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)10.5.176.0/21

network10.5.176.0/21

broadcast10.5.183.255

first host10.5.176.1

last host10.5.183.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.176.0/21

address00001010.00000101.10110000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.10110000.00000000

broadcast00001010.00000101.10110111.11111111

green = network part, grey = host part

hex0x0a05b000

decimal168144896

reverse dns0.176.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:b000

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.5.176.0/31	10.5.176.0 – 10.5.176.1	10.5.176.1
2	10.5.176.2/31	10.5.176.2 – 10.5.176.3	10.5.176.3
3	10.5.176.4/31	10.5.176.4 – 10.5.176.5	10.5.176.5
4	10.5.176.6/31	10.5.176.6 – 10.5.176.7	10.5.176.7
5	10.5.176.8/31	10.5.176.8 – 10.5.176.9	10.5.176.9
6	10.5.176.10/31	10.5.176.10 – 10.5.176.11	10.5.176.11
7	10.5.176.12/31	10.5.176.12 – 10.5.176.13	10.5.176.13
8	10.5.176.14/31	10.5.176.14 – 10.5.176.15	10.5.176.15
9	10.5.176.16/31	10.5.176.16 – 10.5.176.17	10.5.176.17
10	10.5.176.18/31	10.5.176.18 – 10.5.176.19	10.5.176.19
11	10.5.176.20/31	10.5.176.20 – 10.5.176.21	10.5.176.21
12	10.5.176.22/31	10.5.176.22 – 10.5.176.23	10.5.176.23
13	10.5.176.24/31	10.5.176.24 – 10.5.176.25	10.5.176.25
14	10.5.176.26/31	10.5.176.26 – 10.5.176.27	10.5.176.27
15	10.5.176.28/31	10.5.176.28 – 10.5.176.29	10.5.176.29
16	10.5.176.30/31	10.5.176.30 – 10.5.176.31	10.5.176.31
17	10.5.176.32/31	10.5.176.32 – 10.5.176.33	10.5.176.33
18	10.5.176.34/31	10.5.176.34 – 10.5.176.35	10.5.176.35
19	10.5.176.36/31	10.5.176.36 – 10.5.176.37	10.5.176.37
20	10.5.176.38/31	10.5.176.38 – 10.5.176.39	10.5.176.39
21	10.5.176.40/31	10.5.176.40 – 10.5.176.41	10.5.176.41
22	10.5.176.42/31	10.5.176.42 – 10.5.176.43	10.5.176.43
23	10.5.176.44/31	10.5.176.44 – 10.5.176.45	10.5.176.45
24	10.5.176.46/31	10.5.176.46 – 10.5.176.47	10.5.176.47
25	10.5.176.48/31	10.5.176.48 – 10.5.176.49	10.5.176.49
26	10.5.176.50/31	10.5.176.50 – 10.5.176.51	10.5.176.51
27	10.5.176.52/31	10.5.176.52 – 10.5.176.53	10.5.176.53
28	10.5.176.54/31	10.5.176.54 – 10.5.176.55	10.5.176.55
29	10.5.176.56/31	10.5.176.56 – 10.5.176.57	10.5.176.57
30	10.5.176.58/31	10.5.176.58 – 10.5.176.59	10.5.176.59
31	10.5.176.60/31	10.5.176.60 – 10.5.176.61	10.5.176.61
32	10.5.176.62/31	10.5.176.62 – 10.5.176.63	10.5.176.63
33	10.5.176.64/31	10.5.176.64 – 10.5.176.65	10.5.176.65
34	10.5.176.66/31	10.5.176.66 – 10.5.176.67	10.5.176.67
35	10.5.176.68/31	10.5.176.68 – 10.5.176.69	10.5.176.69
36	10.5.176.70/31	10.5.176.70 – 10.5.176.71	10.5.176.71
37	10.5.176.72/31	10.5.176.72 – 10.5.176.73	10.5.176.73
38	10.5.176.74/31	10.5.176.74 – 10.5.176.75	10.5.176.75
39	10.5.176.76/31	10.5.176.76 – 10.5.176.77	10.5.176.77
40	10.5.176.78/31	10.5.176.78 – 10.5.176.79	10.5.176.79
41	10.5.176.80/31	10.5.176.80 – 10.5.176.81	10.5.176.81
42	10.5.176.82/31	10.5.176.82 – 10.5.176.83	10.5.176.83
43	10.5.176.84/31	10.5.176.84 – 10.5.176.85	10.5.176.85
44	10.5.176.86/31	10.5.176.86 – 10.5.176.87	10.5.176.87
45	10.5.176.88/31	10.5.176.88 – 10.5.176.89	10.5.176.89
46	10.5.176.90/31	10.5.176.90 – 10.5.176.91	10.5.176.91
47	10.5.176.92/31	10.5.176.92 – 10.5.176.93	10.5.176.93
48	10.5.176.94/31	10.5.176.94 – 10.5.176.95	10.5.176.95
49	10.5.176.96/31	10.5.176.96 – 10.5.176.97	10.5.176.97
50	10.5.176.98/31	10.5.176.98 – 10.5.176.99	10.5.176.99
51	10.5.176.100/31	10.5.176.100 – 10.5.176.101	10.5.176.101
52	10.5.176.102/31	10.5.176.102 – 10.5.176.103	10.5.176.103
53	10.5.176.104/31	10.5.176.104 – 10.5.176.105	10.5.176.105
54	10.5.176.106/31	10.5.176.106 – 10.5.176.107	10.5.176.107
55	10.5.176.108/31	10.5.176.108 – 10.5.176.109	10.5.176.109
56	10.5.176.110/31	10.5.176.110 – 10.5.176.111	10.5.176.111
57	10.5.176.112/31	10.5.176.112 – 10.5.176.113	10.5.176.113
58	10.5.176.114/31	10.5.176.114 – 10.5.176.115	10.5.176.115
59	10.5.176.116/31	10.5.176.116 – 10.5.176.117	10.5.176.117
60	10.5.176.118/31	10.5.176.118 – 10.5.176.119	10.5.176.119
61	10.5.176.120/31	10.5.176.120 – 10.5.176.121	10.5.176.121
62	10.5.176.122/31	10.5.176.122 – 10.5.176.123	10.5.176.123
63	10.5.176.124/31	10.5.176.124 – 10.5.176.125	10.5.176.125
64	10.5.176.126/31	10.5.176.126 – 10.5.176.127	10.5.176.127
65	10.5.176.128/31	10.5.176.128 – 10.5.176.129	10.5.176.129
66	10.5.176.130/31	10.5.176.130 – 10.5.176.131	10.5.176.131
67	10.5.176.132/31	10.5.176.132 – 10.5.176.133	10.5.176.133
68	10.5.176.134/31	10.5.176.134 – 10.5.176.135	10.5.176.135
69	10.5.176.136/31	10.5.176.136 – 10.5.176.137	10.5.176.137
70	10.5.176.138/31	10.5.176.138 – 10.5.176.139	10.5.176.139
71	10.5.176.140/31	10.5.176.140 – 10.5.176.141	10.5.176.141
72	10.5.176.142/31	10.5.176.142 – 10.5.176.143	10.5.176.143
73	10.5.176.144/31	10.5.176.144 – 10.5.176.145	10.5.176.145
74	10.5.176.146/31	10.5.176.146 – 10.5.176.147	10.5.176.147
75	10.5.176.148/31	10.5.176.148 – 10.5.176.149	10.5.176.149
76	10.5.176.150/31	10.5.176.150 – 10.5.176.151	10.5.176.151
77	10.5.176.152/31	10.5.176.152 – 10.5.176.153	10.5.176.153
78	10.5.176.154/31	10.5.176.154 – 10.5.176.155	10.5.176.155
79	10.5.176.156/31	10.5.176.156 – 10.5.176.157	10.5.176.157
80	10.5.176.158/31	10.5.176.158 – 10.5.176.159	10.5.176.159
81	10.5.176.160/31	10.5.176.160 – 10.5.176.161	10.5.176.161
82	10.5.176.162/31	10.5.176.162 – 10.5.176.163	10.5.176.163
83	10.5.176.164/31	10.5.176.164 – 10.5.176.165	10.5.176.165
84	10.5.176.166/31	10.5.176.166 – 10.5.176.167	10.5.176.167
85	10.5.176.168/31	10.5.176.168 – 10.5.176.169	10.5.176.169
86	10.5.176.170/31	10.5.176.170 – 10.5.176.171	10.5.176.171
87	10.5.176.172/31	10.5.176.172 – 10.5.176.173	10.5.176.173
88	10.5.176.174/31	10.5.176.174 – 10.5.176.175	10.5.176.175
89	10.5.176.176/31	10.5.176.176 – 10.5.176.177	10.5.176.177
90	10.5.176.178/31	10.5.176.178 – 10.5.176.179	10.5.176.179
91	10.5.176.180/31	10.5.176.180 – 10.5.176.181	10.5.176.181
92	10.5.176.182/31	10.5.176.182 – 10.5.176.183	10.5.176.183
93	10.5.176.184/31	10.5.176.184 – 10.5.176.185	10.5.176.185
94	10.5.176.186/31	10.5.176.186 – 10.5.176.187	10.5.176.187
95	10.5.176.188/31	10.5.176.188 – 10.5.176.189	10.5.176.189
96	10.5.176.190/31	10.5.176.190 – 10.5.176.191	10.5.176.191
97	10.5.176.192/31	10.5.176.192 – 10.5.176.193	10.5.176.193
98	10.5.176.194/31	10.5.176.194 – 10.5.176.195	10.5.176.195
99	10.5.176.196/31	10.5.176.196 – 10.5.176.197	10.5.176.197
100	10.5.176.198/31	10.5.176.198 – 10.5.176.199	10.5.176.199
101	10.5.176.200/31	10.5.176.200 – 10.5.176.201	10.5.176.201
102	10.5.176.202/31	10.5.176.202 – 10.5.176.203	10.5.176.203
103	10.5.176.204/31	10.5.176.204 – 10.5.176.205	10.5.176.205
104	10.5.176.206/31	10.5.176.206 – 10.5.176.207	10.5.176.207
105	10.5.176.208/31	10.5.176.208 – 10.5.176.209	10.5.176.209
106	10.5.176.210/31	10.5.176.210 – 10.5.176.211	10.5.176.211
107	10.5.176.212/31	10.5.176.212 – 10.5.176.213	10.5.176.213
108	10.5.176.214/31	10.5.176.214 – 10.5.176.215	10.5.176.215
109	10.5.176.216/31	10.5.176.216 – 10.5.176.217	10.5.176.217
110	10.5.176.218/31	10.5.176.218 – 10.5.176.219	10.5.176.219
111	10.5.176.220/31	10.5.176.220 – 10.5.176.221	10.5.176.221
112	10.5.176.222/31	10.5.176.222 – 10.5.176.223	10.5.176.223
113	10.5.176.224/31	10.5.176.224 – 10.5.176.225	10.5.176.225
114	10.5.176.226/31	10.5.176.226 – 10.5.176.227	10.5.176.227
115	10.5.176.228/31	10.5.176.228 – 10.5.176.229	10.5.176.229
116	10.5.176.230/31	10.5.176.230 – 10.5.176.231	10.5.176.231
117	10.5.176.232/31	10.5.176.232 – 10.5.176.233	10.5.176.233
118	10.5.176.234/31	10.5.176.234 – 10.5.176.235	10.5.176.235
119	10.5.176.236/31	10.5.176.236 – 10.5.176.237	10.5.176.237
120	10.5.176.238/31	10.5.176.238 – 10.5.176.239	10.5.176.239
121	10.5.176.240/31	10.5.176.240 – 10.5.176.241	10.5.176.241
122	10.5.176.242/31	10.5.176.242 – 10.5.176.243	10.5.176.243
123	10.5.176.244/31	10.5.176.244 – 10.5.176.245	10.5.176.245
124	10.5.176.246/31	10.5.176.246 – 10.5.176.247	10.5.176.247
125	10.5.176.248/31	10.5.176.248 – 10.5.176.249	10.5.176.249
126	10.5.176.250/31	10.5.176.250 – 10.5.176.251	10.5.176.251
127	10.5.176.252/31	10.5.176.252 – 10.5.176.253	10.5.176.253
128	10.5.176.254/31	10.5.176.254 – 10.5.176.255	10.5.176.255
129	10.5.177.0/31	10.5.177.0 – 10.5.177.1	10.5.177.1
130	10.5.177.2/31	10.5.177.2 – 10.5.177.3	10.5.177.3
131	10.5.177.4/31	10.5.177.4 – 10.5.177.5	10.5.177.5
132	10.5.177.6/31	10.5.177.6 – 10.5.177.7	10.5.177.7
133	10.5.177.8/31	10.5.177.8 – 10.5.177.9	10.5.177.9
134	10.5.177.10/31	10.5.177.10 – 10.5.177.11	10.5.177.11
135	10.5.177.12/31	10.5.177.12 – 10.5.177.13	10.5.177.13
136	10.5.177.14/31	10.5.177.14 – 10.5.177.15	10.5.177.15
137	10.5.177.16/31	10.5.177.16 – 10.5.177.17	10.5.177.17
138	10.5.177.18/31	10.5.177.18 – 10.5.177.19	10.5.177.19
139	10.5.177.20/31	10.5.177.20 – 10.5.177.21	10.5.177.21
140	10.5.177.22/31	10.5.177.22 – 10.5.177.23	10.5.177.23
141	10.5.177.24/31	10.5.177.24 – 10.5.177.25	10.5.177.25
142	10.5.177.26/31	10.5.177.26 – 10.5.177.27	10.5.177.27
143	10.5.177.28/31	10.5.177.28 – 10.5.177.29	10.5.177.29
144	10.5.177.30/31	10.5.177.30 – 10.5.177.31	10.5.177.31
145	10.5.177.32/31	10.5.177.32 – 10.5.177.33	10.5.177.33
146	10.5.177.34/31	10.5.177.34 – 10.5.177.35	10.5.177.35
147	10.5.177.36/31	10.5.177.36 – 10.5.177.37	10.5.177.37
148	10.5.177.38/31	10.5.177.38 – 10.5.177.39	10.5.177.39
149	10.5.177.40/31	10.5.177.40 – 10.5.177.41	10.5.177.41
150	10.5.177.42/31	10.5.177.42 – 10.5.177.43	10.5.177.43
151	10.5.177.44/31	10.5.177.44 – 10.5.177.45	10.5.177.45
152	10.5.177.46/31	10.5.177.46 – 10.5.177.47	10.5.177.47
153	10.5.177.48/31	10.5.177.48 – 10.5.177.49	10.5.177.49
154	10.5.177.50/31	10.5.177.50 – 10.5.177.51	10.5.177.51
155	10.5.177.52/31	10.5.177.52 – 10.5.177.53	10.5.177.53
156	10.5.177.54/31	10.5.177.54 – 10.5.177.55	10.5.177.55
157	10.5.177.56/31	10.5.177.56 – 10.5.177.57	10.5.177.57
158	10.5.177.58/31	10.5.177.58 – 10.5.177.59	10.5.177.59
159	10.5.177.60/31	10.5.177.60 – 10.5.177.61	10.5.177.61
160	10.5.177.62/31	10.5.177.62 – 10.5.177.63	10.5.177.63
161	10.5.177.64/31	10.5.177.64 – 10.5.177.65	10.5.177.65
162	10.5.177.66/31	10.5.177.66 – 10.5.177.67	10.5.177.67
163	10.5.177.68/31	10.5.177.68 – 10.5.177.69	10.5.177.69
164	10.5.177.70/31	10.5.177.70 – 10.5.177.71	10.5.177.71
165	10.5.177.72/31	10.5.177.72 – 10.5.177.73	10.5.177.73
166	10.5.177.74/31	10.5.177.74 – 10.5.177.75	10.5.177.75
167	10.5.177.76/31	10.5.177.76 – 10.5.177.77	10.5.177.77
168	10.5.177.78/31	10.5.177.78 – 10.5.177.79	10.5.177.79
169	10.5.177.80/31	10.5.177.80 – 10.5.177.81	10.5.177.81
170	10.5.177.82/31	10.5.177.82 – 10.5.177.83	10.5.177.83
171	10.5.177.84/31	10.5.177.84 – 10.5.177.85	10.5.177.85
172	10.5.177.86/31	10.5.177.86 – 10.5.177.87	10.5.177.87
173	10.5.177.88/31	10.5.177.88 – 10.5.177.89	10.5.177.89
174	10.5.177.90/31	10.5.177.90 – 10.5.177.91	10.5.177.91
175	10.5.177.92/31	10.5.177.92 – 10.5.177.93	10.5.177.93
176	10.5.177.94/31	10.5.177.94 – 10.5.177.95	10.5.177.95
177	10.5.177.96/31	10.5.177.96 – 10.5.177.97	10.5.177.97
178	10.5.177.98/31	10.5.177.98 – 10.5.177.99	10.5.177.99
179	10.5.177.100/31	10.5.177.100 – 10.5.177.101	10.5.177.101
180	10.5.177.102/31	10.5.177.102 – 10.5.177.103	10.5.177.103
181	10.5.177.104/31	10.5.177.104 – 10.5.177.105	10.5.177.105
182	10.5.177.106/31	10.5.177.106 – 10.5.177.107	10.5.177.107
183	10.5.177.108/31	10.5.177.108 – 10.5.177.109	10.5.177.109
184	10.5.177.110/31	10.5.177.110 – 10.5.177.111	10.5.177.111
185	10.5.177.112/31	10.5.177.112 – 10.5.177.113	10.5.177.113
186	10.5.177.114/31	10.5.177.114 – 10.5.177.115	10.5.177.115
187	10.5.177.116/31	10.5.177.116 – 10.5.177.117	10.5.177.117
188	10.5.177.118/31	10.5.177.118 – 10.5.177.119	10.5.177.119
189	10.5.177.120/31	10.5.177.120 – 10.5.177.121	10.5.177.121
190	10.5.177.122/31	10.5.177.122 – 10.5.177.123	10.5.177.123
191	10.5.177.124/31	10.5.177.124 – 10.5.177.125	10.5.177.125
192	10.5.177.126/31	10.5.177.126 – 10.5.177.127	10.5.177.127
193	10.5.177.128/31	10.5.177.128 – 10.5.177.129	10.5.177.129
194	10.5.177.130/31	10.5.177.130 – 10.5.177.131	10.5.177.131
195	10.5.177.132/31	10.5.177.132 – 10.5.177.133	10.5.177.133
196	10.5.177.134/31	10.5.177.134 – 10.5.177.135	10.5.177.135
197	10.5.177.136/31	10.5.177.136 – 10.5.177.137	10.5.177.137
198	10.5.177.138/31	10.5.177.138 – 10.5.177.139	10.5.177.139
199	10.5.177.140/31	10.5.177.140 – 10.5.177.141	10.5.177.141
200	10.5.177.142/31	10.5.177.142 – 10.5.177.143	10.5.177.143
201	10.5.177.144/31	10.5.177.144 – 10.5.177.145	10.5.177.145
202	10.5.177.146/31	10.5.177.146 – 10.5.177.147	10.5.177.147
203	10.5.177.148/31	10.5.177.148 – 10.5.177.149	10.5.177.149
204	10.5.177.150/31	10.5.177.150 – 10.5.177.151	10.5.177.151
205	10.5.177.152/31	10.5.177.152 – 10.5.177.153	10.5.177.153
206	10.5.177.154/31	10.5.177.154 – 10.5.177.155	10.5.177.155
207	10.5.177.156/31	10.5.177.156 – 10.5.177.157	10.5.177.157
208	10.5.177.158/31	10.5.177.158 – 10.5.177.159	10.5.177.159
209	10.5.177.160/31	10.5.177.160 – 10.5.177.161	10.5.177.161
210	10.5.177.162/31	10.5.177.162 – 10.5.177.163	10.5.177.163
211	10.5.177.164/31	10.5.177.164 – 10.5.177.165	10.5.177.165
212	10.5.177.166/31	10.5.177.166 – 10.5.177.167	10.5.177.167
213	10.5.177.168/31	10.5.177.168 – 10.5.177.169	10.5.177.169
214	10.5.177.170/31	10.5.177.170 – 10.5.177.171	10.5.177.171
215	10.5.177.172/31	10.5.177.172 – 10.5.177.173	10.5.177.173
216	10.5.177.174/31	10.5.177.174 – 10.5.177.175	10.5.177.175
217	10.5.177.176/31	10.5.177.176 – 10.5.177.177	10.5.177.177
218	10.5.177.178/31	10.5.177.178 – 10.5.177.179	10.5.177.179
219	10.5.177.180/31	10.5.177.180 – 10.5.177.181	10.5.177.181
220	10.5.177.182/31	10.5.177.182 – 10.5.177.183	10.5.177.183
221	10.5.177.184/31	10.5.177.184 – 10.5.177.185	10.5.177.185
222	10.5.177.186/31	10.5.177.186 – 10.5.177.187	10.5.177.187
223	10.5.177.188/31	10.5.177.188 – 10.5.177.189	10.5.177.189
224	10.5.177.190/31	10.5.177.190 – 10.5.177.191	10.5.177.191
225	10.5.177.192/31	10.5.177.192 – 10.5.177.193	10.5.177.193
226	10.5.177.194/31	10.5.177.194 – 10.5.177.195	10.5.177.195
227	10.5.177.196/31	10.5.177.196 – 10.5.177.197	10.5.177.197
228	10.5.177.198/31	10.5.177.198 – 10.5.177.199	10.5.177.199
229	10.5.177.200/31	10.5.177.200 – 10.5.177.201	10.5.177.201
230	10.5.177.202/31	10.5.177.202 – 10.5.177.203	10.5.177.203
231	10.5.177.204/31	10.5.177.204 – 10.5.177.205	10.5.177.205
232	10.5.177.206/31	10.5.177.206 – 10.5.177.207	10.5.177.207
233	10.5.177.208/31	10.5.177.208 – 10.5.177.209	10.5.177.209
234	10.5.177.210/31	10.5.177.210 – 10.5.177.211	10.5.177.211
235	10.5.177.212/31	10.5.177.212 – 10.5.177.213	10.5.177.213
236	10.5.177.214/31	10.5.177.214 – 10.5.177.215	10.5.177.215
237	10.5.177.216/31	10.5.177.216 – 10.5.177.217	10.5.177.217
238	10.5.177.218/31	10.5.177.218 – 10.5.177.219	10.5.177.219
239	10.5.177.220/31	10.5.177.220 – 10.5.177.221	10.5.177.221
240	10.5.177.222/31	10.5.177.222 – 10.5.177.223	10.5.177.223
241	10.5.177.224/31	10.5.177.224 – 10.5.177.225	10.5.177.225
242	10.5.177.226/31	10.5.177.226 – 10.5.177.227	10.5.177.227
243	10.5.177.228/31	10.5.177.228 – 10.5.177.229	10.5.177.229
244	10.5.177.230/31	10.5.177.230 – 10.5.177.231	10.5.177.231
245	10.5.177.232/31	10.5.177.232 – 10.5.177.233	10.5.177.233
246	10.5.177.234/31	10.5.177.234 – 10.5.177.235	10.5.177.235
247	10.5.177.236/31	10.5.177.236 – 10.5.177.237	10.5.177.237
248	10.5.177.238/31	10.5.177.238 – 10.5.177.239	10.5.177.239
249	10.5.177.240/31	10.5.177.240 – 10.5.177.241	10.5.177.241
250	10.5.177.242/31	10.5.177.242 – 10.5.177.243	10.5.177.243
251	10.5.177.244/31	10.5.177.244 – 10.5.177.245	10.5.177.245
252	10.5.177.246/31	10.5.177.246 – 10.5.177.247	10.5.177.247
253	10.5.177.248/31	10.5.177.248 – 10.5.177.249	10.5.177.249
254	10.5.177.250/31	10.5.177.250 – 10.5.177.251	10.5.177.251
255	10.5.177.252/31	10.5.177.252 – 10.5.177.253	10.5.177.253
256	10.5.177.254/31	10.5.177.254 – 10.5.177.255	10.5.177.255

showing 256 of 1,024

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 →