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)10.2.176.0/21

network10.2.176.0/21

broadcast10.2.183.255

first host10.2.176.1

last host10.2.183.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.176.0/21

address00001010.00000010.10110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.10110000.00000000

broadcast00001010.00000010.10110111.11111111

green = network part, grey = host part

hex0x0a02b000

decimal167948288

reverse dns0.176.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b000

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.176.0/30	10.2.176.1 – 10.2.176.2	10.2.176.3
2	10.2.176.4/30	10.2.176.5 – 10.2.176.6	10.2.176.7
3	10.2.176.8/30	10.2.176.9 – 10.2.176.10	10.2.176.11
4	10.2.176.12/30	10.2.176.13 – 10.2.176.14	10.2.176.15
5	10.2.176.16/30	10.2.176.17 – 10.2.176.18	10.2.176.19
6	10.2.176.20/30	10.2.176.21 – 10.2.176.22	10.2.176.23
7	10.2.176.24/30	10.2.176.25 – 10.2.176.26	10.2.176.27
8	10.2.176.28/30	10.2.176.29 – 10.2.176.30	10.2.176.31
9	10.2.176.32/30	10.2.176.33 – 10.2.176.34	10.2.176.35
10	10.2.176.36/30	10.2.176.37 – 10.2.176.38	10.2.176.39
11	10.2.176.40/30	10.2.176.41 – 10.2.176.42	10.2.176.43
12	10.2.176.44/30	10.2.176.45 – 10.2.176.46	10.2.176.47
13	10.2.176.48/30	10.2.176.49 – 10.2.176.50	10.2.176.51
14	10.2.176.52/30	10.2.176.53 – 10.2.176.54	10.2.176.55
15	10.2.176.56/30	10.2.176.57 – 10.2.176.58	10.2.176.59
16	10.2.176.60/30	10.2.176.61 – 10.2.176.62	10.2.176.63
17	10.2.176.64/30	10.2.176.65 – 10.2.176.66	10.2.176.67
18	10.2.176.68/30	10.2.176.69 – 10.2.176.70	10.2.176.71
19	10.2.176.72/30	10.2.176.73 – 10.2.176.74	10.2.176.75
20	10.2.176.76/30	10.2.176.77 – 10.2.176.78	10.2.176.79
21	10.2.176.80/30	10.2.176.81 – 10.2.176.82	10.2.176.83
22	10.2.176.84/30	10.2.176.85 – 10.2.176.86	10.2.176.87
23	10.2.176.88/30	10.2.176.89 – 10.2.176.90	10.2.176.91
24	10.2.176.92/30	10.2.176.93 – 10.2.176.94	10.2.176.95
25	10.2.176.96/30	10.2.176.97 – 10.2.176.98	10.2.176.99
26	10.2.176.100/30	10.2.176.101 – 10.2.176.102	10.2.176.103
27	10.2.176.104/30	10.2.176.105 – 10.2.176.106	10.2.176.107
28	10.2.176.108/30	10.2.176.109 – 10.2.176.110	10.2.176.111
29	10.2.176.112/30	10.2.176.113 – 10.2.176.114	10.2.176.115
30	10.2.176.116/30	10.2.176.117 – 10.2.176.118	10.2.176.119
31	10.2.176.120/30	10.2.176.121 – 10.2.176.122	10.2.176.123
32	10.2.176.124/30	10.2.176.125 – 10.2.176.126	10.2.176.127
33	10.2.176.128/30	10.2.176.129 – 10.2.176.130	10.2.176.131
34	10.2.176.132/30	10.2.176.133 – 10.2.176.134	10.2.176.135
35	10.2.176.136/30	10.2.176.137 – 10.2.176.138	10.2.176.139
36	10.2.176.140/30	10.2.176.141 – 10.2.176.142	10.2.176.143
37	10.2.176.144/30	10.2.176.145 – 10.2.176.146	10.2.176.147
38	10.2.176.148/30	10.2.176.149 – 10.2.176.150	10.2.176.151
39	10.2.176.152/30	10.2.176.153 – 10.2.176.154	10.2.176.155
40	10.2.176.156/30	10.2.176.157 – 10.2.176.158	10.2.176.159
41	10.2.176.160/30	10.2.176.161 – 10.2.176.162	10.2.176.163
42	10.2.176.164/30	10.2.176.165 – 10.2.176.166	10.2.176.167
43	10.2.176.168/30	10.2.176.169 – 10.2.176.170	10.2.176.171
44	10.2.176.172/30	10.2.176.173 – 10.2.176.174	10.2.176.175
45	10.2.176.176/30	10.2.176.177 – 10.2.176.178	10.2.176.179
46	10.2.176.180/30	10.2.176.181 – 10.2.176.182	10.2.176.183
47	10.2.176.184/30	10.2.176.185 – 10.2.176.186	10.2.176.187
48	10.2.176.188/30	10.2.176.189 – 10.2.176.190	10.2.176.191
49	10.2.176.192/30	10.2.176.193 – 10.2.176.194	10.2.176.195
50	10.2.176.196/30	10.2.176.197 – 10.2.176.198	10.2.176.199
51	10.2.176.200/30	10.2.176.201 – 10.2.176.202	10.2.176.203
52	10.2.176.204/30	10.2.176.205 – 10.2.176.206	10.2.176.207
53	10.2.176.208/30	10.2.176.209 – 10.2.176.210	10.2.176.211
54	10.2.176.212/30	10.2.176.213 – 10.2.176.214	10.2.176.215
55	10.2.176.216/30	10.2.176.217 – 10.2.176.218	10.2.176.219
56	10.2.176.220/30	10.2.176.221 – 10.2.176.222	10.2.176.223
57	10.2.176.224/30	10.2.176.225 – 10.2.176.226	10.2.176.227
58	10.2.176.228/30	10.2.176.229 – 10.2.176.230	10.2.176.231
59	10.2.176.232/30	10.2.176.233 – 10.2.176.234	10.2.176.235
60	10.2.176.236/30	10.2.176.237 – 10.2.176.238	10.2.176.239
61	10.2.176.240/30	10.2.176.241 – 10.2.176.242	10.2.176.243
62	10.2.176.244/30	10.2.176.245 – 10.2.176.246	10.2.176.247
63	10.2.176.248/30	10.2.176.249 – 10.2.176.250	10.2.176.251
64	10.2.176.252/30	10.2.176.253 – 10.2.176.254	10.2.176.255
65	10.2.177.0/30	10.2.177.1 – 10.2.177.2	10.2.177.3
66	10.2.177.4/30	10.2.177.5 – 10.2.177.6	10.2.177.7
67	10.2.177.8/30	10.2.177.9 – 10.2.177.10	10.2.177.11
68	10.2.177.12/30	10.2.177.13 – 10.2.177.14	10.2.177.15
69	10.2.177.16/30	10.2.177.17 – 10.2.177.18	10.2.177.19
70	10.2.177.20/30	10.2.177.21 – 10.2.177.22	10.2.177.23
71	10.2.177.24/30	10.2.177.25 – 10.2.177.26	10.2.177.27
72	10.2.177.28/30	10.2.177.29 – 10.2.177.30	10.2.177.31
73	10.2.177.32/30	10.2.177.33 – 10.2.177.34	10.2.177.35
74	10.2.177.36/30	10.2.177.37 – 10.2.177.38	10.2.177.39
75	10.2.177.40/30	10.2.177.41 – 10.2.177.42	10.2.177.43
76	10.2.177.44/30	10.2.177.45 – 10.2.177.46	10.2.177.47
77	10.2.177.48/30	10.2.177.49 – 10.2.177.50	10.2.177.51
78	10.2.177.52/30	10.2.177.53 – 10.2.177.54	10.2.177.55
79	10.2.177.56/30	10.2.177.57 – 10.2.177.58	10.2.177.59
80	10.2.177.60/30	10.2.177.61 – 10.2.177.62	10.2.177.63
81	10.2.177.64/30	10.2.177.65 – 10.2.177.66	10.2.177.67
82	10.2.177.68/30	10.2.177.69 – 10.2.177.70	10.2.177.71
83	10.2.177.72/30	10.2.177.73 – 10.2.177.74	10.2.177.75
84	10.2.177.76/30	10.2.177.77 – 10.2.177.78	10.2.177.79
85	10.2.177.80/30	10.2.177.81 – 10.2.177.82	10.2.177.83
86	10.2.177.84/30	10.2.177.85 – 10.2.177.86	10.2.177.87
87	10.2.177.88/30	10.2.177.89 – 10.2.177.90	10.2.177.91
88	10.2.177.92/30	10.2.177.93 – 10.2.177.94	10.2.177.95
89	10.2.177.96/30	10.2.177.97 – 10.2.177.98	10.2.177.99
90	10.2.177.100/30	10.2.177.101 – 10.2.177.102	10.2.177.103
91	10.2.177.104/30	10.2.177.105 – 10.2.177.106	10.2.177.107
92	10.2.177.108/30	10.2.177.109 – 10.2.177.110	10.2.177.111
93	10.2.177.112/30	10.2.177.113 – 10.2.177.114	10.2.177.115
94	10.2.177.116/30	10.2.177.117 – 10.2.177.118	10.2.177.119
95	10.2.177.120/30	10.2.177.121 – 10.2.177.122	10.2.177.123
96	10.2.177.124/30	10.2.177.125 – 10.2.177.126	10.2.177.127
97	10.2.177.128/30	10.2.177.129 – 10.2.177.130	10.2.177.131
98	10.2.177.132/30	10.2.177.133 – 10.2.177.134	10.2.177.135
99	10.2.177.136/30	10.2.177.137 – 10.2.177.138	10.2.177.139
100	10.2.177.140/30	10.2.177.141 – 10.2.177.142	10.2.177.143
101	10.2.177.144/30	10.2.177.145 – 10.2.177.146	10.2.177.147
102	10.2.177.148/30	10.2.177.149 – 10.2.177.150	10.2.177.151
103	10.2.177.152/30	10.2.177.153 – 10.2.177.154	10.2.177.155
104	10.2.177.156/30	10.2.177.157 – 10.2.177.158	10.2.177.159
105	10.2.177.160/30	10.2.177.161 – 10.2.177.162	10.2.177.163
106	10.2.177.164/30	10.2.177.165 – 10.2.177.166	10.2.177.167
107	10.2.177.168/30	10.2.177.169 – 10.2.177.170	10.2.177.171
108	10.2.177.172/30	10.2.177.173 – 10.2.177.174	10.2.177.175
109	10.2.177.176/30	10.2.177.177 – 10.2.177.178	10.2.177.179
110	10.2.177.180/30	10.2.177.181 – 10.2.177.182	10.2.177.183
111	10.2.177.184/30	10.2.177.185 – 10.2.177.186	10.2.177.187
112	10.2.177.188/30	10.2.177.189 – 10.2.177.190	10.2.177.191
113	10.2.177.192/30	10.2.177.193 – 10.2.177.194	10.2.177.195
114	10.2.177.196/30	10.2.177.197 – 10.2.177.198	10.2.177.199
115	10.2.177.200/30	10.2.177.201 – 10.2.177.202	10.2.177.203
116	10.2.177.204/30	10.2.177.205 – 10.2.177.206	10.2.177.207
117	10.2.177.208/30	10.2.177.209 – 10.2.177.210	10.2.177.211
118	10.2.177.212/30	10.2.177.213 – 10.2.177.214	10.2.177.215
119	10.2.177.216/30	10.2.177.217 – 10.2.177.218	10.2.177.219
120	10.2.177.220/30	10.2.177.221 – 10.2.177.222	10.2.177.223
121	10.2.177.224/30	10.2.177.225 – 10.2.177.226	10.2.177.227
122	10.2.177.228/30	10.2.177.229 – 10.2.177.230	10.2.177.231
123	10.2.177.232/30	10.2.177.233 – 10.2.177.234	10.2.177.235
124	10.2.177.236/30	10.2.177.237 – 10.2.177.238	10.2.177.239
125	10.2.177.240/30	10.2.177.241 – 10.2.177.242	10.2.177.243
126	10.2.177.244/30	10.2.177.245 – 10.2.177.246	10.2.177.247
127	10.2.177.248/30	10.2.177.249 – 10.2.177.250	10.2.177.251
128	10.2.177.252/30	10.2.177.253 – 10.2.177.254	10.2.177.255
129	10.2.178.0/30	10.2.178.1 – 10.2.178.2	10.2.178.3
130	10.2.178.4/30	10.2.178.5 – 10.2.178.6	10.2.178.7
131	10.2.178.8/30	10.2.178.9 – 10.2.178.10	10.2.178.11
132	10.2.178.12/30	10.2.178.13 – 10.2.178.14	10.2.178.15
133	10.2.178.16/30	10.2.178.17 – 10.2.178.18	10.2.178.19
134	10.2.178.20/30	10.2.178.21 – 10.2.178.22	10.2.178.23
135	10.2.178.24/30	10.2.178.25 – 10.2.178.26	10.2.178.27
136	10.2.178.28/30	10.2.178.29 – 10.2.178.30	10.2.178.31
137	10.2.178.32/30	10.2.178.33 – 10.2.178.34	10.2.178.35
138	10.2.178.36/30	10.2.178.37 – 10.2.178.38	10.2.178.39
139	10.2.178.40/30	10.2.178.41 – 10.2.178.42	10.2.178.43
140	10.2.178.44/30	10.2.178.45 – 10.2.178.46	10.2.178.47
141	10.2.178.48/30	10.2.178.49 – 10.2.178.50	10.2.178.51
142	10.2.178.52/30	10.2.178.53 – 10.2.178.54	10.2.178.55
143	10.2.178.56/30	10.2.178.57 – 10.2.178.58	10.2.178.59
144	10.2.178.60/30	10.2.178.61 – 10.2.178.62	10.2.178.63
145	10.2.178.64/30	10.2.178.65 – 10.2.178.66	10.2.178.67
146	10.2.178.68/30	10.2.178.69 – 10.2.178.70	10.2.178.71
147	10.2.178.72/30	10.2.178.73 – 10.2.178.74	10.2.178.75
148	10.2.178.76/30	10.2.178.77 – 10.2.178.78	10.2.178.79
149	10.2.178.80/30	10.2.178.81 – 10.2.178.82	10.2.178.83
150	10.2.178.84/30	10.2.178.85 – 10.2.178.86	10.2.178.87
151	10.2.178.88/30	10.2.178.89 – 10.2.178.90	10.2.178.91
152	10.2.178.92/30	10.2.178.93 – 10.2.178.94	10.2.178.95
153	10.2.178.96/30	10.2.178.97 – 10.2.178.98	10.2.178.99
154	10.2.178.100/30	10.2.178.101 – 10.2.178.102	10.2.178.103
155	10.2.178.104/30	10.2.178.105 – 10.2.178.106	10.2.178.107
156	10.2.178.108/30	10.2.178.109 – 10.2.178.110	10.2.178.111
157	10.2.178.112/30	10.2.178.113 – 10.2.178.114	10.2.178.115
158	10.2.178.116/30	10.2.178.117 – 10.2.178.118	10.2.178.119
159	10.2.178.120/30	10.2.178.121 – 10.2.178.122	10.2.178.123
160	10.2.178.124/30	10.2.178.125 – 10.2.178.126	10.2.178.127
161	10.2.178.128/30	10.2.178.129 – 10.2.178.130	10.2.178.131
162	10.2.178.132/30	10.2.178.133 – 10.2.178.134	10.2.178.135
163	10.2.178.136/30	10.2.178.137 – 10.2.178.138	10.2.178.139
164	10.2.178.140/30	10.2.178.141 – 10.2.178.142	10.2.178.143
165	10.2.178.144/30	10.2.178.145 – 10.2.178.146	10.2.178.147
166	10.2.178.148/30	10.2.178.149 – 10.2.178.150	10.2.178.151
167	10.2.178.152/30	10.2.178.153 – 10.2.178.154	10.2.178.155
168	10.2.178.156/30	10.2.178.157 – 10.2.178.158	10.2.178.159
169	10.2.178.160/30	10.2.178.161 – 10.2.178.162	10.2.178.163
170	10.2.178.164/30	10.2.178.165 – 10.2.178.166	10.2.178.167
171	10.2.178.168/30	10.2.178.169 – 10.2.178.170	10.2.178.171
172	10.2.178.172/30	10.2.178.173 – 10.2.178.174	10.2.178.175
173	10.2.178.176/30	10.2.178.177 – 10.2.178.178	10.2.178.179
174	10.2.178.180/30	10.2.178.181 – 10.2.178.182	10.2.178.183
175	10.2.178.184/30	10.2.178.185 – 10.2.178.186	10.2.178.187
176	10.2.178.188/30	10.2.178.189 – 10.2.178.190	10.2.178.191
177	10.2.178.192/30	10.2.178.193 – 10.2.178.194	10.2.178.195
178	10.2.178.196/30	10.2.178.197 – 10.2.178.198	10.2.178.199
179	10.2.178.200/30	10.2.178.201 – 10.2.178.202	10.2.178.203
180	10.2.178.204/30	10.2.178.205 – 10.2.178.206	10.2.178.207
181	10.2.178.208/30	10.2.178.209 – 10.2.178.210	10.2.178.211
182	10.2.178.212/30	10.2.178.213 – 10.2.178.214	10.2.178.215
183	10.2.178.216/30	10.2.178.217 – 10.2.178.218	10.2.178.219
184	10.2.178.220/30	10.2.178.221 – 10.2.178.222	10.2.178.223
185	10.2.178.224/30	10.2.178.225 – 10.2.178.226	10.2.178.227
186	10.2.178.228/30	10.2.178.229 – 10.2.178.230	10.2.178.231
187	10.2.178.232/30	10.2.178.233 – 10.2.178.234	10.2.178.235
188	10.2.178.236/30	10.2.178.237 – 10.2.178.238	10.2.178.239
189	10.2.178.240/30	10.2.178.241 – 10.2.178.242	10.2.178.243
190	10.2.178.244/30	10.2.178.245 – 10.2.178.246	10.2.178.247
191	10.2.178.248/30	10.2.178.249 – 10.2.178.250	10.2.178.251
192	10.2.178.252/30	10.2.178.253 – 10.2.178.254	10.2.178.255
193	10.2.179.0/30	10.2.179.1 – 10.2.179.2	10.2.179.3
194	10.2.179.4/30	10.2.179.5 – 10.2.179.6	10.2.179.7
195	10.2.179.8/30	10.2.179.9 – 10.2.179.10	10.2.179.11
196	10.2.179.12/30	10.2.179.13 – 10.2.179.14	10.2.179.15
197	10.2.179.16/30	10.2.179.17 – 10.2.179.18	10.2.179.19
198	10.2.179.20/30	10.2.179.21 – 10.2.179.22	10.2.179.23
199	10.2.179.24/30	10.2.179.25 – 10.2.179.26	10.2.179.27
200	10.2.179.28/30	10.2.179.29 – 10.2.179.30	10.2.179.31
201	10.2.179.32/30	10.2.179.33 – 10.2.179.34	10.2.179.35
202	10.2.179.36/30	10.2.179.37 – 10.2.179.38	10.2.179.39
203	10.2.179.40/30	10.2.179.41 – 10.2.179.42	10.2.179.43
204	10.2.179.44/30	10.2.179.45 – 10.2.179.46	10.2.179.47
205	10.2.179.48/30	10.2.179.49 – 10.2.179.50	10.2.179.51
206	10.2.179.52/30	10.2.179.53 – 10.2.179.54	10.2.179.55
207	10.2.179.56/30	10.2.179.57 – 10.2.179.58	10.2.179.59
208	10.2.179.60/30	10.2.179.61 – 10.2.179.62	10.2.179.63
209	10.2.179.64/30	10.2.179.65 – 10.2.179.66	10.2.179.67
210	10.2.179.68/30	10.2.179.69 – 10.2.179.70	10.2.179.71
211	10.2.179.72/30	10.2.179.73 – 10.2.179.74	10.2.179.75
212	10.2.179.76/30	10.2.179.77 – 10.2.179.78	10.2.179.79
213	10.2.179.80/30	10.2.179.81 – 10.2.179.82	10.2.179.83
214	10.2.179.84/30	10.2.179.85 – 10.2.179.86	10.2.179.87
215	10.2.179.88/30	10.2.179.89 – 10.2.179.90	10.2.179.91
216	10.2.179.92/30	10.2.179.93 – 10.2.179.94	10.2.179.95
217	10.2.179.96/30	10.2.179.97 – 10.2.179.98	10.2.179.99
218	10.2.179.100/30	10.2.179.101 – 10.2.179.102	10.2.179.103
219	10.2.179.104/30	10.2.179.105 – 10.2.179.106	10.2.179.107
220	10.2.179.108/30	10.2.179.109 – 10.2.179.110	10.2.179.111
221	10.2.179.112/30	10.2.179.113 – 10.2.179.114	10.2.179.115
222	10.2.179.116/30	10.2.179.117 – 10.2.179.118	10.2.179.119
223	10.2.179.120/30	10.2.179.121 – 10.2.179.122	10.2.179.123
224	10.2.179.124/30	10.2.179.125 – 10.2.179.126	10.2.179.127
225	10.2.179.128/30	10.2.179.129 – 10.2.179.130	10.2.179.131
226	10.2.179.132/30	10.2.179.133 – 10.2.179.134	10.2.179.135
227	10.2.179.136/30	10.2.179.137 – 10.2.179.138	10.2.179.139
228	10.2.179.140/30	10.2.179.141 – 10.2.179.142	10.2.179.143
229	10.2.179.144/30	10.2.179.145 – 10.2.179.146	10.2.179.147
230	10.2.179.148/30	10.2.179.149 – 10.2.179.150	10.2.179.151
231	10.2.179.152/30	10.2.179.153 – 10.2.179.154	10.2.179.155
232	10.2.179.156/30	10.2.179.157 – 10.2.179.158	10.2.179.159
233	10.2.179.160/30	10.2.179.161 – 10.2.179.162	10.2.179.163
234	10.2.179.164/30	10.2.179.165 – 10.2.179.166	10.2.179.167
235	10.2.179.168/30	10.2.179.169 – 10.2.179.170	10.2.179.171
236	10.2.179.172/30	10.2.179.173 – 10.2.179.174	10.2.179.175
237	10.2.179.176/30	10.2.179.177 – 10.2.179.178	10.2.179.179
238	10.2.179.180/30	10.2.179.181 – 10.2.179.182	10.2.179.183
239	10.2.179.184/30	10.2.179.185 – 10.2.179.186	10.2.179.187
240	10.2.179.188/30	10.2.179.189 – 10.2.179.190	10.2.179.191
241	10.2.179.192/30	10.2.179.193 – 10.2.179.194	10.2.179.195
242	10.2.179.196/30	10.2.179.197 – 10.2.179.198	10.2.179.199
243	10.2.179.200/30	10.2.179.201 – 10.2.179.202	10.2.179.203
244	10.2.179.204/30	10.2.179.205 – 10.2.179.206	10.2.179.207
245	10.2.179.208/30	10.2.179.209 – 10.2.179.210	10.2.179.211
246	10.2.179.212/30	10.2.179.213 – 10.2.179.214	10.2.179.215
247	10.2.179.216/30	10.2.179.217 – 10.2.179.218	10.2.179.219
248	10.2.179.220/30	10.2.179.221 – 10.2.179.222	10.2.179.223
249	10.2.179.224/30	10.2.179.225 – 10.2.179.226	10.2.179.227
250	10.2.179.228/30	10.2.179.229 – 10.2.179.230	10.2.179.231
251	10.2.179.232/30	10.2.179.233 – 10.2.179.234	10.2.179.235
252	10.2.179.236/30	10.2.179.237 – 10.2.179.238	10.2.179.239
253	10.2.179.240/30	10.2.179.241 – 10.2.179.242	10.2.179.243
254	10.2.179.244/30	10.2.179.245 – 10.2.179.246	10.2.179.247
255	10.2.179.248/30	10.2.179.249 – 10.2.179.250	10.2.179.251
256	10.2.179.252/30	10.2.179.253 – 10.2.179.254	10.2.179.255

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 →