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)10.0.249.0/24

network10.0.249.0/24

broadcast10.0.249.255

first host10.0.249.1

last host10.0.249.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.249.0/24

address00001010.00000000.11111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11111001.00000000

broadcast00001010.00000000.11111001.11111111

green = network part, grey = host part

hex0x0a00f900

decimal167835904

reverse dns0.249.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:f900

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.0.249.0/32	10.0.249.0 – 10.0.249.0	10.0.249.0
2	10.0.249.1/32	10.0.249.1 – 10.0.249.1	10.0.249.1
3	10.0.249.2/32	10.0.249.2 – 10.0.249.2	10.0.249.2
4	10.0.249.3/32	10.0.249.3 – 10.0.249.3	10.0.249.3
5	10.0.249.4/32	10.0.249.4 – 10.0.249.4	10.0.249.4
6	10.0.249.5/32	10.0.249.5 – 10.0.249.5	10.0.249.5
7	10.0.249.6/32	10.0.249.6 – 10.0.249.6	10.0.249.6
8	10.0.249.7/32	10.0.249.7 – 10.0.249.7	10.0.249.7
9	10.0.249.8/32	10.0.249.8 – 10.0.249.8	10.0.249.8
10	10.0.249.9/32	10.0.249.9 – 10.0.249.9	10.0.249.9
11	10.0.249.10/32	10.0.249.10 – 10.0.249.10	10.0.249.10
12	10.0.249.11/32	10.0.249.11 – 10.0.249.11	10.0.249.11
13	10.0.249.12/32	10.0.249.12 – 10.0.249.12	10.0.249.12
14	10.0.249.13/32	10.0.249.13 – 10.0.249.13	10.0.249.13
15	10.0.249.14/32	10.0.249.14 – 10.0.249.14	10.0.249.14
16	10.0.249.15/32	10.0.249.15 – 10.0.249.15	10.0.249.15
17	10.0.249.16/32	10.0.249.16 – 10.0.249.16	10.0.249.16
18	10.0.249.17/32	10.0.249.17 – 10.0.249.17	10.0.249.17
19	10.0.249.18/32	10.0.249.18 – 10.0.249.18	10.0.249.18
20	10.0.249.19/32	10.0.249.19 – 10.0.249.19	10.0.249.19
21	10.0.249.20/32	10.0.249.20 – 10.0.249.20	10.0.249.20
22	10.0.249.21/32	10.0.249.21 – 10.0.249.21	10.0.249.21
23	10.0.249.22/32	10.0.249.22 – 10.0.249.22	10.0.249.22
24	10.0.249.23/32	10.0.249.23 – 10.0.249.23	10.0.249.23
25	10.0.249.24/32	10.0.249.24 – 10.0.249.24	10.0.249.24
26	10.0.249.25/32	10.0.249.25 – 10.0.249.25	10.0.249.25
27	10.0.249.26/32	10.0.249.26 – 10.0.249.26	10.0.249.26
28	10.0.249.27/32	10.0.249.27 – 10.0.249.27	10.0.249.27
29	10.0.249.28/32	10.0.249.28 – 10.0.249.28	10.0.249.28
30	10.0.249.29/32	10.0.249.29 – 10.0.249.29	10.0.249.29
31	10.0.249.30/32	10.0.249.30 – 10.0.249.30	10.0.249.30
32	10.0.249.31/32	10.0.249.31 – 10.0.249.31	10.0.249.31
33	10.0.249.32/32	10.0.249.32 – 10.0.249.32	10.0.249.32
34	10.0.249.33/32	10.0.249.33 – 10.0.249.33	10.0.249.33
35	10.0.249.34/32	10.0.249.34 – 10.0.249.34	10.0.249.34
36	10.0.249.35/32	10.0.249.35 – 10.0.249.35	10.0.249.35
37	10.0.249.36/32	10.0.249.36 – 10.0.249.36	10.0.249.36
38	10.0.249.37/32	10.0.249.37 – 10.0.249.37	10.0.249.37
39	10.0.249.38/32	10.0.249.38 – 10.0.249.38	10.0.249.38
40	10.0.249.39/32	10.0.249.39 – 10.0.249.39	10.0.249.39
41	10.0.249.40/32	10.0.249.40 – 10.0.249.40	10.0.249.40
42	10.0.249.41/32	10.0.249.41 – 10.0.249.41	10.0.249.41
43	10.0.249.42/32	10.0.249.42 – 10.0.249.42	10.0.249.42
44	10.0.249.43/32	10.0.249.43 – 10.0.249.43	10.0.249.43
45	10.0.249.44/32	10.0.249.44 – 10.0.249.44	10.0.249.44
46	10.0.249.45/32	10.0.249.45 – 10.0.249.45	10.0.249.45
47	10.0.249.46/32	10.0.249.46 – 10.0.249.46	10.0.249.46
48	10.0.249.47/32	10.0.249.47 – 10.0.249.47	10.0.249.47
49	10.0.249.48/32	10.0.249.48 – 10.0.249.48	10.0.249.48
50	10.0.249.49/32	10.0.249.49 – 10.0.249.49	10.0.249.49
51	10.0.249.50/32	10.0.249.50 – 10.0.249.50	10.0.249.50
52	10.0.249.51/32	10.0.249.51 – 10.0.249.51	10.0.249.51
53	10.0.249.52/32	10.0.249.52 – 10.0.249.52	10.0.249.52
54	10.0.249.53/32	10.0.249.53 – 10.0.249.53	10.0.249.53
55	10.0.249.54/32	10.0.249.54 – 10.0.249.54	10.0.249.54
56	10.0.249.55/32	10.0.249.55 – 10.0.249.55	10.0.249.55
57	10.0.249.56/32	10.0.249.56 – 10.0.249.56	10.0.249.56
58	10.0.249.57/32	10.0.249.57 – 10.0.249.57	10.0.249.57
59	10.0.249.58/32	10.0.249.58 – 10.0.249.58	10.0.249.58
60	10.0.249.59/32	10.0.249.59 – 10.0.249.59	10.0.249.59
61	10.0.249.60/32	10.0.249.60 – 10.0.249.60	10.0.249.60
62	10.0.249.61/32	10.0.249.61 – 10.0.249.61	10.0.249.61
63	10.0.249.62/32	10.0.249.62 – 10.0.249.62	10.0.249.62
64	10.0.249.63/32	10.0.249.63 – 10.0.249.63	10.0.249.63
65	10.0.249.64/32	10.0.249.64 – 10.0.249.64	10.0.249.64
66	10.0.249.65/32	10.0.249.65 – 10.0.249.65	10.0.249.65
67	10.0.249.66/32	10.0.249.66 – 10.0.249.66	10.0.249.66
68	10.0.249.67/32	10.0.249.67 – 10.0.249.67	10.0.249.67
69	10.0.249.68/32	10.0.249.68 – 10.0.249.68	10.0.249.68
70	10.0.249.69/32	10.0.249.69 – 10.0.249.69	10.0.249.69
71	10.0.249.70/32	10.0.249.70 – 10.0.249.70	10.0.249.70
72	10.0.249.71/32	10.0.249.71 – 10.0.249.71	10.0.249.71
73	10.0.249.72/32	10.0.249.72 – 10.0.249.72	10.0.249.72
74	10.0.249.73/32	10.0.249.73 – 10.0.249.73	10.0.249.73
75	10.0.249.74/32	10.0.249.74 – 10.0.249.74	10.0.249.74
76	10.0.249.75/32	10.0.249.75 – 10.0.249.75	10.0.249.75
77	10.0.249.76/32	10.0.249.76 – 10.0.249.76	10.0.249.76
78	10.0.249.77/32	10.0.249.77 – 10.0.249.77	10.0.249.77
79	10.0.249.78/32	10.0.249.78 – 10.0.249.78	10.0.249.78
80	10.0.249.79/32	10.0.249.79 – 10.0.249.79	10.0.249.79
81	10.0.249.80/32	10.0.249.80 – 10.0.249.80	10.0.249.80
82	10.0.249.81/32	10.0.249.81 – 10.0.249.81	10.0.249.81
83	10.0.249.82/32	10.0.249.82 – 10.0.249.82	10.0.249.82
84	10.0.249.83/32	10.0.249.83 – 10.0.249.83	10.0.249.83
85	10.0.249.84/32	10.0.249.84 – 10.0.249.84	10.0.249.84
86	10.0.249.85/32	10.0.249.85 – 10.0.249.85	10.0.249.85
87	10.0.249.86/32	10.0.249.86 – 10.0.249.86	10.0.249.86
88	10.0.249.87/32	10.0.249.87 – 10.0.249.87	10.0.249.87
89	10.0.249.88/32	10.0.249.88 – 10.0.249.88	10.0.249.88
90	10.0.249.89/32	10.0.249.89 – 10.0.249.89	10.0.249.89
91	10.0.249.90/32	10.0.249.90 – 10.0.249.90	10.0.249.90
92	10.0.249.91/32	10.0.249.91 – 10.0.249.91	10.0.249.91
93	10.0.249.92/32	10.0.249.92 – 10.0.249.92	10.0.249.92
94	10.0.249.93/32	10.0.249.93 – 10.0.249.93	10.0.249.93
95	10.0.249.94/32	10.0.249.94 – 10.0.249.94	10.0.249.94
96	10.0.249.95/32	10.0.249.95 – 10.0.249.95	10.0.249.95
97	10.0.249.96/32	10.0.249.96 – 10.0.249.96	10.0.249.96
98	10.0.249.97/32	10.0.249.97 – 10.0.249.97	10.0.249.97
99	10.0.249.98/32	10.0.249.98 – 10.0.249.98	10.0.249.98
100	10.0.249.99/32	10.0.249.99 – 10.0.249.99	10.0.249.99
101	10.0.249.100/32	10.0.249.100 – 10.0.249.100	10.0.249.100
102	10.0.249.101/32	10.0.249.101 – 10.0.249.101	10.0.249.101
103	10.0.249.102/32	10.0.249.102 – 10.0.249.102	10.0.249.102
104	10.0.249.103/32	10.0.249.103 – 10.0.249.103	10.0.249.103
105	10.0.249.104/32	10.0.249.104 – 10.0.249.104	10.0.249.104
106	10.0.249.105/32	10.0.249.105 – 10.0.249.105	10.0.249.105
107	10.0.249.106/32	10.0.249.106 – 10.0.249.106	10.0.249.106
108	10.0.249.107/32	10.0.249.107 – 10.0.249.107	10.0.249.107
109	10.0.249.108/32	10.0.249.108 – 10.0.249.108	10.0.249.108
110	10.0.249.109/32	10.0.249.109 – 10.0.249.109	10.0.249.109
111	10.0.249.110/32	10.0.249.110 – 10.0.249.110	10.0.249.110
112	10.0.249.111/32	10.0.249.111 – 10.0.249.111	10.0.249.111
113	10.0.249.112/32	10.0.249.112 – 10.0.249.112	10.0.249.112
114	10.0.249.113/32	10.0.249.113 – 10.0.249.113	10.0.249.113
115	10.0.249.114/32	10.0.249.114 – 10.0.249.114	10.0.249.114
116	10.0.249.115/32	10.0.249.115 – 10.0.249.115	10.0.249.115
117	10.0.249.116/32	10.0.249.116 – 10.0.249.116	10.0.249.116
118	10.0.249.117/32	10.0.249.117 – 10.0.249.117	10.0.249.117
119	10.0.249.118/32	10.0.249.118 – 10.0.249.118	10.0.249.118
120	10.0.249.119/32	10.0.249.119 – 10.0.249.119	10.0.249.119
121	10.0.249.120/32	10.0.249.120 – 10.0.249.120	10.0.249.120
122	10.0.249.121/32	10.0.249.121 – 10.0.249.121	10.0.249.121
123	10.0.249.122/32	10.0.249.122 – 10.0.249.122	10.0.249.122
124	10.0.249.123/32	10.0.249.123 – 10.0.249.123	10.0.249.123
125	10.0.249.124/32	10.0.249.124 – 10.0.249.124	10.0.249.124
126	10.0.249.125/32	10.0.249.125 – 10.0.249.125	10.0.249.125
127	10.0.249.126/32	10.0.249.126 – 10.0.249.126	10.0.249.126
128	10.0.249.127/32	10.0.249.127 – 10.0.249.127	10.0.249.127
129	10.0.249.128/32	10.0.249.128 – 10.0.249.128	10.0.249.128
130	10.0.249.129/32	10.0.249.129 – 10.0.249.129	10.0.249.129
131	10.0.249.130/32	10.0.249.130 – 10.0.249.130	10.0.249.130
132	10.0.249.131/32	10.0.249.131 – 10.0.249.131	10.0.249.131
133	10.0.249.132/32	10.0.249.132 – 10.0.249.132	10.0.249.132
134	10.0.249.133/32	10.0.249.133 – 10.0.249.133	10.0.249.133
135	10.0.249.134/32	10.0.249.134 – 10.0.249.134	10.0.249.134
136	10.0.249.135/32	10.0.249.135 – 10.0.249.135	10.0.249.135
137	10.0.249.136/32	10.0.249.136 – 10.0.249.136	10.0.249.136
138	10.0.249.137/32	10.0.249.137 – 10.0.249.137	10.0.249.137
139	10.0.249.138/32	10.0.249.138 – 10.0.249.138	10.0.249.138
140	10.0.249.139/32	10.0.249.139 – 10.0.249.139	10.0.249.139
141	10.0.249.140/32	10.0.249.140 – 10.0.249.140	10.0.249.140
142	10.0.249.141/32	10.0.249.141 – 10.0.249.141	10.0.249.141
143	10.0.249.142/32	10.0.249.142 – 10.0.249.142	10.0.249.142
144	10.0.249.143/32	10.0.249.143 – 10.0.249.143	10.0.249.143
145	10.0.249.144/32	10.0.249.144 – 10.0.249.144	10.0.249.144
146	10.0.249.145/32	10.0.249.145 – 10.0.249.145	10.0.249.145
147	10.0.249.146/32	10.0.249.146 – 10.0.249.146	10.0.249.146
148	10.0.249.147/32	10.0.249.147 – 10.0.249.147	10.0.249.147
149	10.0.249.148/32	10.0.249.148 – 10.0.249.148	10.0.249.148
150	10.0.249.149/32	10.0.249.149 – 10.0.249.149	10.0.249.149
151	10.0.249.150/32	10.0.249.150 – 10.0.249.150	10.0.249.150
152	10.0.249.151/32	10.0.249.151 – 10.0.249.151	10.0.249.151
153	10.0.249.152/32	10.0.249.152 – 10.0.249.152	10.0.249.152
154	10.0.249.153/32	10.0.249.153 – 10.0.249.153	10.0.249.153
155	10.0.249.154/32	10.0.249.154 – 10.0.249.154	10.0.249.154
156	10.0.249.155/32	10.0.249.155 – 10.0.249.155	10.0.249.155
157	10.0.249.156/32	10.0.249.156 – 10.0.249.156	10.0.249.156
158	10.0.249.157/32	10.0.249.157 – 10.0.249.157	10.0.249.157
159	10.0.249.158/32	10.0.249.158 – 10.0.249.158	10.0.249.158
160	10.0.249.159/32	10.0.249.159 – 10.0.249.159	10.0.249.159
161	10.0.249.160/32	10.0.249.160 – 10.0.249.160	10.0.249.160
162	10.0.249.161/32	10.0.249.161 – 10.0.249.161	10.0.249.161
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210	10.0.249.209/32	10.0.249.209 – 10.0.249.209	10.0.249.209
211	10.0.249.210/32	10.0.249.210 – 10.0.249.210	10.0.249.210
212	10.0.249.211/32	10.0.249.211 – 10.0.249.211	10.0.249.211
213	10.0.249.212/32	10.0.249.212 – 10.0.249.212	10.0.249.212
214	10.0.249.213/32	10.0.249.213 – 10.0.249.213	10.0.249.213
215	10.0.249.214/32	10.0.249.214 – 10.0.249.214	10.0.249.214
216	10.0.249.215/32	10.0.249.215 – 10.0.249.215	10.0.249.215
217	10.0.249.216/32	10.0.249.216 – 10.0.249.216	10.0.249.216
218	10.0.249.217/32	10.0.249.217 – 10.0.249.217	10.0.249.217
219	10.0.249.218/32	10.0.249.218 – 10.0.249.218	10.0.249.218
220	10.0.249.219/32	10.0.249.219 – 10.0.249.219	10.0.249.219
221	10.0.249.220/32	10.0.249.220 – 10.0.249.220	10.0.249.220
222	10.0.249.221/32	10.0.249.221 – 10.0.249.221	10.0.249.221
223	10.0.249.222/32	10.0.249.222 – 10.0.249.222	10.0.249.222
224	10.0.249.223/32	10.0.249.223 – 10.0.249.223	10.0.249.223
225	10.0.249.224/32	10.0.249.224 – 10.0.249.224	10.0.249.224
226	10.0.249.225/32	10.0.249.225 – 10.0.249.225	10.0.249.225
227	10.0.249.226/32	10.0.249.226 – 10.0.249.226	10.0.249.226
228	10.0.249.227/32	10.0.249.227 – 10.0.249.227	10.0.249.227
229	10.0.249.228/32	10.0.249.228 – 10.0.249.228	10.0.249.228
230	10.0.249.229/32	10.0.249.229 – 10.0.249.229	10.0.249.229
231	10.0.249.230/32	10.0.249.230 – 10.0.249.230	10.0.249.230
232	10.0.249.231/32	10.0.249.231 – 10.0.249.231	10.0.249.231
233	10.0.249.232/32	10.0.249.232 – 10.0.249.232	10.0.249.232
234	10.0.249.233/32	10.0.249.233 – 10.0.249.233	10.0.249.233
235	10.0.249.234/32	10.0.249.234 – 10.0.249.234	10.0.249.234
236	10.0.249.235/32	10.0.249.235 – 10.0.249.235	10.0.249.235
237	10.0.249.236/32	10.0.249.236 – 10.0.249.236	10.0.249.236
238	10.0.249.237/32	10.0.249.237 – 10.0.249.237	10.0.249.237
239	10.0.249.238/32	10.0.249.238 – 10.0.249.238	10.0.249.238
240	10.0.249.239/32	10.0.249.239 – 10.0.249.239	10.0.249.239
241	10.0.249.240/32	10.0.249.240 – 10.0.249.240	10.0.249.240
242	10.0.249.241/32	10.0.249.241 – 10.0.249.241	10.0.249.241
243	10.0.249.242/32	10.0.249.242 – 10.0.249.242	10.0.249.242
244	10.0.249.243/32	10.0.249.243 – 10.0.249.243	10.0.249.243
245	10.0.249.244/32	10.0.249.244 – 10.0.249.244	10.0.249.244
246	10.0.249.245/32	10.0.249.245 – 10.0.249.245	10.0.249.245
247	10.0.249.246/32	10.0.249.246 – 10.0.249.246	10.0.249.246
248	10.0.249.247/32	10.0.249.247 – 10.0.249.247	10.0.249.247
249	10.0.249.248/32	10.0.249.248 – 10.0.249.248	10.0.249.248
250	10.0.249.249/32	10.0.249.249 – 10.0.249.249	10.0.249.249
251	10.0.249.250/32	10.0.249.250 – 10.0.249.250	10.0.249.250
252	10.0.249.251/32	10.0.249.251 – 10.0.249.251	10.0.249.251
253	10.0.249.252/32	10.0.249.252 – 10.0.249.252	10.0.249.252
254	10.0.249.253/32	10.0.249.253 – 10.0.249.253	10.0.249.253
255	10.0.249.254/32	10.0.249.254 – 10.0.249.254	10.0.249.254
256	10.0.249.255/32	10.0.249.255 – 10.0.249.255	10.0.249.255

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 /24
/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	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →