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)10.2.24.0/21

network10.2.24.0/21

broadcast10.2.31.255

first host10.2.24.1

last host10.2.31.254

subnet mask255.255.248.0

wildcard0.0.7.255

addresses2,048

usable hosts2,046

classA

ipcalc 10.2.24.0/21

address00001010.00000010.00011000.00000000

subnet mask11111111.11111111.11111000.00000000

network00001010.00000010.00011000.00000000

broadcast00001010.00000010.00011111.11111111

green = network part, grey = host part

hex0x0a021800

decimal167909376

reverse dns0.24.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:1800

/21 split into /30 · 512 subnets

close ×

#	network	host range	broadcast
1	10.2.24.0/30	10.2.24.1 – 10.2.24.2	10.2.24.3
2	10.2.24.4/30	10.2.24.5 – 10.2.24.6	10.2.24.7
3	10.2.24.8/30	10.2.24.9 – 10.2.24.10	10.2.24.11
4	10.2.24.12/30	10.2.24.13 – 10.2.24.14	10.2.24.15
5	10.2.24.16/30	10.2.24.17 – 10.2.24.18	10.2.24.19
6	10.2.24.20/30	10.2.24.21 – 10.2.24.22	10.2.24.23
7	10.2.24.24/30	10.2.24.25 – 10.2.24.26	10.2.24.27
8	10.2.24.28/30	10.2.24.29 – 10.2.24.30	10.2.24.31
9	10.2.24.32/30	10.2.24.33 – 10.2.24.34	10.2.24.35
10	10.2.24.36/30	10.2.24.37 – 10.2.24.38	10.2.24.39
11	10.2.24.40/30	10.2.24.41 – 10.2.24.42	10.2.24.43
12	10.2.24.44/30	10.2.24.45 – 10.2.24.46	10.2.24.47
13	10.2.24.48/30	10.2.24.49 – 10.2.24.50	10.2.24.51
14	10.2.24.52/30	10.2.24.53 – 10.2.24.54	10.2.24.55
15	10.2.24.56/30	10.2.24.57 – 10.2.24.58	10.2.24.59
16	10.2.24.60/30	10.2.24.61 – 10.2.24.62	10.2.24.63
17	10.2.24.64/30	10.2.24.65 – 10.2.24.66	10.2.24.67
18	10.2.24.68/30	10.2.24.69 – 10.2.24.70	10.2.24.71
19	10.2.24.72/30	10.2.24.73 – 10.2.24.74	10.2.24.75
20	10.2.24.76/30	10.2.24.77 – 10.2.24.78	10.2.24.79
21	10.2.24.80/30	10.2.24.81 – 10.2.24.82	10.2.24.83
22	10.2.24.84/30	10.2.24.85 – 10.2.24.86	10.2.24.87
23	10.2.24.88/30	10.2.24.89 – 10.2.24.90	10.2.24.91
24	10.2.24.92/30	10.2.24.93 – 10.2.24.94	10.2.24.95
25	10.2.24.96/30	10.2.24.97 – 10.2.24.98	10.2.24.99
26	10.2.24.100/30	10.2.24.101 – 10.2.24.102	10.2.24.103
27	10.2.24.104/30	10.2.24.105 – 10.2.24.106	10.2.24.107
28	10.2.24.108/30	10.2.24.109 – 10.2.24.110	10.2.24.111
29	10.2.24.112/30	10.2.24.113 – 10.2.24.114	10.2.24.115
30	10.2.24.116/30	10.2.24.117 – 10.2.24.118	10.2.24.119
31	10.2.24.120/30	10.2.24.121 – 10.2.24.122	10.2.24.123
32	10.2.24.124/30	10.2.24.125 – 10.2.24.126	10.2.24.127
33	10.2.24.128/30	10.2.24.129 – 10.2.24.130	10.2.24.131
34	10.2.24.132/30	10.2.24.133 – 10.2.24.134	10.2.24.135
35	10.2.24.136/30	10.2.24.137 – 10.2.24.138	10.2.24.139
36	10.2.24.140/30	10.2.24.141 – 10.2.24.142	10.2.24.143
37	10.2.24.144/30	10.2.24.145 – 10.2.24.146	10.2.24.147
38	10.2.24.148/30	10.2.24.149 – 10.2.24.150	10.2.24.151
39	10.2.24.152/30	10.2.24.153 – 10.2.24.154	10.2.24.155
40	10.2.24.156/30	10.2.24.157 – 10.2.24.158	10.2.24.159
41	10.2.24.160/30	10.2.24.161 – 10.2.24.162	10.2.24.163
42	10.2.24.164/30	10.2.24.165 – 10.2.24.166	10.2.24.167
43	10.2.24.168/30	10.2.24.169 – 10.2.24.170	10.2.24.171
44	10.2.24.172/30	10.2.24.173 – 10.2.24.174	10.2.24.175
45	10.2.24.176/30	10.2.24.177 – 10.2.24.178	10.2.24.179
46	10.2.24.180/30	10.2.24.181 – 10.2.24.182	10.2.24.183
47	10.2.24.184/30	10.2.24.185 – 10.2.24.186	10.2.24.187
48	10.2.24.188/30	10.2.24.189 – 10.2.24.190	10.2.24.191
49	10.2.24.192/30	10.2.24.193 – 10.2.24.194	10.2.24.195
50	10.2.24.196/30	10.2.24.197 – 10.2.24.198	10.2.24.199
51	10.2.24.200/30	10.2.24.201 – 10.2.24.202	10.2.24.203
52	10.2.24.204/30	10.2.24.205 – 10.2.24.206	10.2.24.207
53	10.2.24.208/30	10.2.24.209 – 10.2.24.210	10.2.24.211
54	10.2.24.212/30	10.2.24.213 – 10.2.24.214	10.2.24.215
55	10.2.24.216/30	10.2.24.217 – 10.2.24.218	10.2.24.219
56	10.2.24.220/30	10.2.24.221 – 10.2.24.222	10.2.24.223
57	10.2.24.224/30	10.2.24.225 – 10.2.24.226	10.2.24.227
58	10.2.24.228/30	10.2.24.229 – 10.2.24.230	10.2.24.231
59	10.2.24.232/30	10.2.24.233 – 10.2.24.234	10.2.24.235
60	10.2.24.236/30	10.2.24.237 – 10.2.24.238	10.2.24.239
61	10.2.24.240/30	10.2.24.241 – 10.2.24.242	10.2.24.243
62	10.2.24.244/30	10.2.24.245 – 10.2.24.246	10.2.24.247
63	10.2.24.248/30	10.2.24.249 – 10.2.24.250	10.2.24.251
64	10.2.24.252/30	10.2.24.253 – 10.2.24.254	10.2.24.255
65	10.2.25.0/30	10.2.25.1 – 10.2.25.2	10.2.25.3
66	10.2.25.4/30	10.2.25.5 – 10.2.25.6	10.2.25.7
67	10.2.25.8/30	10.2.25.9 – 10.2.25.10	10.2.25.11
68	10.2.25.12/30	10.2.25.13 – 10.2.25.14	10.2.25.15
69	10.2.25.16/30	10.2.25.17 – 10.2.25.18	10.2.25.19
70	10.2.25.20/30	10.2.25.21 – 10.2.25.22	10.2.25.23
71	10.2.25.24/30	10.2.25.25 – 10.2.25.26	10.2.25.27
72	10.2.25.28/30	10.2.25.29 – 10.2.25.30	10.2.25.31
73	10.2.25.32/30	10.2.25.33 – 10.2.25.34	10.2.25.35
74	10.2.25.36/30	10.2.25.37 – 10.2.25.38	10.2.25.39
75	10.2.25.40/30	10.2.25.41 – 10.2.25.42	10.2.25.43
76	10.2.25.44/30	10.2.25.45 – 10.2.25.46	10.2.25.47
77	10.2.25.48/30	10.2.25.49 – 10.2.25.50	10.2.25.51
78	10.2.25.52/30	10.2.25.53 – 10.2.25.54	10.2.25.55
79	10.2.25.56/30	10.2.25.57 – 10.2.25.58	10.2.25.59
80	10.2.25.60/30	10.2.25.61 – 10.2.25.62	10.2.25.63
81	10.2.25.64/30	10.2.25.65 – 10.2.25.66	10.2.25.67
82	10.2.25.68/30	10.2.25.69 – 10.2.25.70	10.2.25.71
83	10.2.25.72/30	10.2.25.73 – 10.2.25.74	10.2.25.75
84	10.2.25.76/30	10.2.25.77 – 10.2.25.78	10.2.25.79
85	10.2.25.80/30	10.2.25.81 – 10.2.25.82	10.2.25.83
86	10.2.25.84/30	10.2.25.85 – 10.2.25.86	10.2.25.87
87	10.2.25.88/30	10.2.25.89 – 10.2.25.90	10.2.25.91
88	10.2.25.92/30	10.2.25.93 – 10.2.25.94	10.2.25.95
89	10.2.25.96/30	10.2.25.97 – 10.2.25.98	10.2.25.99
90	10.2.25.100/30	10.2.25.101 – 10.2.25.102	10.2.25.103
91	10.2.25.104/30	10.2.25.105 – 10.2.25.106	10.2.25.107
92	10.2.25.108/30	10.2.25.109 – 10.2.25.110	10.2.25.111
93	10.2.25.112/30	10.2.25.113 – 10.2.25.114	10.2.25.115
94	10.2.25.116/30	10.2.25.117 – 10.2.25.118	10.2.25.119
95	10.2.25.120/30	10.2.25.121 – 10.2.25.122	10.2.25.123
96	10.2.25.124/30	10.2.25.125 – 10.2.25.126	10.2.25.127
97	10.2.25.128/30	10.2.25.129 – 10.2.25.130	10.2.25.131
98	10.2.25.132/30	10.2.25.133 – 10.2.25.134	10.2.25.135
99	10.2.25.136/30	10.2.25.137 – 10.2.25.138	10.2.25.139
100	10.2.25.140/30	10.2.25.141 – 10.2.25.142	10.2.25.143
101	10.2.25.144/30	10.2.25.145 – 10.2.25.146	10.2.25.147
102	10.2.25.148/30	10.2.25.149 – 10.2.25.150	10.2.25.151
103	10.2.25.152/30	10.2.25.153 – 10.2.25.154	10.2.25.155
104	10.2.25.156/30	10.2.25.157 – 10.2.25.158	10.2.25.159
105	10.2.25.160/30	10.2.25.161 – 10.2.25.162	10.2.25.163
106	10.2.25.164/30	10.2.25.165 – 10.2.25.166	10.2.25.167
107	10.2.25.168/30	10.2.25.169 – 10.2.25.170	10.2.25.171
108	10.2.25.172/30	10.2.25.173 – 10.2.25.174	10.2.25.175
109	10.2.25.176/30	10.2.25.177 – 10.2.25.178	10.2.25.179
110	10.2.25.180/30	10.2.25.181 – 10.2.25.182	10.2.25.183
111	10.2.25.184/30	10.2.25.185 – 10.2.25.186	10.2.25.187
112	10.2.25.188/30	10.2.25.189 – 10.2.25.190	10.2.25.191
113	10.2.25.192/30	10.2.25.193 – 10.2.25.194	10.2.25.195
114	10.2.25.196/30	10.2.25.197 – 10.2.25.198	10.2.25.199
115	10.2.25.200/30	10.2.25.201 – 10.2.25.202	10.2.25.203
116	10.2.25.204/30	10.2.25.205 – 10.2.25.206	10.2.25.207
117	10.2.25.208/30	10.2.25.209 – 10.2.25.210	10.2.25.211
118	10.2.25.212/30	10.2.25.213 – 10.2.25.214	10.2.25.215
119	10.2.25.216/30	10.2.25.217 – 10.2.25.218	10.2.25.219
120	10.2.25.220/30	10.2.25.221 – 10.2.25.222	10.2.25.223
121	10.2.25.224/30	10.2.25.225 – 10.2.25.226	10.2.25.227
122	10.2.25.228/30	10.2.25.229 – 10.2.25.230	10.2.25.231
123	10.2.25.232/30	10.2.25.233 – 10.2.25.234	10.2.25.235
124	10.2.25.236/30	10.2.25.237 – 10.2.25.238	10.2.25.239
125	10.2.25.240/30	10.2.25.241 – 10.2.25.242	10.2.25.243
126	10.2.25.244/30	10.2.25.245 – 10.2.25.246	10.2.25.247
127	10.2.25.248/30	10.2.25.249 – 10.2.25.250	10.2.25.251
128	10.2.25.252/30	10.2.25.253 – 10.2.25.254	10.2.25.255
129	10.2.26.0/30	10.2.26.1 – 10.2.26.2	10.2.26.3
130	10.2.26.4/30	10.2.26.5 – 10.2.26.6	10.2.26.7
131	10.2.26.8/30	10.2.26.9 – 10.2.26.10	10.2.26.11
132	10.2.26.12/30	10.2.26.13 – 10.2.26.14	10.2.26.15
133	10.2.26.16/30	10.2.26.17 – 10.2.26.18	10.2.26.19
134	10.2.26.20/30	10.2.26.21 – 10.2.26.22	10.2.26.23
135	10.2.26.24/30	10.2.26.25 – 10.2.26.26	10.2.26.27
136	10.2.26.28/30	10.2.26.29 – 10.2.26.30	10.2.26.31
137	10.2.26.32/30	10.2.26.33 – 10.2.26.34	10.2.26.35
138	10.2.26.36/30	10.2.26.37 – 10.2.26.38	10.2.26.39
139	10.2.26.40/30	10.2.26.41 – 10.2.26.42	10.2.26.43
140	10.2.26.44/30	10.2.26.45 – 10.2.26.46	10.2.26.47
141	10.2.26.48/30	10.2.26.49 – 10.2.26.50	10.2.26.51
142	10.2.26.52/30	10.2.26.53 – 10.2.26.54	10.2.26.55
143	10.2.26.56/30	10.2.26.57 – 10.2.26.58	10.2.26.59
144	10.2.26.60/30	10.2.26.61 – 10.2.26.62	10.2.26.63
145	10.2.26.64/30	10.2.26.65 – 10.2.26.66	10.2.26.67
146	10.2.26.68/30	10.2.26.69 – 10.2.26.70	10.2.26.71
147	10.2.26.72/30	10.2.26.73 – 10.2.26.74	10.2.26.75
148	10.2.26.76/30	10.2.26.77 – 10.2.26.78	10.2.26.79
149	10.2.26.80/30	10.2.26.81 – 10.2.26.82	10.2.26.83
150	10.2.26.84/30	10.2.26.85 – 10.2.26.86	10.2.26.87
151	10.2.26.88/30	10.2.26.89 – 10.2.26.90	10.2.26.91
152	10.2.26.92/30	10.2.26.93 – 10.2.26.94	10.2.26.95
153	10.2.26.96/30	10.2.26.97 – 10.2.26.98	10.2.26.99
154	10.2.26.100/30	10.2.26.101 – 10.2.26.102	10.2.26.103
155	10.2.26.104/30	10.2.26.105 – 10.2.26.106	10.2.26.107
156	10.2.26.108/30	10.2.26.109 – 10.2.26.110	10.2.26.111
157	10.2.26.112/30	10.2.26.113 – 10.2.26.114	10.2.26.115
158	10.2.26.116/30	10.2.26.117 – 10.2.26.118	10.2.26.119
159	10.2.26.120/30	10.2.26.121 – 10.2.26.122	10.2.26.123
160	10.2.26.124/30	10.2.26.125 – 10.2.26.126	10.2.26.127
161	10.2.26.128/30	10.2.26.129 – 10.2.26.130	10.2.26.131
162	10.2.26.132/30	10.2.26.133 – 10.2.26.134	10.2.26.135
163	10.2.26.136/30	10.2.26.137 – 10.2.26.138	10.2.26.139
164	10.2.26.140/30	10.2.26.141 – 10.2.26.142	10.2.26.143
165	10.2.26.144/30	10.2.26.145 – 10.2.26.146	10.2.26.147
166	10.2.26.148/30	10.2.26.149 – 10.2.26.150	10.2.26.151
167	10.2.26.152/30	10.2.26.153 – 10.2.26.154	10.2.26.155
168	10.2.26.156/30	10.2.26.157 – 10.2.26.158	10.2.26.159
169	10.2.26.160/30	10.2.26.161 – 10.2.26.162	10.2.26.163
170	10.2.26.164/30	10.2.26.165 – 10.2.26.166	10.2.26.167
171	10.2.26.168/30	10.2.26.169 – 10.2.26.170	10.2.26.171
172	10.2.26.172/30	10.2.26.173 – 10.2.26.174	10.2.26.175
173	10.2.26.176/30	10.2.26.177 – 10.2.26.178	10.2.26.179
174	10.2.26.180/30	10.2.26.181 – 10.2.26.182	10.2.26.183
175	10.2.26.184/30	10.2.26.185 – 10.2.26.186	10.2.26.187
176	10.2.26.188/30	10.2.26.189 – 10.2.26.190	10.2.26.191
177	10.2.26.192/30	10.2.26.193 – 10.2.26.194	10.2.26.195
178	10.2.26.196/30	10.2.26.197 – 10.2.26.198	10.2.26.199
179	10.2.26.200/30	10.2.26.201 – 10.2.26.202	10.2.26.203
180	10.2.26.204/30	10.2.26.205 – 10.2.26.206	10.2.26.207
181	10.2.26.208/30	10.2.26.209 – 10.2.26.210	10.2.26.211
182	10.2.26.212/30	10.2.26.213 – 10.2.26.214	10.2.26.215
183	10.2.26.216/30	10.2.26.217 – 10.2.26.218	10.2.26.219
184	10.2.26.220/30	10.2.26.221 – 10.2.26.222	10.2.26.223
185	10.2.26.224/30	10.2.26.225 – 10.2.26.226	10.2.26.227
186	10.2.26.228/30	10.2.26.229 – 10.2.26.230	10.2.26.231
187	10.2.26.232/30	10.2.26.233 – 10.2.26.234	10.2.26.235
188	10.2.26.236/30	10.2.26.237 – 10.2.26.238	10.2.26.239
189	10.2.26.240/30	10.2.26.241 – 10.2.26.242	10.2.26.243
190	10.2.26.244/30	10.2.26.245 – 10.2.26.246	10.2.26.247
191	10.2.26.248/30	10.2.26.249 – 10.2.26.250	10.2.26.251
192	10.2.26.252/30	10.2.26.253 – 10.2.26.254	10.2.26.255
193	10.2.27.0/30	10.2.27.1 – 10.2.27.2	10.2.27.3
194	10.2.27.4/30	10.2.27.5 – 10.2.27.6	10.2.27.7
195	10.2.27.8/30	10.2.27.9 – 10.2.27.10	10.2.27.11
196	10.2.27.12/30	10.2.27.13 – 10.2.27.14	10.2.27.15
197	10.2.27.16/30	10.2.27.17 – 10.2.27.18	10.2.27.19
198	10.2.27.20/30	10.2.27.21 – 10.2.27.22	10.2.27.23
199	10.2.27.24/30	10.2.27.25 – 10.2.27.26	10.2.27.27
200	10.2.27.28/30	10.2.27.29 – 10.2.27.30	10.2.27.31
201	10.2.27.32/30	10.2.27.33 – 10.2.27.34	10.2.27.35
202	10.2.27.36/30	10.2.27.37 – 10.2.27.38	10.2.27.39
203	10.2.27.40/30	10.2.27.41 – 10.2.27.42	10.2.27.43
204	10.2.27.44/30	10.2.27.45 – 10.2.27.46	10.2.27.47
205	10.2.27.48/30	10.2.27.49 – 10.2.27.50	10.2.27.51
206	10.2.27.52/30	10.2.27.53 – 10.2.27.54	10.2.27.55
207	10.2.27.56/30	10.2.27.57 – 10.2.27.58	10.2.27.59
208	10.2.27.60/30	10.2.27.61 – 10.2.27.62	10.2.27.63
209	10.2.27.64/30	10.2.27.65 – 10.2.27.66	10.2.27.67
210	10.2.27.68/30	10.2.27.69 – 10.2.27.70	10.2.27.71
211	10.2.27.72/30	10.2.27.73 – 10.2.27.74	10.2.27.75
212	10.2.27.76/30	10.2.27.77 – 10.2.27.78	10.2.27.79
213	10.2.27.80/30	10.2.27.81 – 10.2.27.82	10.2.27.83
214	10.2.27.84/30	10.2.27.85 – 10.2.27.86	10.2.27.87
215	10.2.27.88/30	10.2.27.89 – 10.2.27.90	10.2.27.91
216	10.2.27.92/30	10.2.27.93 – 10.2.27.94	10.2.27.95
217	10.2.27.96/30	10.2.27.97 – 10.2.27.98	10.2.27.99
218	10.2.27.100/30	10.2.27.101 – 10.2.27.102	10.2.27.103
219	10.2.27.104/30	10.2.27.105 – 10.2.27.106	10.2.27.107
220	10.2.27.108/30	10.2.27.109 – 10.2.27.110	10.2.27.111
221	10.2.27.112/30	10.2.27.113 – 10.2.27.114	10.2.27.115
222	10.2.27.116/30	10.2.27.117 – 10.2.27.118	10.2.27.119
223	10.2.27.120/30	10.2.27.121 – 10.2.27.122	10.2.27.123
224	10.2.27.124/30	10.2.27.125 – 10.2.27.126	10.2.27.127
225	10.2.27.128/30	10.2.27.129 – 10.2.27.130	10.2.27.131
226	10.2.27.132/30	10.2.27.133 – 10.2.27.134	10.2.27.135
227	10.2.27.136/30	10.2.27.137 – 10.2.27.138	10.2.27.139
228	10.2.27.140/30	10.2.27.141 – 10.2.27.142	10.2.27.143
229	10.2.27.144/30	10.2.27.145 – 10.2.27.146	10.2.27.147
230	10.2.27.148/30	10.2.27.149 – 10.2.27.150	10.2.27.151
231	10.2.27.152/30	10.2.27.153 – 10.2.27.154	10.2.27.155
232	10.2.27.156/30	10.2.27.157 – 10.2.27.158	10.2.27.159
233	10.2.27.160/30	10.2.27.161 – 10.2.27.162	10.2.27.163
234	10.2.27.164/30	10.2.27.165 – 10.2.27.166	10.2.27.167
235	10.2.27.168/30	10.2.27.169 – 10.2.27.170	10.2.27.171
236	10.2.27.172/30	10.2.27.173 – 10.2.27.174	10.2.27.175
237	10.2.27.176/30	10.2.27.177 – 10.2.27.178	10.2.27.179
238	10.2.27.180/30	10.2.27.181 – 10.2.27.182	10.2.27.183
239	10.2.27.184/30	10.2.27.185 – 10.2.27.186	10.2.27.187
240	10.2.27.188/30	10.2.27.189 – 10.2.27.190	10.2.27.191
241	10.2.27.192/30	10.2.27.193 – 10.2.27.194	10.2.27.195
242	10.2.27.196/30	10.2.27.197 – 10.2.27.198	10.2.27.199
243	10.2.27.200/30	10.2.27.201 – 10.2.27.202	10.2.27.203
244	10.2.27.204/30	10.2.27.205 – 10.2.27.206	10.2.27.207
245	10.2.27.208/30	10.2.27.209 – 10.2.27.210	10.2.27.211
246	10.2.27.212/30	10.2.27.213 – 10.2.27.214	10.2.27.215
247	10.2.27.216/30	10.2.27.217 – 10.2.27.218	10.2.27.219
248	10.2.27.220/30	10.2.27.221 – 10.2.27.222	10.2.27.223
249	10.2.27.224/30	10.2.27.225 – 10.2.27.226	10.2.27.227
250	10.2.27.228/30	10.2.27.229 – 10.2.27.230	10.2.27.231
251	10.2.27.232/30	10.2.27.233 – 10.2.27.234	10.2.27.235
252	10.2.27.236/30	10.2.27.237 – 10.2.27.238	10.2.27.239
253	10.2.27.240/30	10.2.27.241 – 10.2.27.242	10.2.27.243
254	10.2.27.244/30	10.2.27.245 – 10.2.27.246	10.2.27.247
255	10.2.27.248/30	10.2.27.249 – 10.2.27.250	10.2.27.251
256	10.2.27.252/30	10.2.27.253 – 10.2.27.254	10.2.27.255

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 →