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)10.2.143.0/24

network10.2.143.0/24

broadcast10.2.143.255

first host10.2.143.1

last host10.2.143.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.143.0/24

address00001010.00000010.10001111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10001111.00000000

broadcast00001010.00000010.10001111.11111111

green = network part, grey = host part

hex0x0a028f00

decimal167939840

reverse dns0.143.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8f00

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.143.0/32	10.2.143.0 – 10.2.143.0	10.2.143.0
2	10.2.143.1/32	10.2.143.1 – 10.2.143.1	10.2.143.1
3	10.2.143.2/32	10.2.143.2 – 10.2.143.2	10.2.143.2
4	10.2.143.3/32	10.2.143.3 – 10.2.143.3	10.2.143.3
5	10.2.143.4/32	10.2.143.4 – 10.2.143.4	10.2.143.4
6	10.2.143.5/32	10.2.143.5 – 10.2.143.5	10.2.143.5
7	10.2.143.6/32	10.2.143.6 – 10.2.143.6	10.2.143.6
8	10.2.143.7/32	10.2.143.7 – 10.2.143.7	10.2.143.7
9	10.2.143.8/32	10.2.143.8 – 10.2.143.8	10.2.143.8
10	10.2.143.9/32	10.2.143.9 – 10.2.143.9	10.2.143.9
11	10.2.143.10/32	10.2.143.10 – 10.2.143.10	10.2.143.10
12	10.2.143.11/32	10.2.143.11 – 10.2.143.11	10.2.143.11
13	10.2.143.12/32	10.2.143.12 – 10.2.143.12	10.2.143.12
14	10.2.143.13/32	10.2.143.13 – 10.2.143.13	10.2.143.13
15	10.2.143.14/32	10.2.143.14 – 10.2.143.14	10.2.143.14
16	10.2.143.15/32	10.2.143.15 – 10.2.143.15	10.2.143.15
17	10.2.143.16/32	10.2.143.16 – 10.2.143.16	10.2.143.16
18	10.2.143.17/32	10.2.143.17 – 10.2.143.17	10.2.143.17
19	10.2.143.18/32	10.2.143.18 – 10.2.143.18	10.2.143.18
20	10.2.143.19/32	10.2.143.19 – 10.2.143.19	10.2.143.19
21	10.2.143.20/32	10.2.143.20 – 10.2.143.20	10.2.143.20
22	10.2.143.21/32	10.2.143.21 – 10.2.143.21	10.2.143.21
23	10.2.143.22/32	10.2.143.22 – 10.2.143.22	10.2.143.22
24	10.2.143.23/32	10.2.143.23 – 10.2.143.23	10.2.143.23
25	10.2.143.24/32	10.2.143.24 – 10.2.143.24	10.2.143.24
26	10.2.143.25/32	10.2.143.25 – 10.2.143.25	10.2.143.25
27	10.2.143.26/32	10.2.143.26 – 10.2.143.26	10.2.143.26
28	10.2.143.27/32	10.2.143.27 – 10.2.143.27	10.2.143.27
29	10.2.143.28/32	10.2.143.28 – 10.2.143.28	10.2.143.28
30	10.2.143.29/32	10.2.143.29 – 10.2.143.29	10.2.143.29
31	10.2.143.30/32	10.2.143.30 – 10.2.143.30	10.2.143.30
32	10.2.143.31/32	10.2.143.31 – 10.2.143.31	10.2.143.31
33	10.2.143.32/32	10.2.143.32 – 10.2.143.32	10.2.143.32
34	10.2.143.33/32	10.2.143.33 – 10.2.143.33	10.2.143.33
35	10.2.143.34/32	10.2.143.34 – 10.2.143.34	10.2.143.34
36	10.2.143.35/32	10.2.143.35 – 10.2.143.35	10.2.143.35
37	10.2.143.36/32	10.2.143.36 – 10.2.143.36	10.2.143.36
38	10.2.143.37/32	10.2.143.37 – 10.2.143.37	10.2.143.37
39	10.2.143.38/32	10.2.143.38 – 10.2.143.38	10.2.143.38
40	10.2.143.39/32	10.2.143.39 – 10.2.143.39	10.2.143.39
41	10.2.143.40/32	10.2.143.40 – 10.2.143.40	10.2.143.40
42	10.2.143.41/32	10.2.143.41 – 10.2.143.41	10.2.143.41
43	10.2.143.42/32	10.2.143.42 – 10.2.143.42	10.2.143.42
44	10.2.143.43/32	10.2.143.43 – 10.2.143.43	10.2.143.43
45	10.2.143.44/32	10.2.143.44 – 10.2.143.44	10.2.143.44
46	10.2.143.45/32	10.2.143.45 – 10.2.143.45	10.2.143.45
47	10.2.143.46/32	10.2.143.46 – 10.2.143.46	10.2.143.46
48	10.2.143.47/32	10.2.143.47 – 10.2.143.47	10.2.143.47
49	10.2.143.48/32	10.2.143.48 – 10.2.143.48	10.2.143.48
50	10.2.143.49/32	10.2.143.49 – 10.2.143.49	10.2.143.49
51	10.2.143.50/32	10.2.143.50 – 10.2.143.50	10.2.143.50
52	10.2.143.51/32	10.2.143.51 – 10.2.143.51	10.2.143.51
53	10.2.143.52/32	10.2.143.52 – 10.2.143.52	10.2.143.52
54	10.2.143.53/32	10.2.143.53 – 10.2.143.53	10.2.143.53
55	10.2.143.54/32	10.2.143.54 – 10.2.143.54	10.2.143.54
56	10.2.143.55/32	10.2.143.55 – 10.2.143.55	10.2.143.55
57	10.2.143.56/32	10.2.143.56 – 10.2.143.56	10.2.143.56
58	10.2.143.57/32	10.2.143.57 – 10.2.143.57	10.2.143.57
59	10.2.143.58/32	10.2.143.58 – 10.2.143.58	10.2.143.58
60	10.2.143.59/32	10.2.143.59 – 10.2.143.59	10.2.143.59
61	10.2.143.60/32	10.2.143.60 – 10.2.143.60	10.2.143.60
62	10.2.143.61/32	10.2.143.61 – 10.2.143.61	10.2.143.61
63	10.2.143.62/32	10.2.143.62 – 10.2.143.62	10.2.143.62
64	10.2.143.63/32	10.2.143.63 – 10.2.143.63	10.2.143.63
65	10.2.143.64/32	10.2.143.64 – 10.2.143.64	10.2.143.64
66	10.2.143.65/32	10.2.143.65 – 10.2.143.65	10.2.143.65
67	10.2.143.66/32	10.2.143.66 – 10.2.143.66	10.2.143.66
68	10.2.143.67/32	10.2.143.67 – 10.2.143.67	10.2.143.67
69	10.2.143.68/32	10.2.143.68 – 10.2.143.68	10.2.143.68
70	10.2.143.69/32	10.2.143.69 – 10.2.143.69	10.2.143.69
71	10.2.143.70/32	10.2.143.70 – 10.2.143.70	10.2.143.70
72	10.2.143.71/32	10.2.143.71 – 10.2.143.71	10.2.143.71
73	10.2.143.72/32	10.2.143.72 – 10.2.143.72	10.2.143.72
74	10.2.143.73/32	10.2.143.73 – 10.2.143.73	10.2.143.73
75	10.2.143.74/32	10.2.143.74 – 10.2.143.74	10.2.143.74
76	10.2.143.75/32	10.2.143.75 – 10.2.143.75	10.2.143.75
77	10.2.143.76/32	10.2.143.76 – 10.2.143.76	10.2.143.76
78	10.2.143.77/32	10.2.143.77 – 10.2.143.77	10.2.143.77
79	10.2.143.78/32	10.2.143.78 – 10.2.143.78	10.2.143.78
80	10.2.143.79/32	10.2.143.79 – 10.2.143.79	10.2.143.79
81	10.2.143.80/32	10.2.143.80 – 10.2.143.80	10.2.143.80
82	10.2.143.81/32	10.2.143.81 – 10.2.143.81	10.2.143.81
83	10.2.143.82/32	10.2.143.82 – 10.2.143.82	10.2.143.82
84	10.2.143.83/32	10.2.143.83 – 10.2.143.83	10.2.143.83
85	10.2.143.84/32	10.2.143.84 – 10.2.143.84	10.2.143.84
86	10.2.143.85/32	10.2.143.85 – 10.2.143.85	10.2.143.85
87	10.2.143.86/32	10.2.143.86 – 10.2.143.86	10.2.143.86
88	10.2.143.87/32	10.2.143.87 – 10.2.143.87	10.2.143.87
89	10.2.143.88/32	10.2.143.88 – 10.2.143.88	10.2.143.88
90	10.2.143.89/32	10.2.143.89 – 10.2.143.89	10.2.143.89
91	10.2.143.90/32	10.2.143.90 – 10.2.143.90	10.2.143.90
92	10.2.143.91/32	10.2.143.91 – 10.2.143.91	10.2.143.91
93	10.2.143.92/32	10.2.143.92 – 10.2.143.92	10.2.143.92
94	10.2.143.93/32	10.2.143.93 – 10.2.143.93	10.2.143.93
95	10.2.143.94/32	10.2.143.94 – 10.2.143.94	10.2.143.94
96	10.2.143.95/32	10.2.143.95 – 10.2.143.95	10.2.143.95
97	10.2.143.96/32	10.2.143.96 – 10.2.143.96	10.2.143.96
98	10.2.143.97/32	10.2.143.97 – 10.2.143.97	10.2.143.97
99	10.2.143.98/32	10.2.143.98 – 10.2.143.98	10.2.143.98
100	10.2.143.99/32	10.2.143.99 – 10.2.143.99	10.2.143.99
101	10.2.143.100/32	10.2.143.100 – 10.2.143.100	10.2.143.100
102	10.2.143.101/32	10.2.143.101 – 10.2.143.101	10.2.143.101
103	10.2.143.102/32	10.2.143.102 – 10.2.143.102	10.2.143.102
104	10.2.143.103/32	10.2.143.103 – 10.2.143.103	10.2.143.103
105	10.2.143.104/32	10.2.143.104 – 10.2.143.104	10.2.143.104
106	10.2.143.105/32	10.2.143.105 – 10.2.143.105	10.2.143.105
107	10.2.143.106/32	10.2.143.106 – 10.2.143.106	10.2.143.106
108	10.2.143.107/32	10.2.143.107 – 10.2.143.107	10.2.143.107
109	10.2.143.108/32	10.2.143.108 – 10.2.143.108	10.2.143.108
110	10.2.143.109/32	10.2.143.109 – 10.2.143.109	10.2.143.109
111	10.2.143.110/32	10.2.143.110 – 10.2.143.110	10.2.143.110
112	10.2.143.111/32	10.2.143.111 – 10.2.143.111	10.2.143.111
113	10.2.143.112/32	10.2.143.112 – 10.2.143.112	10.2.143.112
114	10.2.143.113/32	10.2.143.113 – 10.2.143.113	10.2.143.113
115	10.2.143.114/32	10.2.143.114 – 10.2.143.114	10.2.143.114
116	10.2.143.115/32	10.2.143.115 – 10.2.143.115	10.2.143.115
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121	10.2.143.120/32	10.2.143.120 – 10.2.143.120	10.2.143.120
122	10.2.143.121/32	10.2.143.121 – 10.2.143.121	10.2.143.121
123	10.2.143.122/32	10.2.143.122 – 10.2.143.122	10.2.143.122
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125	10.2.143.124/32	10.2.143.124 – 10.2.143.124	10.2.143.124
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128	10.2.143.127/32	10.2.143.127 – 10.2.143.127	10.2.143.127
129	10.2.143.128/32	10.2.143.128 – 10.2.143.128	10.2.143.128
130	10.2.143.129/32	10.2.143.129 – 10.2.143.129	10.2.143.129
131	10.2.143.130/32	10.2.143.130 – 10.2.143.130	10.2.143.130
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133	10.2.143.132/32	10.2.143.132 – 10.2.143.132	10.2.143.132
134	10.2.143.133/32	10.2.143.133 – 10.2.143.133	10.2.143.133
135	10.2.143.134/32	10.2.143.134 – 10.2.143.134	10.2.143.134
136	10.2.143.135/32	10.2.143.135 – 10.2.143.135	10.2.143.135
137	10.2.143.136/32	10.2.143.136 – 10.2.143.136	10.2.143.136
138	10.2.143.137/32	10.2.143.137 – 10.2.143.137	10.2.143.137
139	10.2.143.138/32	10.2.143.138 – 10.2.143.138	10.2.143.138
140	10.2.143.139/32	10.2.143.139 – 10.2.143.139	10.2.143.139
141	10.2.143.140/32	10.2.143.140 – 10.2.143.140	10.2.143.140
142	10.2.143.141/32	10.2.143.141 – 10.2.143.141	10.2.143.141
143	10.2.143.142/32	10.2.143.142 – 10.2.143.142	10.2.143.142
144	10.2.143.143/32	10.2.143.143 – 10.2.143.143	10.2.143.143
145	10.2.143.144/32	10.2.143.144 – 10.2.143.144	10.2.143.144
146	10.2.143.145/32	10.2.143.145 – 10.2.143.145	10.2.143.145
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149	10.2.143.148/32	10.2.143.148 – 10.2.143.148	10.2.143.148
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210	10.2.143.209/32	10.2.143.209 – 10.2.143.209	10.2.143.209
211	10.2.143.210/32	10.2.143.210 – 10.2.143.210	10.2.143.210
212	10.2.143.211/32	10.2.143.211 – 10.2.143.211	10.2.143.211
213	10.2.143.212/32	10.2.143.212 – 10.2.143.212	10.2.143.212
214	10.2.143.213/32	10.2.143.213 – 10.2.143.213	10.2.143.213
215	10.2.143.214/32	10.2.143.214 – 10.2.143.214	10.2.143.214
216	10.2.143.215/32	10.2.143.215 – 10.2.143.215	10.2.143.215
217	10.2.143.216/32	10.2.143.216 – 10.2.143.216	10.2.143.216
218	10.2.143.217/32	10.2.143.217 – 10.2.143.217	10.2.143.217
219	10.2.143.218/32	10.2.143.218 – 10.2.143.218	10.2.143.218
220	10.2.143.219/32	10.2.143.219 – 10.2.143.219	10.2.143.219
221	10.2.143.220/32	10.2.143.220 – 10.2.143.220	10.2.143.220
222	10.2.143.221/32	10.2.143.221 – 10.2.143.221	10.2.143.221
223	10.2.143.222/32	10.2.143.222 – 10.2.143.222	10.2.143.222
224	10.2.143.223/32	10.2.143.223 – 10.2.143.223	10.2.143.223
225	10.2.143.224/32	10.2.143.224 – 10.2.143.224	10.2.143.224
226	10.2.143.225/32	10.2.143.225 – 10.2.143.225	10.2.143.225
227	10.2.143.226/32	10.2.143.226 – 10.2.143.226	10.2.143.226
228	10.2.143.227/32	10.2.143.227 – 10.2.143.227	10.2.143.227
229	10.2.143.228/32	10.2.143.228 – 10.2.143.228	10.2.143.228
230	10.2.143.229/32	10.2.143.229 – 10.2.143.229	10.2.143.229
231	10.2.143.230/32	10.2.143.230 – 10.2.143.230	10.2.143.230
232	10.2.143.231/32	10.2.143.231 – 10.2.143.231	10.2.143.231
233	10.2.143.232/32	10.2.143.232 – 10.2.143.232	10.2.143.232
234	10.2.143.233/32	10.2.143.233 – 10.2.143.233	10.2.143.233
235	10.2.143.234/32	10.2.143.234 – 10.2.143.234	10.2.143.234
236	10.2.143.235/32	10.2.143.235 – 10.2.143.235	10.2.143.235
237	10.2.143.236/32	10.2.143.236 – 10.2.143.236	10.2.143.236
238	10.2.143.237/32	10.2.143.237 – 10.2.143.237	10.2.143.237
239	10.2.143.238/32	10.2.143.238 – 10.2.143.238	10.2.143.238
240	10.2.143.239/32	10.2.143.239 – 10.2.143.239	10.2.143.239
241	10.2.143.240/32	10.2.143.240 – 10.2.143.240	10.2.143.240
242	10.2.143.241/32	10.2.143.241 – 10.2.143.241	10.2.143.241
243	10.2.143.242/32	10.2.143.242 – 10.2.143.242	10.2.143.242
244	10.2.143.243/32	10.2.143.243 – 10.2.143.243	10.2.143.243
245	10.2.143.244/32	10.2.143.244 – 10.2.143.244	10.2.143.244
246	10.2.143.245/32	10.2.143.245 – 10.2.143.245	10.2.143.245
247	10.2.143.246/32	10.2.143.246 – 10.2.143.246	10.2.143.246
248	10.2.143.247/32	10.2.143.247 – 10.2.143.247	10.2.143.247
249	10.2.143.248/32	10.2.143.248 – 10.2.143.248	10.2.143.248
250	10.2.143.249/32	10.2.143.249 – 10.2.143.249	10.2.143.249
251	10.2.143.250/32	10.2.143.250 – 10.2.143.250	10.2.143.250
252	10.2.143.251/32	10.2.143.251 – 10.2.143.251	10.2.143.251
253	10.2.143.252/32	10.2.143.252 – 10.2.143.252	10.2.143.252
254	10.2.143.253/32	10.2.143.253 – 10.2.143.253	10.2.143.253
255	10.2.143.254/32	10.2.143.254 – 10.2.143.254	10.2.143.254
256	10.2.143.255/32	10.2.143.255 – 10.2.143.255	10.2.143.255

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 →