.83
150	10.0.106.84/30	10.0.106.85 – 10.0.106.86	10.0.106.87
151	10.0.106.88/30	10.0.106.89 – 10.0.106.90	10.0.106.91
152	10.0.106.92/30	10.0.106.93 – 10.0.106.94	10.0.106.95
153	10.0.106.96/30	10.0.106.97 – 10.0.106.98	10.0.106.99
154	10.0.106.100/30	10.0.106.101 – 10.0.106.102	10.0.106.103
155	10.0.106.104/30	10.0.106.105 – 10.0.106.106	10.0.106.107
156	10.0.106.108/30	10.0.106.109 – 10.0.106.110	10.0.106.111
157	10.0.106.112/30	10.0.106.113 – 10.0.106.114	10.0.106.115
158	10.0.106.116/30	10.0.106.117 – 10.0.106.118	10.0.106.119
159	10.0.106.120/30	10.0.106.121 – 10.0.106.122	10.0.106.123
160	10.0.106.124/30	10.0.106.125 – 10.0.106.126	10.0.106.127
161	10.0.106.128/30	10.0.106.129 – 10.0.106.130	10.0.106.131
162	10.0.106.132/30	10.0.106.133 – 10.0.106.134	10.0.106.135
163	10.0.106.136/30	10.0.106.137 – 10.0.106.138	10.0.106.139
164	10.0.106.140/30	10.0.106.141 – 10.0.106.142	10.0.106.143
165	10.0.106.144/30	10.0.106.145 – 10.0.106.146	10.0.106.147
166	10.0.106.148/30	10.0.106.149 – 10.0.106.150	10.0.106.151
167	10.0.106.152/30	10.0.106.153 – 10.0.106.154	10.0.106.155
168	10.0.106.156/30	10.0.106.157 – 10.0.106.158	10.0.106.159
169	10.0.106.160/30	10.0.106.161 – 10.0.106.162	10.0.106.163
170	10.0.106.164/30	10.0.106.165 – 10.0.106.166	10.0.106.167
171	10.0.106.168/30	10.0.106.169 – 10.0.106.170	10.0.106.171
172	10.0.106.172/30	10.0.106.173 – 10.0.106.174	10.0.106.175
173	10.0.106.176/30	10.0.106.177 – 10.0.106.178	10.0.106.179
174	10.0.106.180/30	10.0.106.181 – 10.0.106.182	10.0.106.183
175	10.0.106.184/30	10.0.106.185 – 10.0.106.186	10.0.106.187
176	10.0.106.188/30	10.0.106.189 – 10.0.106.190	10.0.106.191
177	10.0.106.192/30	10.0.106.193 – 10.0.106.194	10.0.106.195
178	10.0.106.196/30	10.0.106.197 – 10.0.106.198	10.0.106.199
179	10.0.106.200/30	10.0.106.201 – 10.0.106.202	10.0.106.203
180	10.0.106.204/30	10.0.106.205 – 10.0.106.206	10.0.106.207
181	10.0.106.208/30	10.0.106.209 – 10.0.106.210	10.0.106.211
182	10.0.106.212/30	10.0.106.213 – 10.0.106.214	10.0.106.215
183	10.0.106.216/30	10.0.106.217 – 10.0.106.218	10.0.106.219
184	10.0.106.220/30	10.0.106.221 – 10.0.106.222	10.0.106.223
185	10.0.106.224/30	10.0.106.225 – 10.0.106.226	10.0.106.227
186	10.0.106.228/30	10.0.106.229 – 10.0.106.230	10.0.106.231
187	10.0.106.232/30	10.0.106.233 – 10.0.106.234	10.0.106.235
188	10.0.106.236/30	10.0.106.237 – 10.0.106.238	10.0.106.239
189	10.0.106.240/30	10.0.106.241 – 10.0.106.242	10.0.106.243
190	10.0.106.244/30	10.0.106.245 – 10.0.106.246	10.0.106.247
191	10.0.106.248/30	10.0.106.249 – 10.0.106.250	10.0.106.251
192	10.0.106.252/30	10.0.106.253 – 10.0.106.254	10.0.106.255
193	10.0.107.0/30	10.0.107.1 – 10.0.107.2	10.0.107.3
194	10.0.107.4/30	10.0.107.5 – 10.0.107.6	10.0.107.7
195	10.0.107.8/30	10.0.107.9 – 10.0.107.10	10.0.107.11
196	10.0.107.12/30	10.0.107.13 – 10.0.107.14	10.0.107.15
197	10.0.107.16/30	10.0.107.17 – 10.0.107.18	10.0.107.19
198	10.0.107.20/30	10.0.107.21 – 10.0.107.22	10.0.107.23
199	10.0.107.24/30	10.0.107.25 – 10.0.107.26	10.0.107.27
200	10.0.107.28/30	10.0.107.29 – 10.0.107.30	10.0.107.31
201	10.0.107.32/30	10.0.107.33 – 10.0.107.34	10.0.107.35
202	10.0.107.36/30	10.0.107.37 – 10.0.107.38	10.0.107.39
203	10.0.107.40/30	10.0.107.41 – 10.0.107.42	10.0.107.43
204	10.0.107.44/30	10.0.107.45 – 10.0.107.46	10.0.107.47
205	10.0.107.48/30	10.0.107.49 – 10.0.107.50	10.0.107.51
206	10.0.107.52/30	10.0.107.53 – 10.0.107.54	10.0.107.55
207	10.0.107.56/30	10.0.107.57 – 10.0.107.58	10.0.107.59
208	10.0.107.60/30	10.0.107.61 – 10.0.107.62	10.0.107.63
209	10.0.107.64/30	10.0.107.65 – 10.0.107.66	10.0.107.67
210	10.0.107.68/30	10.0.107.69 – 10.0.107.70	10.0.107.71
211	10.0.107.72/30	10.0.107.73 – 10.0.107.74	10.0.107.75
212	10.0.107.76/30	10.0.107.77 – 10.0.107.78	10.0.107.79
213	10.0.107.80/30	10.0.107.81 – 10.0.107.82	10.0.107.83
214	10.0.107.84/30	10.0.107.85 – 10.0.107.86	10.0.107.87
215	10.0.107.88/30	10.0.107.89 – 10.0.107.90	10.0.107.91
216	10.0.107.92/30	10.0.107.93 – 10.0.107.94	10.0.107.95
217	10.0.107.96/30	10.0.107.97 – 10.0.107.98	10.0.107.99
218	10.0.107.100/30	10.0.107.101 – 10.0.107.102	10.0.107.103
219	10.0.107.104/30	10.0.107.105 – 10.0.107.106	10.0.107.107
220	10.0.107.108/30	10.0.107.109 – 10.0.107.110	10.0.107.111
221	10.0.107.112/30	10.0.107.113 – 10.0.107.114	10.0.107.115
222	10.0.107.116/30	10.0.107.117 – 10.0.107.118	10.0.107.119
223	10.0.107.120/30	10.0.107.121 – 10.0.107.122	10.0.107.123
224	10.0.107.124/30	10.0.107.125 – 10.0.107.126	10.0.107.127
225	10.0.107.128/30	10.0.107.129 – 10.0.107.130	10.0.107.131
226	10.0.107.132/30	10.0.107.133 – 10.0.107.134	10.0.107.135
227	10.0.107.136/30	10.0.107.137 – 10.0.107.138	10.0.107.139
228	10.0.107.140/30	10.0.107.141 – 10.0.107.142	10.0.107.143
229	10.0.107.144/30	10.0.107.145 – 10.0.107.146	10.0.107.147
230	10.0.107.148/30	10.0.107.149 – 10.0.107.150	10.0.107.151
231	10.0.107.152/30	10.0.107.153 – 10.0.107.154	10.0.107.155
232	10.0.107.156/30	10.0.107.157 – 10.0.107.158	10.0.107.159
233	10.0.107.160/30	10.0.107.161 – 10.0.107.162	10.0.107.163
234	10.0.107.164/30	10.0.107.165 – 10.0.107.166	10.0.107.167
235	10.0.107.168/30	10.0.107.169 – 10.0.107.170	10.0.107.171
236	10.0.107.172/30	10.0.107.173 – 10.0.107.174	10.0.107.175
237	10.0.107.176/30	10.0.107.177 – 10.0.107.178	10.0.107.179
238	10.0.107.180/30	10.0.107.181 – 10.0.107.182	10.0.107.183
239	10.0.107.184/30	10.0.107.185 – 10.0.107.186	10.0.107.187
240	10.0.107.188/30	10.0.107.189 – 10.0.107.190	10.0.107.191
241	10.0.107.192/30	10.0.107.193 – 10.0.107.194	10.0.107.195
242	10.0.107.196/30	10.0.107.197 – 10.0.107.198	10.0.107.199
243	10.0.107.200/30	10.0.107.201 – 10.0.107.202	10.0.107.203
244	10.0.107.204/30	10.0.107.205 – 10.0.107.206	10.0.107.207
245	10.0.107.208/30	10.0.107.209 – 10.0.107.210	10.0.107.211
246	10.0.107.212/30	10.0.107.213 – 10.0.107.214	10.0.107.215
247	10.0.107.216/30	10.0.107.217 – 10.0.107.218	10.0.107.219
248	10.0.107.220/30	10.0.107.221 – 10.0.107.222	10.0.107.223
249	10.0.107.224/30	10.0.107.225 – 10.0.107.226	10.0.107.227
250	10.0.107.228/30	10.0.107.229 – 10.0.107.230	10.0.107.231
251	10.0.107.232/30	10.0.107.233 – 10.0.107.234	10.0.107.235
252	10.0.107.236/30	10.0.107.237 – 10.0.107.238	10.0.107.239
253	10.0.107.240/30	10.0.107.241 – 10.0.107.242	10.0.107.243
254	10.0.107.244/30	10.0.107.245 – 10.0.107.246	10.0.107.247
255	10.0.107.248/30	10.0.107.249 – 10.0.107.250	10.0.107.251
256	10.0.107.252/30	10.0.107.253 – 10.0.107.254	10.0.107.255

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 →