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)10.19.78.0/23

network10.19.78.0/23

broadcast10.19.79.255

first host10.19.78.1

last host10.19.79.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.19.78.0/23

address00001010.00010011.01001110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00010011.01001110.00000000

broadcast00001010.00010011.01001111.11111111

green = network part, grey = host part

hex0x0a134e00

decimal169037312

reverse dns0.78.19.10.in-addr.arpa

ipv4-mapped::ffff:a13:4e00

/23 split into /32 · 512 subnets

close ×

#	network	host range	broadcast
1	10.19.78.0/32	10.19.78.0 – 10.19.78.0	10.19.78.0
2	10.19.78.1/32	10.19.78.1 – 10.19.78.1	10.19.78.1
3	10.19.78.2/32	10.19.78.2 – 10.19.78.2	10.19.78.2
4	10.19.78.3/32	10.19.78.3 – 10.19.78.3	10.19.78.3
5	10.19.78.4/32	10.19.78.4 – 10.19.78.4	10.19.78.4
6	10.19.78.5/32	10.19.78.5 – 10.19.78.5	10.19.78.5
7	10.19.78.6/32	10.19.78.6 – 10.19.78.6	10.19.78.6
8	10.19.78.7/32	10.19.78.7 – 10.19.78.7	10.19.78.7
9	10.19.78.8/32	10.19.78.8 – 10.19.78.8	10.19.78.8
10	10.19.78.9/32	10.19.78.9 – 10.19.78.9	10.19.78.9
11	10.19.78.10/32	10.19.78.10 – 10.19.78.10	10.19.78.10
12	10.19.78.11/32	10.19.78.11 – 10.19.78.11	10.19.78.11
13	10.19.78.12/32	10.19.78.12 – 10.19.78.12	10.19.78.12
14	10.19.78.13/32	10.19.78.13 – 10.19.78.13	10.19.78.13
15	10.19.78.14/32	10.19.78.14 – 10.19.78.14	10.19.78.14
16	10.19.78.15/32	10.19.78.15 – 10.19.78.15	10.19.78.15
17	10.19.78.16/32	10.19.78.16 – 10.19.78.16	10.19.78.16
18	10.19.78.17/32	10.19.78.17 – 10.19.78.17	10.19.78.17
19	10.19.78.18/32	10.19.78.18 – 10.19.78.18	10.19.78.18
20	10.19.78.19/32	10.19.78.19 – 10.19.78.19	10.19.78.19
21	10.19.78.20/32	10.19.78.20 – 10.19.78.20	10.19.78.20
22	10.19.78.21/32	10.19.78.21 – 10.19.78.21	10.19.78.21
23	10.19.78.22/32	10.19.78.22 – 10.19.78.22	10.19.78.22
24	10.19.78.23/32	10.19.78.23 – 10.19.78.23	10.19.78.23
25	10.19.78.24/32	10.19.78.24 – 10.19.78.24	10.19.78.24
26	10.19.78.25/32	10.19.78.25 – 10.19.78.25	10.19.78.25
27	10.19.78.26/32	10.19.78.26 – 10.19.78.26	10.19.78.26
28	10.19.78.27/32	10.19.78.27 – 10.19.78.27	10.19.78.27
29	10.19.78.28/32	10.19.78.28 – 10.19.78.28	10.19.78.28
30	10.19.78.29/32	10.19.78.29 – 10.19.78.29	10.19.78.29
31	10.19.78.30/32	10.19.78.30 – 10.19.78.30	10.19.78.30
32	10.19.78.31/32	10.19.78.31 – 10.19.78.31	10.19.78.31
33	10.19.78.32/32	10.19.78.32 – 10.19.78.32	10.19.78.32
34	10.19.78.33/32	10.19.78.33 – 10.19.78.33	10.19.78.33
35	10.19.78.34/32	10.19.78.34 – 10.19.78.34	10.19.78.34
36	10.19.78.35/32	10.19.78.35 – 10.19.78.35	10.19.78.35
37	10.19.78.36/32	10.19.78.36 – 10.19.78.36	10.19.78.36
38	10.19.78.37/32	10.19.78.37 – 10.19.78.37	10.19.78.37
39	10.19.78.38/32	10.19.78.38 – 10.19.78.38	10.19.78.38
40	10.19.78.39/32	10.19.78.39 – 10.19.78.39	10.19.78.39
41	10.19.78.40/32	10.19.78.40 – 10.19.78.40	10.19.78.40
42	10.19.78.41/32	10.19.78.41 – 10.19.78.41	10.19.78.41
43	10.19.78.42/32	10.19.78.42 – 10.19.78.42	10.19.78.42
44	10.19.78.43/32	10.19.78.43 – 10.19.78.43	10.19.78.43
45	10.19.78.44/32	10.19.78.44 – 10.19.78.44	10.19.78.44
46	10.19.78.45/32	10.19.78.45 – 10.19.78.45	10.19.78.45
47	10.19.78.46/32	10.19.78.46 – 10.19.78.46	10.19.78.46
48	10.19.78.47/32	10.19.78.47 – 10.19.78.47	10.19.78.47
49	10.19.78.48/32	10.19.78.48 – 10.19.78.48	10.19.78.48
50	10.19.78.49/32	10.19.78.49 – 10.19.78.49	10.19.78.49
51	10.19.78.50/32	10.19.78.50 – 10.19.78.50	10.19.78.50
52	10.19.78.51/32	10.19.78.51 – 10.19.78.51	10.19.78.51
53	10.19.78.52/32	10.19.78.52 – 10.19.78.52	10.19.78.52
54	10.19.78.53/32	10.19.78.53 – 10.19.78.53	10.19.78.53
55	10.19.78.54/32	10.19.78.54 – 10.19.78.54	10.19.78.54
56	10.19.78.55/32	10.19.78.55 – 10.19.78.55	10.19.78.55
57	10.19.78.56/32	10.19.78.56 – 10.19.78.56	10.19.78.56
58	10.19.78.57/32	10.19.78.57 – 10.19.78.57	10.19.78.57
59	10.19.78.58/32	10.19.78.58 – 10.19.78.58	10.19.78.58
60	10.19.78.59/32	10.19.78.59 – 10.19.78.59	10.19.78.59
61	10.19.78.60/32	10.19.78.60 – 10.19.78.60	10.19.78.60
62	10.19.78.61/32	10.19.78.61 – 10.19.78.61	10.19.78.61
63	10.19.78.62/32	10.19.78.62 – 10.19.78.62	10.19.78.62
64	10.19.78.63/32	10.19.78.63 – 10.19.78.63	10.19.78.63
65	10.19.78.64/32	10.19.78.64 – 10.19.78.64	10.19.78.64
66	10.19.78.65/32	10.19.78.65 – 10.19.78.65	10.19.78.65
67	10.19.78.66/32	10.19.78.66 – 10.19.78.66	10.19.78.66
68	10.19.78.67/32	10.19.78.67 – 10.19.78.67	10.19.78.67
69	10.19.78.68/32	10.19.78.68 – 10.19.78.68	10.19.78.68
70	10.19.78.69/32	10.19.78.69 – 10.19.78.69	10.19.78.69
71	10.19.78.70/32	10.19.78.70 – 10.19.78.70	10.19.78.70
72	10.19.78.71/32	10.19.78.71 – 10.19.78.71	10.19.78.71
73	10.19.78.72/32	10.19.78.72 – 10.19.78.72	10.19.78.72
74	10.19.78.73/32	10.19.78.73 – 10.19.78.73	10.19.78.73
75	10.19.78.74/32	10.19.78.74 – 10.19.78.74	10.19.78.74
76	10.19.78.75/32	10.19.78.75 – 10.19.78.75	10.19.78.75
77	10.19.78.76/32	10.19.78.76 – 10.19.78.76	10.19.78.76
78	10.19.78.77/32	10.19.78.77 – 10.19.78.77	10.19.78.77
79	10.19.78.78/32	10.19.78.78 – 10.19.78.78	10.19.78.78
80	10.19.78.79/32	10.19.78.79 – 10.19.78.79	10.19.78.79
81	10.19.78.80/32	10.19.78.80 – 10.19.78.80	10.19.78.80
82	10.19.78.81/32	10.19.78.81 – 10.19.78.81	10.19.78.81
83	10.19.78.82/32	10.19.78.82 – 10.19.78.82	10.19.78.82
84	10.19.78.83/32	10.19.78.83 – 10.19.78.83	10.19.78.83
85	10.19.78.84/32	10.19.78.84 – 10.19.78.84	10.19.78.84
86	10.19.78.85/32	10.19.78.85 – 10.19.78.85	10.19.78.85
87	10.19.78.86/32	10.19.78.86 – 10.19.78.86	10.19.78.86
88	10.19.78.87/32	10.19.78.87 – 10.19.78.87	10.19.78.87
89	10.19.78.88/32	10.19.78.88 – 10.19.78.88	10.19.78.88
90	10.19.78.89/32	10.19.78.89 – 10.19.78.89	10.19.78.89
91	10.19.78.90/32	10.19.78.90 – 10.19.78.90	10.19.78.90
92	10.19.78.91/32	10.19.78.91 – 10.19.78.91	10.19.78.91
93	10.19.78.92/32	10.19.78.92 – 10.19.78.92	10.19.78.92
94	10.19.78.93/32	10.19.78.93 – 10.19.78.93	10.19.78.93
95	10.19.78.94/32	10.19.78.94 – 10.19.78.94	10.19.78.94
96	10.19.78.95/32	10.19.78.95 – 10.19.78.95	10.19.78.95
97	10.19.78.96/32	10.19.78.96 – 10.19.78.96	10.19.78.96
98	10.19.78.97/32	10.19.78.97 – 10.19.78.97	10.19.78.97
99	10.19.78.98/32	10.19.78.98 – 10.19.78.98	10.19.78.98
100	10.19.78.99/32	10.19.78.99 – 10.19.78.99	10.19.78.99
101	10.19.78.100/32	10.19.78.100 – 10.19.78.100	10.19.78.100
102	10.19.78.101/32	10.19.78.101 – 10.19.78.101	10.19.78.101
103	10.19.78.102/32	10.19.78.102 – 10.19.78.102	10.19.78.102
104	10.19.78.103/32	10.19.78.103 – 10.19.78.103	10.19.78.103
105	10.19.78.104/32	10.19.78.104 – 10.19.78.104	10.19.78.104
106	10.19.78.105/32	10.19.78.105 – 10.19.78.105	10.19.78.105
107	10.19.78.106/32	10.19.78.106 – 10.19.78.106	10.19.78.106
108	10.19.78.107/32	10.19.78.107 – 10.19.78.107	10.19.78.107
109	10.19.78.108/32	10.19.78.108 – 10.19.78.108	10.19.78.108
110	10.19.78.109/32	10.19.78.109 – 10.19.78.109	10.19.78.109
111	10.19.78.110/32	10.19.78.110 – 10.19.78.110	10.19.78.110
112	10.19.78.111/32	10.19.78.111 – 10.19.78.111	10.19.78.111
113	10.19.78.112/32	10.19.78.112 – 10.19.78.112	10.19.78.112
114	10.19.78.113/32	10.19.78.113 – 10.19.78.113	10.19.78.113
115	10.19.78.114/32	10.19.78.114 – 10.19.78.114	10.19.78.114
116	10.19.78.115/32	10.19.78.115 – 10.19.78.115	10.19.78.115
117	10.19.78.116/32	10.19.78.116 – 10.19.78.116	10.19.78.116
118	10.19.78.117/32	10.19.78.117 – 10.19.78.117	10.19.78.117
119	10.19.78.118/32	10.19.78.118 – 10.19.78.118	10.19.78.118
120	10.19.78.119/32	10.19.78.119 – 10.19.78.119	10.19.78.119
121	10.19.78.120/32	10.19.78.120 – 10.19.78.120	10.19.78.120
122	10.19.78.121/32	10.19.78.121 – 10.19.78.121	10.19.78.121
123	10.19.78.122/32	10.19.78.122 – 10.19.78.122	10.19.78.122
124	10.19.78.123/32	10.19.78.123 – 10.19.78.123	10.19.78.123
125	10.19.78.124/32	10.19.78.124 – 10.19.78.124	10.19.78.124
126	10.19.78.125/32	10.19.78.125 – 10.19.78.125	10.19.78.125
127	10.19.78.126/32	10.19.78.126 – 10.19.78.126	10.19.78.126
128	10.19.78.127/32	10.19.78.127 – 10.19.78.127	10.19.78.127
129	10.19.78.128/32	10.19.78.128 – 10.19.78.128	10.19.78.128
130	10.19.78.129/32	10.19.78.129 – 10.19.78.129	10.19.78.129
131	10.19.78.130/32	10.19.78.130 – 10.19.78.130	10.19.78.130
132	10.19.78.131/32	10.19.78.131 – 10.19.78.131	10.19.78.131
133	10.19.78.132/32	10.19.78.132 – 10.19.78.132	10.19.78.132
134	10.19.78.133/32	10.19.78.133 – 10.19.78.133	10.19.78.133
135	10.19.78.134/32	10.19.78.134 – 10.19.78.134	10.19.78.134
136	10.19.78.135/32	10.19.78.135 – 10.19.78.135	10.19.78.135
137	10.19.78.136/32	10.19.78.136 – 10.19.78.136	10.19.78.136
138	10.19.78.137/32	10.19.78.137 – 10.19.78.137	10.19.78.137
139	10.19.78.138/32	10.19.78.138 – 10.19.78.138	10.19.78.138
140	10.19.78.139/32	10.19.78.139 – 10.19.78.139	10.19.78.139
141	10.19.78.140/32	10.19.78.140 – 10.19.78.140	10.19.78.140
142	10.19.78.141/32	10.19.78.141 – 10.19.78.141	10.19.78.141
143	10.19.78.142/32	10.19.78.142 – 10.19.78.142	10.19.78.142
144	10.19.78.143/32	10.19.78.143 – 10.19.78.143	10.19.78.143
145	10.19.78.144/32	10.19.78.144 – 10.19.78.144	10.19.78.144
146	10.19.78.145/32	10.19.78.145 – 10.19.78.145	10.19.78.145
147	10.19.78.146/32	10.19.78.146 – 10.19.78.146	10.19.78.146
148	10.19.78.147/32	10.19.78.147 – 10.19.78.147	10.19.78.147
149	10.19.78.148/32	10.19.78.148 – 10.19.78.148	10.19.78.148
150	10.19.78.149/32	10.19.78.149 – 10.19.78.149	10.19.78.149
151	10.19.78.150/32	10.19.78.150 – 10.19.78.150	10.19.78.150
152	10.19.78.151/32	10.19.78.151 – 10.19.78.151	10.19.78.151
153	10.19.78.152/32	10.19.78.152 – 10.19.78.152	10.19.78.152
154	10.19.78.153/32	10.19.78.153 – 10.19.78.153	10.19.78.153
155	10.19.78.154/32	10.19.78.154 – 10.19.78.154	10.19.78.154
156	10.19.78.155/32	10.19.78.155 – 10.19.78.155	10.19.78.155
157	10.19.78.156/32	10.19.78.156 – 10.19.78.156	10.19.78.156
158	10.19.78.157/32	10.19.78.157 – 10.19.78.157	10.19.78.157
159	10.19.78.158/32	10.19.78.158 – 10.19.78.158	10.19.78.158
160	10.19.78.159/32	10.19.78.159 – 10.19.78.159	10.19.78.159
161	10.19.78.160/32	10.19.78.160 – 10.19.78.160	10.19.78.160
162	10.19.78.161/32	10.19.78.161 – 10.19.78.161	10.19.78.161
163	10.19.78.162/32	10.19.78.162 – 10.19.78.162	10.19.78.162
164	10.19.78.163/32	10.19.78.163 – 10.19.78.163	10.19.78.163
165	10.19.78.164/32	10.19.78.164 – 10.19.78.164	10.19.78.164
166	10.19.78.165/32	10.19.78.165 – 10.19.78.165	10.19.78.165
167	10.19.78.166/32	10.19.78.166 – 10.19.78.166	10.19.78.166
168	10.19.78.167/32	10.19.78.167 – 10.19.78.167	10.19.78.167
169	10.19.78.168/32	10.19.78.168 – 10.19.78.168	10.19.78.168
170	10.19.78.169/32	10.19.78.169 – 10.19.78.169	10.19.78.169
171	10.19.78.170/32	10.19.78.170 – 10.19.78.170	10.19.78.170
172	10.19.78.171/32	10.19.78.171 – 10.19.78.171	10.19.78.171
173	10.19.78.172/32	10.19.78.172 – 10.19.78.172	10.19.78.172
174	10.19.78.173/32	10.19.78.173 – 10.19.78.173	10.19.78.173
175	10.19.78.174/32	10.19.78.174 – 10.19.78.174	10.19.78.174
176	10.19.78.175/32	10.19.78.175 – 10.19.78.175	10.19.78.175
177	10.19.78.176/32	10.19.78.176 – 10.19.78.176	10.19.78.176
178	10.19.78.177/32	10.19.78.177 – 10.19.78.177	10.19.78.177
179	10.19.78.178/32	10.19.78.178 – 10.19.78.178	10.19.78.178
180	10.19.78.179/32	10.19.78.179 – 10.19.78.179	10.19.78.179
181	10.19.78.180/32	10.19.78.180 – 10.19.78.180	10.19.78.180
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199	10.19.78.198/32	10.19.78.198 – 10.19.78.198	10.19.78.198
200	10.19.78.199/32	10.19.78.199 – 10.19.78.199	10.19.78.199
201	10.19.78.200/32	10.19.78.200 – 10.19.78.200	10.19.78.200
202	10.19.78.201/32	10.19.78.201 – 10.19.78.201	10.19.78.201
203	10.19.78.202/32	10.19.78.202 – 10.19.78.202	10.19.78.202
204	10.19.78.203/32	10.19.78.203 – 10.19.78.203	10.19.78.203
205	10.19.78.204/32	10.19.78.204 – 10.19.78.204	10.19.78.204
206	10.19.78.205/32	10.19.78.205 – 10.19.78.205	10.19.78.205
207	10.19.78.206/32	10.19.78.206 – 10.19.78.206	10.19.78.206
208	10.19.78.207/32	10.19.78.207 – 10.19.78.207	10.19.78.207
209	10.19.78.208/32	10.19.78.208 – 10.19.78.208	10.19.78.208
210	10.19.78.209/32	10.19.78.209 – 10.19.78.209	10.19.78.209
211	10.19.78.210/32	10.19.78.210 – 10.19.78.210	10.19.78.210
212	10.19.78.211/32	10.19.78.211 – 10.19.78.211	10.19.78.211
213	10.19.78.212/32	10.19.78.212 – 10.19.78.212	10.19.78.212
214	10.19.78.213/32	10.19.78.213 – 10.19.78.213	10.19.78.213
215	10.19.78.214/32	10.19.78.214 – 10.19.78.214	10.19.78.214
216	10.19.78.215/32	10.19.78.215 – 10.19.78.215	10.19.78.215
217	10.19.78.216/32	10.19.78.216 – 10.19.78.216	10.19.78.216
218	10.19.78.217/32	10.19.78.217 – 10.19.78.217	10.19.78.217
219	10.19.78.218/32	10.19.78.218 – 10.19.78.218	10.19.78.218
220	10.19.78.219/32	10.19.78.219 – 10.19.78.219	10.19.78.219
221	10.19.78.220/32	10.19.78.220 – 10.19.78.220	10.19.78.220
222	10.19.78.221/32	10.19.78.221 – 10.19.78.221	10.19.78.221
223	10.19.78.222/32	10.19.78.222 – 10.19.78.222	10.19.78.222
224	10.19.78.223/32	10.19.78.223 – 10.19.78.223	10.19.78.223
225	10.19.78.224/32	10.19.78.224 – 10.19.78.224	10.19.78.224
226	10.19.78.225/32	10.19.78.225 – 10.19.78.225	10.19.78.225
227	10.19.78.226/32	10.19.78.226 – 10.19.78.226	10.19.78.226
228	10.19.78.227/32	10.19.78.227 – 10.19.78.227	10.19.78.227
229	10.19.78.228/32	10.19.78.228 – 10.19.78.228	10.19.78.228
230	10.19.78.229/32	10.19.78.229 – 10.19.78.229	10.19.78.229
231	10.19.78.230/32	10.19.78.230 – 10.19.78.230	10.19.78.230
232	10.19.78.231/32	10.19.78.231 – 10.19.78.231	10.19.78.231
233	10.19.78.232/32	10.19.78.232 – 10.19.78.232	10.19.78.232
234	10.19.78.233/32	10.19.78.233 – 10.19.78.233	10.19.78.233
235	10.19.78.234/32	10.19.78.234 – 10.19.78.234	10.19.78.234
236	10.19.78.235/32	10.19.78.235 – 10.19.78.235	10.19.78.235
237	10.19.78.236/32	10.19.78.236 – 10.19.78.236	10.19.78.236
238	10.19.78.237/32	10.19.78.237 – 10.19.78.237	10.19.78.237
239	10.19.78.238/32	10.19.78.238 – 10.19.78.238	10.19.78.238
240	10.19.78.239/32	10.19.78.239 – 10.19.78.239	10.19.78.239
241	10.19.78.240/32	10.19.78.240 – 10.19.78.240	10.19.78.240
242	10.19.78.241/32	10.19.78.241 – 10.19.78.241	10.19.78.241
243	10.19.78.242/32	10.19.78.242 – 10.19.78.242	10.19.78.242
244	10.19.78.243/32	10.19.78.243 – 10.19.78.243	10.19.78.243
245	10.19.78.244/32	10.19.78.244 – 10.19.78.244	10.19.78.244
246	10.19.78.245/32	10.19.78.245 – 10.19.78.245	10.19.78.245
247	10.19.78.246/32	10.19.78.246 – 10.19.78.246	10.19.78.246
248	10.19.78.247/32	10.19.78.247 – 10.19.78.247	10.19.78.247
249	10.19.78.248/32	10.19.78.248 – 10.19.78.248	10.19.78.248
250	10.19.78.249/32	10.19.78.249 – 10.19.78.249	10.19.78.249
251	10.19.78.250/32	10.19.78.250 – 10.19.78.250	10.19.78.250
252	10.19.78.251/32	10.19.78.251 – 10.19.78.251	10.19.78.251
253	10.19.78.252/32	10.19.78.252 – 10.19.78.252	10.19.78.252
254	10.19.78.253/32	10.19.78.253 – 10.19.78.253	10.19.78.253
255	10.19.78.254/32	10.19.78.254 – 10.19.78.254	10.19.78.254
256	10.19.78.255/32	10.19.78.255 – 10.19.78.255	10.19.78.255

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 /23
/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	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →