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)10.5.120.0/21

network10.5.120.0/21

broadcast10.5.127.255

first host10.5.120.1

last host10.5.127.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.5.120.0/21

address00001010.00000101.01111000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000101.01111000.00000000

broadcast00001010.00000101.01111111.11111111

green = network part, grey = host part

hex0x0a057800

decimal168130560

reverse dns0.120.5.10.in-addr.arpa

ipv4-mapped::ffff:a05:7800

/21 split into /31 · 1,024 subnets

close ×

#	network	host range	broadcast
1	10.5.120.0/31	10.5.120.0 – 10.5.120.1	10.5.120.1
2	10.5.120.2/31	10.5.120.2 – 10.5.120.3	10.5.120.3
3	10.5.120.4/31	10.5.120.4 – 10.5.120.5	10.5.120.5
4	10.5.120.6/31	10.5.120.6 – 10.5.120.7	10.5.120.7
5	10.5.120.8/31	10.5.120.8 – 10.5.120.9	10.5.120.9
6	10.5.120.10/31	10.5.120.10 – 10.5.120.11	10.5.120.11
7	10.5.120.12/31	10.5.120.12 – 10.5.120.13	10.5.120.13
8	10.5.120.14/31	10.5.120.14 – 10.5.120.15	10.5.120.15
9	10.5.120.16/31	10.5.120.16 – 10.5.120.17	10.5.120.17
10	10.5.120.18/31	10.5.120.18 – 10.5.120.19	10.5.120.19
11	10.5.120.20/31	10.5.120.20 – 10.5.120.21	10.5.120.21
12	10.5.120.22/31	10.5.120.22 – 10.5.120.23	10.5.120.23
13	10.5.120.24/31	10.5.120.24 – 10.5.120.25	10.5.120.25
14	10.5.120.26/31	10.5.120.26 – 10.5.120.27	10.5.120.27
15	10.5.120.28/31	10.5.120.28 – 10.5.120.29	10.5.120.29
16	10.5.120.30/31	10.5.120.30 – 10.5.120.31	10.5.120.31
17	10.5.120.32/31	10.5.120.32 – 10.5.120.33	10.5.120.33
18	10.5.120.34/31	10.5.120.34 – 10.5.120.35	10.5.120.35
19	10.5.120.36/31	10.5.120.36 – 10.5.120.37	10.5.120.37
20	10.5.120.38/31	10.5.120.38 – 10.5.120.39	10.5.120.39
21	10.5.120.40/31	10.5.120.40 – 10.5.120.41	10.5.120.41
22	10.5.120.42/31	10.5.120.42 – 10.5.120.43	10.5.120.43
23	10.5.120.44/31	10.5.120.44 – 10.5.120.45	10.5.120.45
24	10.5.120.46/31	10.5.120.46 – 10.5.120.47	10.5.120.47
25	10.5.120.48/31	10.5.120.48 – 10.5.120.49	10.5.120.49
26	10.5.120.50/31	10.5.120.50 – 10.5.120.51	10.5.120.51
27	10.5.120.52/31	10.5.120.52 – 10.5.120.53	10.5.120.53
28	10.5.120.54/31	10.5.120.54 – 10.5.120.55	10.5.120.55
29	10.5.120.56/31	10.5.120.56 – 10.5.120.57	10.5.120.57
30	10.5.120.58/31	10.5.120.58 – 10.5.120.59	10.5.120.59
31	10.5.120.60/31	10.5.120.60 – 10.5.120.61	10.5.120.61
32	10.5.120.62/31	10.5.120.62 – 10.5.120.63	10.5.120.63
33	10.5.120.64/31	10.5.120.64 – 10.5.120.65	10.5.120.65
34	10.5.120.66/31	10.5.120.66 – 10.5.120.67	10.5.120.67
35	10.5.120.68/31	10.5.120.68 – 10.5.120.69	10.5.120.69
36	10.5.120.70/31	10.5.120.70 – 10.5.120.71	10.5.120.71
37	10.5.120.72/31	10.5.120.72 – 10.5.120.73	10.5.120.73
38	10.5.120.74/31	10.5.120.74 – 10.5.120.75	10.5.120.75
39	10.5.120.76/31	10.5.120.76 – 10.5.120.77	10.5.120.77
40	10.5.120.78/31	10.5.120.78 – 10.5.120.79	10.5.120.79
41	10.5.120.80/31	10.5.120.80 – 10.5.120.81	10.5.120.81
42	10.5.120.82/31	10.5.120.82 – 10.5.120.83	10.5.120.83
43	10.5.120.84/31	10.5.120.84 – 10.5.120.85	10.5.120.85
44	10.5.120.86/31	10.5.120.86 – 10.5.120.87	10.5.120.87
45	10.5.120.88/31	10.5.120.88 – 10.5.120.89	10.5.120.89
46	10.5.120.90/31	10.5.120.90 – 10.5.120.91	10.5.120.91
47	10.5.120.92/31	10.5.120.92 – 10.5.120.93	10.5.120.93
48	10.5.120.94/31	10.5.120.94 – 10.5.120.95	10.5.120.95
49	10.5.120.96/31	10.5.120.96 – 10.5.120.97	10.5.120.97
50	10.5.120.98/31	10.5.120.98 – 10.5.120.99	10.5.120.99
51	10.5.120.100/31	10.5.120.100 – 10.5.120.101	10.5.120.101
52	10.5.120.102/31	10.5.120.102 – 10.5.120.103	10.5.120.103
53	10.5.120.104/31	10.5.120.104 – 10.5.120.105	10.5.120.105
54	10.5.120.106/31	10.5.120.106 – 10.5.120.107	10.5.120.107
55	10.5.120.108/31	10.5.120.108 – 10.5.120.109	10.5.120.109
56	10.5.120.110/31	10.5.120.110 – 10.5.120.111	10.5.120.111
57	10.5.120.112/31	10.5.120.112 – 10.5.120.113	10.5.120.113
58	10.5.120.114/31	10.5.120.114 – 10.5.120.115	10.5.120.115
59	10.5.120.116/31	10.5.120.116 – 10.5.120.117	10.5.120.117
60	10.5.120.118/31	10.5.120.118 – 10.5.120.119	10.5.120.119
61	10.5.120.120/31	10.5.120.120 – 10.5.120.121	10.5.120.121
62	10.5.120.122/31	10.5.120.122 – 10.5.120.123	10.5.120.123
63	10.5.120.124/31	10.5.120.124 – 10.5.120.125	10.5.120.125
64	10.5.120.126/31	10.5.120.126 – 10.5.120.127	10.5.120.127
65	10.5.120.128/31	10.5.120.128 – 10.5.120.129	10.5.120.129
66	10.5.120.130/31	10.5.120.130 – 10.5.120.131	10.5.120.131
67	10.5.120.132/31	10.5.120.132 – 10.5.120.133	10.5.120.133
68	10.5.120.134/31	10.5.120.134 – 10.5.120.135	10.5.120.135
69	10.5.120.136/31	10.5.120.136 – 10.5.120.137	10.5.120.137
70	10.5.120.138/31	10.5.120.138 – 10.5.120.139	10.5.120.139
71	10.5.120.140/31	10.5.120.140 – 10.5.120.141	10.5.120.141
72	10.5.120.142/31	10.5.120.142 – 10.5.120.143	10.5.120.143
73	10.5.120.144/31	10.5.120.144 – 10.5.120.145	10.5.120.145
74	10.5.120.146/31	10.5.120.146 – 10.5.120.147	10.5.120.147
75	10.5.120.148/31	10.5.120.148 – 10.5.120.149	10.5.120.149
76	10.5.120.150/31	10.5.120.150 – 10.5.120.151	10.5.120.151
77	10.5.120.152/31	10.5.120.152 – 10.5.120.153	10.5.120.153
78	10.5.120.154/31	10.5.120.154 – 10.5.120.155	10.5.120.155
79	10.5.120.156/31	10.5.120.156 – 10.5.120.157	10.5.120.157
80	10.5.120.158/31	10.5.120.158 – 10.5.120.159	10.5.120.159
81	10.5.120.160/31	10.5.120.160 – 10.5.120.161	10.5.120.161
82	10.5.120.162/31	10.5.120.162 – 10.5.120.163	10.5.120.163
83	10.5.120.164/31	10.5.120.164 – 10.5.120.165	10.5.120.165
84	10.5.120.166/31	10.5.120.166 – 10.5.120.167	10.5.120.167
85	10.5.120.168/31	10.5.120.168 – 10.5.120.169	10.5.120.169
86	10.5.120.170/31	10.5.120.170 – 10.5.120.171	10.5.120.171
87	10.5.120.172/31	10.5.120.172 – 10.5.120.173	10.5.120.173
88	10.5.120.174/31	10.5.120.174 – 10.5.120.175	10.5.120.175
89	10.5.120.176/31	10.5.120.176 – 10.5.120.177	10.5.120.177
90	10.5.120.178/31	10.5.120.178 – 10.5.120.179	10.5.120.179
91	10.5.120.180/31	10.5.120.180 – 10.5.120.181	10.5.120.181
92	10.5.120.182/31	10.5.120.182 – 10.5.120.183	10.5.120.183
93	10.5.120.184/31	10.5.120.184 – 10.5.120.185	10.5.120.185
94	10.5.120.186/31	10.5.120.186 – 10.5.120.187	10.5.120.187
95	10.5.120.188/31	10.5.120.188 – 10.5.120.189	10.5.120.189
96	10.5.120.190/31	10.5.120.190 – 10.5.120.191	10.5.120.191
97	10.5.120.192/31	10.5.120.192 – 10.5.120.193	10.5.120.193
98	10.5.120.194/31	10.5.120.194 – 10.5.120.195	10.5.120.195
99	10.5.120.196/31	10.5.120.196 – 10.5.120.197	10.5.120.197
100	10.5.120.198/31	10.5.120.198 – 10.5.120.199	10.5.120.199
101	10.5.120.200/31	10.5.120.200 – 10.5.120.201	10.5.120.201
102	10.5.120.202/31	10.5.120.202 – 10.5.120.203	10.5.120.203
103	10.5.120.204/31	10.5.120.204 – 10.5.120.205	10.5.120.205
104	10.5.120.206/31	10.5.120.206 – 10.5.120.207	10.5.120.207
105	10.5.120.208/31	10.5.120.208 – 10.5.120.209	10.5.120.209
106	10.5.120.210/31	10.5.120.210 – 10.5.120.211	10.5.120.211
107	10.5.120.212/31	10.5.120.212 – 10.5.120.213	10.5.120.213
108	10.5.120.214/31	10.5.120.214 – 10.5.120.215	10.5.120.215
109	10.5.120.216/31	10.5.120.216 – 10.5.120.217	10.5.120.217
110	10.5.120.218/31	10.5.120.218 – 10.5.120.219	10.5.120.219
111	10.5.120.220/31	10.5.120.220 – 10.5.120.221	10.5.120.221
112	10.5.120.222/31	10.5.120.222 – 10.5.120.223	10.5.120.223
113	10.5.120.224/31	10.5.120.224 – 10.5.120.225	10.5.120.225
114	10.5.120.226/31	10.5.120.226 – 10.5.120.227	10.5.120.227
115	10.5.120.228/31	10.5.120.228 – 10.5.120.229	10.5.120.229
116	10.5.120.230/31	10.5.120.230 – 10.5.120.231	10.5.120.231
117	10.5.120.232/31	10.5.120.232 – 10.5.120.233	10.5.120.233
118	10.5.120.234/31	10.5.120.234 – 10.5.120.235	10.5.120.235
119	10.5.120.236/31	10.5.120.236 – 10.5.120.237	10.5.120.237
120	10.5.120.238/31	10.5.120.238 – 10.5.120.239	10.5.120.239
121	10.5.120.240/31	10.5.120.240 – 10.5.120.241	10.5.120.241
122	10.5.120.242/31	10.5.120.242 – 10.5.120.243	10.5.120.243
123	10.5.120.244/31	10.5.120.244 – 10.5.120.245	10.5.120.245
124	10.5.120.246/31	10.5.120.246 – 10.5.120.247	10.5.120.247
125	10.5.120.248/31	10.5.120.248 – 10.5.120.249	10.5.120.249
126	10.5.120.250/31	10.5.120.250 – 10.5.120.251	10.5.120.251
127	10.5.120.252/31	10.5.120.252 – 10.5.120.253	10.5.120.253
128	10.5.120.254/31	10.5.120.254 – 10.5.120.255	10.5.120.255
129	10.5.121.0/31	10.5.121.0 – 10.5.121.1	10.5.121.1
130	10.5.121.2/31	10.5.121.2 – 10.5.121.3	10.5.121.3
131	10.5.121.4/31	10.5.121.4 – 10.5.121.5	10.5.121.5
132	10.5.121.6/31	10.5.121.6 – 10.5.121.7	10.5.121.7
133	10.5.121.8/31	10.5.121.8 – 10.5.121.9	10.5.121.9
134	10.5.121.10/31	10.5.121.10 – 10.5.121.11	10.5.121.11
135	10.5.121.12/31	10.5.121.12 – 10.5.121.13	10.5.121.13
136	10.5.121.14/31	10.5.121.14 – 10.5.121.15	10.5.121.15
137	10.5.121.16/31	10.5.121.16 – 10.5.121.17	10.5.121.17
138	10.5.121.18/31	10.5.121.18 – 10.5.121.19	10.5.121.19
139	10.5.121.20/31	10.5.121.20 – 10.5.121.21	10.5.121.21
140	10.5.121.22/31	10.5.121.22 – 10.5.121.23	10.5.121.23
141	10.5.121.24/31	10.5.121.24 – 10.5.121.25	10.5.121.25
142	10.5.121.26/31	10.5.121.26 – 10.5.121.27	10.5.121.27
143	10.5.121.28/31	10.5.121.28 – 10.5.121.29	10.5.121.29
144	10.5.121.30/31	10.5.121.30 – 10.5.121.31	10.5.121.31
145	10.5.121.32/31	10.5.121.32 – 10.5.121.33	10.5.121.33
146	10.5.121.34/31	10.5.121.34 – 10.5.121.35	10.5.121.35
147	10.5.121.36/31	10.5.121.36 – 10.5.121.37	10.5.121.37
148	10.5.121.38/31	10.5.121.38 – 10.5.121.39	10.5.121.39
149	10.5.121.40/31	10.5.121.40 – 10.5.121.41	10.5.121.41
150	10.5.121.42/31	10.5.121.42 – 10.5.121.43	10.5.121.43
151	10.5.121.44/31	10.5.121.44 – 10.5.121.45	10.5.121.45
152	10.5.121.46/31	10.5.121.46 – 10.5.121.47	10.5.121.47
153	10.5.121.48/31	10.5.121.48 – 10.5.121.49	10.5.121.49
154	10.5.121.50/31	10.5.121.50 – 10.5.121.51	10.5.121.51
155	10.5.121.52/31	10.5.121.52 – 10.5.121.53	10.5.121.53
156	10.5.121.54/31	10.5.121.54 – 10.5.121.55	10.5.121.55
157	10.5.121.56/31	10.5.121.56 – 10.5.121.57	10.5.121.57
158	10.5.121.58/31	10.5.121.58 – 10.5.121.59	10.5.121.59
159	10.5.121.60/31	10.5.121.60 – 10.5.121.61	10.5.121.61
160	10.5.121.62/31	10.5.121.62 – 10.5.121.63	10.5.121.63
161	10.5.121.64/31	10.5.121.64 – 10.5.121.65	10.5.121.65
162	10.5.121.66/31	10.5.121.66 – 10.5.121.67	10.5.121.67
163	10.5.121.68/31	10.5.121.68 – 10.5.121.69	10.5.121.69
164	10.5.121.70/31	10.5.121.70 – 10.5.121.71	10.5.121.71
165	10.5.121.72/31	10.5.121.72 – 10.5.121.73	10.5.121.73
166	10.5.121.74/31	10.5.121.74 – 10.5.121.75	10.5.121.75
167	10.5.121.76/31	10.5.121.76 – 10.5.121.77	10.5.121.77
168	10.5.121.78/31	10.5.121.78 – 10.5.121.79	10.5.121.79
169	10.5.121.80/31	10.5.121.80 – 10.5.121.81	10.5.121.81
170	10.5.121.82/31	10.5.121.82 – 10.5.121.83	10.5.121.83
171	10.5.121.84/31	10.5.121.84 – 10.5.121.85	10.5.121.85
172	10.5.121.86/31	10.5.121.86 – 10.5.121.87	10.5.121.87
173	10.5.121.88/31	10.5.121.88 – 10.5.121.89	10.5.121.89
174	10.5.121.90/31	10.5.121.90 – 10.5.121.91	10.5.121.91
175	10.5.121.92/31	10.5.121.92 – 10.5.121.93	10.5.121.93
176	10.5.121.94/31	10.5.121.94 – 10.5.121.95	10.5.121.95
177	10.5.121.96/31	10.5.121.96 – 10.5.121.97	10.5.121.97
178	10.5.121.98/31	10.5.121.98 – 10.5.121.99	10.5.121.99
179	10.5.121.100/31	10.5.121.100 – 10.5.121.101	10.5.121.101
180	10.5.121.102/31	10.5.121.102 – 10.5.121.103	10.5.121.103
181	10.5.121.104/31	10.5.121.104 – 10.5.121.105	10.5.121.105
182	10.5.121.106/31	10.5.121.106 – 10.5.121.107	10.5.121.107
183	10.5.121.108/31	10.5.121.108 – 10.5.121.109	10.5.121.109
184	10.5.121.110/31	10.5.121.110 – 10.5.121.111	10.5.121.111
185	10.5.121.112/31	10.5.121.112 – 10.5.121.113	10.5.121.113
186	10.5.121.114/31	10.5.121.114 – 10.5.121.115	10.5.121.115
187	10.5.121.116/31	10.5.121.116 – 10.5.121.117	10.5.121.117
188	10.5.121.118/31	10.5.121.118 – 10.5.121.119	10.5.121.119
189	10.5.121.120/31	10.5.121.120 – 10.5.121.121	10.5.121.121
190	10.5.121.122/31	10.5.121.122 – 10.5.121.123	10.5.121.123
191	10.5.121.124/31	10.5.121.124 – 10.5.121.125	10.5.121.125
192	10.5.121.126/31	10.5.121.126 – 10.5.121.127	10.5.121.127
193	10.5.121.128/31	10.5.121.128 – 10.5.121.129	10.5.121.129
194	10.5.121.130/31	10.5.121.130 – 10.5.121.131	10.5.121.131
195	10.5.121.132/31	10.5.121.132 – 10.5.121.133	10.5.121.133
196	10.5.121.134/31	10.5.121.134 – 10.5.121.135	10.5.121.135
197	10.5.121.136/31	10.5.121.136 – 10.5.121.137	10.5.121.137
198	10.5.121.138/31	10.5.121.138 – 10.5.121.139	10.5.121.139
199	10.5.121.140/31	10.5.121.140 – 10.5.121.141	10.5.121.141
200	10.5.121.142/31	10.5.121.142 – 10.5.121.143	10.5.121.143
201	10.5.121.144/31	10.5.121.144 – 10.5.121.145	10.5.121.145
202	10.5.121.146/31	10.5.121.146 – 10.5.121.147	10.5.121.147
203	10.5.121.148/31	10.5.121.148 – 10.5.121.149	10.5.121.149
204	10.5.121.150/31	10.5.121.150 – 10.5.121.151	10.5.121.151
205	10.5.121.152/31	10.5.121.152 – 10.5.121.153	10.5.121.153
206	10.5.121.154/31	10.5.121.154 – 10.5.121.155	10.5.121.155
207	10.5.121.156/31	10.5.121.156 – 10.5.121.157	10.5.121.157
208	10.5.121.158/31	10.5.121.158 – 10.5.121.159	10.5.121.159
209	10.5.121.160/31	10.5.121.160 – 10.5.121.161	10.5.121.161
210	10.5.121.162/31	10.5.121.162 – 10.5.121.163	10.5.121.163
211	10.5.121.164/31	10.5.121.164 – 10.5.121.165	10.5.121.165
212	10.5.121.166/31	10.5.121.166 – 10.5.121.167	10.5.121.167
213	10.5.121.168/31	10.5.121.168 – 10.5.121.169	10.5.121.169
214	10.5.121.170/31	10.5.121.170 – 10.5.121.171	10.5.121.171
215	10.5.121.172/31	10.5.121.172 – 10.5.121.173	10.5.121.173
216	10.5.121.174/31	10.5.121.174 – 10.5.121.175	10.5.121.175
217	10.5.121.176/31	10.5.121.176 – 10.5.121.177	10.5.121.177
218	10.5.121.178/31	10.5.121.178 – 10.5.121.179	10.5.121.179
219	10.5.121.180/31	10.5.121.180 – 10.5.121.181	10.5.121.181
220	10.5.121.182/31	10.5.121.182 – 10.5.121.183	10.5.121.183
221	10.5.121.184/31	10.5.121.184 – 10.5.121.185	10.5.121.185
222	10.5.121.186/31	10.5.121.186 – 10.5.121.187	10.5.121.187
223	10.5.121.188/31	10.5.121.188 – 10.5.121.189	10.5.121.189
224	10.5.121.190/31	10.5.121.190 – 10.5.121.191	10.5.121.191
225	10.5.121.192/31	10.5.121.192 – 10.5.121.193	10.5.121.193
226	10.5.121.194/31	10.5.121.194 – 10.5.121.195	10.5.121.195
227	10.5.121.196/31	10.5.121.196 – 10.5.121.197	10.5.121.197
228	10.5.121.198/31	10.5.121.198 – 10.5.121.199	10.5.121.199
229	10.5.121.200/31	10.5.121.200 – 10.5.121.201	10.5.121.201
230	10.5.121.202/31	10.5.121.202 – 10.5.121.203	10.5.121.203
231	10.5.121.204/31	10.5.121.204 – 10.5.121.205	10.5.121.205
232	10.5.121.206/31	10.5.121.206 – 10.5.121.207	10.5.121.207
233	10.5.121.208/31	10.5.121.208 – 10.5.121.209	10.5.121.209
234	10.5.121.210/31	10.5.121.210 – 10.5.121.211	10.5.121.211
235	10.5.121.212/31	10.5.121.212 – 10.5.121.213	10.5.121.213
236	10.5.121.214/31	10.5.121.214 – 10.5.121.215	10.5.121.215
237	10.5.121.216/31	10.5.121.216 – 10.5.121.217	10.5.121.217
238	10.5.121.218/31	10.5.121.218 – 10.5.121.219	10.5.121.219
239	10.5.121.220/31	10.5.121.220 – 10.5.121.221	10.5.121.221
240	10.5.121.222/31	10.5.121.222 – 10.5.121.223	10.5.121.223
241	10.5.121.224/31	10.5.121.224 – 10.5.121.225	10.5.121.225
242	10.5.121.226/31	10.5.121.226 – 10.5.121.227	10.5.121.227
243	10.5.121.228/31	10.5.121.228 – 10.5.121.229	10.5.121.229
244	10.5.121.230/31	10.5.121.230 – 10.5.121.231	10.5.121.231
245	10.5.121.232/31	10.5.121.232 – 10.5.121.233	10.5.121.233
246	10.5.121.234/31	10.5.121.234 – 10.5.121.235	10.5.121.235
247	10.5.121.236/31	10.5.121.236 – 10.5.121.237	10.5.121.237
248	10.5.121.238/31	10.5.121.238 – 10.5.121.239	10.5.121.239
249	10.5.121.240/31	10.5.121.240 – 10.5.121.241	10.5.121.241
250	10.5.121.242/31	10.5.121.242 – 10.5.121.243	10.5.121.243
251	10.5.121.244/31	10.5.121.244 – 10.5.121.245	10.5.121.245
252	10.5.121.246/31	10.5.121.246 – 10.5.121.247	10.5.121.247
253	10.5.121.248/31	10.5.121.248 – 10.5.121.249	10.5.121.249
254	10.5.121.250/31	10.5.121.250 – 10.5.121.251	10.5.121.251
255	10.5.121.252/31	10.5.121.252 – 10.5.121.253	10.5.121.253
256	10.5.121.254/31	10.5.121.254 – 10.5.121.255	10.5.121.255

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 →