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)10.4.151.0/24

network10.4.151.0/24

broadcast10.4.151.255

first host10.4.151.1

last host10.4.151.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.4.151.0/24

address00001010.00000100.10010111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000100.10010111.00000000

broadcast00001010.00000100.10010111.11111111

green = network part, grey = host part

hex0x0a049700

decimal168072960

reverse dns0.151.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:9700

/24 split into /32 · 256 subnets

close ×

#	network	host range	broadcast
1	10.4.151.0/32	10.4.151.0 – 10.4.151.0	10.4.151.0
2	10.4.151.1/32	10.4.151.1 – 10.4.151.1	10.4.151.1
3	10.4.151.2/32	10.4.151.2 – 10.4.151.2	10.4.151.2
4	10.4.151.3/32	10.4.151.3 – 10.4.151.3	10.4.151.3
5	10.4.151.4/32	10.4.151.4 – 10.4.151.4	10.4.151.4
6	10.4.151.5/32	10.4.151.5 – 10.4.151.5	10.4.151.5
7	10.4.151.6/32	10.4.151.6 – 10.4.151.6	10.4.151.6
8	10.4.151.7/32	10.4.151.7 – 10.4.151.7	10.4.151.7
9	10.4.151.8/32	10.4.151.8 – 10.4.151.8	10.4.151.8
10	10.4.151.9/32	10.4.151.9 – 10.4.151.9	10.4.151.9
11	10.4.151.10/32	10.4.151.10 – 10.4.151.10	10.4.151.10
12	10.4.151.11/32	10.4.151.11 – 10.4.151.11	10.4.151.11
13	10.4.151.12/32	10.4.151.12 – 10.4.151.12	10.4.151.12
14	10.4.151.13/32	10.4.151.13 – 10.4.151.13	10.4.151.13
15	10.4.151.14/32	10.4.151.14 – 10.4.151.14	10.4.151.14
16	10.4.151.15/32	10.4.151.15 – 10.4.151.15	10.4.151.15
17	10.4.151.16/32	10.4.151.16 – 10.4.151.16	10.4.151.16
18	10.4.151.17/32	10.4.151.17 – 10.4.151.17	10.4.151.17
19	10.4.151.18/32	10.4.151.18 – 10.4.151.18	10.4.151.18
20	10.4.151.19/32	10.4.151.19 – 10.4.151.19	10.4.151.19
21	10.4.151.20/32	10.4.151.20 – 10.4.151.20	10.4.151.20
22	10.4.151.21/32	10.4.151.21 – 10.4.151.21	10.4.151.21
23	10.4.151.22/32	10.4.151.22 – 10.4.151.22	10.4.151.22
24	10.4.151.23/32	10.4.151.23 – 10.4.151.23	10.4.151.23
25	10.4.151.24/32	10.4.151.24 – 10.4.151.24	10.4.151.24
26	10.4.151.25/32	10.4.151.25 – 10.4.151.25	10.4.151.25
27	10.4.151.26/32	10.4.151.26 – 10.4.151.26	10.4.151.26
28	10.4.151.27/32	10.4.151.27 – 10.4.151.27	10.4.151.27
29	10.4.151.28/32	10.4.151.28 – 10.4.151.28	10.4.151.28
30	10.4.151.29/32	10.4.151.29 – 10.4.151.29	10.4.151.29
31	10.4.151.30/32	10.4.151.30 – 10.4.151.30	10.4.151.30
32	10.4.151.31/32	10.4.151.31 – 10.4.151.31	10.4.151.31
33	10.4.151.32/32	10.4.151.32 – 10.4.151.32	10.4.151.32
34	10.4.151.33/32	10.4.151.33 – 10.4.151.33	10.4.151.33
35	10.4.151.34/32	10.4.151.34 – 10.4.151.34	10.4.151.34
36	10.4.151.35/32	10.4.151.35 – 10.4.151.35	10.4.151.35
37	10.4.151.36/32	10.4.151.36 – 10.4.151.36	10.4.151.36
38	10.4.151.37/32	10.4.151.37 – 10.4.151.37	10.4.151.37
39	10.4.151.38/32	10.4.151.38 – 10.4.151.38	10.4.151.38
40	10.4.151.39/32	10.4.151.39 – 10.4.151.39	10.4.151.39
41	10.4.151.40/32	10.4.151.40 – 10.4.151.40	10.4.151.40
42	10.4.151.41/32	10.4.151.41 – 10.4.151.41	10.4.151.41
43	10.4.151.42/32	10.4.151.42 – 10.4.151.42	10.4.151.42
44	10.4.151.43/32	10.4.151.43 – 10.4.151.43	10.4.151.43
45	10.4.151.44/32	10.4.151.44 – 10.4.151.44	10.4.151.44
46	10.4.151.45/32	10.4.151.45 – 10.4.151.45	10.4.151.45
47	10.4.151.46/32	10.4.151.46 – 10.4.151.46	10.4.151.46
48	10.4.151.47/32	10.4.151.47 – 10.4.151.47	10.4.151.47
49	10.4.151.48/32	10.4.151.48 – 10.4.151.48	10.4.151.48
50	10.4.151.49/32	10.4.151.49 – 10.4.151.49	10.4.151.49
51	10.4.151.50/32	10.4.151.50 – 10.4.151.50	10.4.151.50
52	10.4.151.51/32	10.4.151.51 – 10.4.151.51	10.4.151.51
53	10.4.151.52/32	10.4.151.52 – 10.4.151.52	10.4.151.52
54	10.4.151.53/32	10.4.151.53 – 10.4.151.53	10.4.151.53
55	10.4.151.54/32	10.4.151.54 – 10.4.151.54	10.4.151.54
56	10.4.151.55/32	10.4.151.55 – 10.4.151.55	10.4.151.55
57	10.4.151.56/32	10.4.151.56 – 10.4.151.56	10.4.151.56
58	10.4.151.57/32	10.4.151.57 – 10.4.151.57	10.4.151.57
59	10.4.151.58/32	10.4.151.58 – 10.4.151.58	10.4.151.58
60	10.4.151.59/32	10.4.151.59 – 10.4.151.59	10.4.151.59
61	10.4.151.60/32	10.4.151.60 – 10.4.151.60	10.4.151.60
62	10.4.151.61/32	10.4.151.61 – 10.4.151.61	10.4.151.61
63	10.4.151.62/32	10.4.151.62 – 10.4.151.62	10.4.151.62
64	10.4.151.63/32	10.4.151.63 – 10.4.151.63	10.4.151.63
65	10.4.151.64/32	10.4.151.64 – 10.4.151.64	10.4.151.64
66	10.4.151.65/32	10.4.151.65 – 10.4.151.65	10.4.151.65
67	10.4.151.66/32	10.4.151.66 – 10.4.151.66	10.4.151.66
68	10.4.151.67/32	10.4.151.67 – 10.4.151.67	10.4.151.67
69	10.4.151.68/32	10.4.151.68 – 10.4.151.68	10.4.151.68
70	10.4.151.69/32	10.4.151.69 – 10.4.151.69	10.4.151.69
71	10.4.151.70/32	10.4.151.70 – 10.4.151.70	10.4.151.70
72	10.4.151.71/32	10.4.151.71 – 10.4.151.71	10.4.151.71
73	10.4.151.72/32	10.4.151.72 – 10.4.151.72	10.4.151.72
74	10.4.151.73/32	10.4.151.73 – 10.4.151.73	10.4.151.73
75	10.4.151.74/32	10.4.151.74 – 10.4.151.74	10.4.151.74
76	10.4.151.75/32	10.4.151.75 – 10.4.151.75	10.4.151.75
77	10.4.151.76/32	10.4.151.76 – 10.4.151.76	10.4.151.76
78	10.4.151.77/32	10.4.151.77 – 10.4.151.77	10.4.151.77
79	10.4.151.78/32	10.4.151.78 – 10.4.151.78	10.4.151.78
80	10.4.151.79/32	10.4.151.79 – 10.4.151.79	10.4.151.79
81	10.4.151.80/32	10.4.151.80 – 10.4.151.80	10.4.151.80
82	10.4.151.81/32	10.4.151.81 – 10.4.151.81	10.4.151.81
83	10.4.151.82/32	10.4.151.82 – 10.4.151.82	10.4.151.82
84	10.4.151.83/32	10.4.151.83 – 10.4.151.83	10.4.151.83
85	10.4.151.84/32	10.4.151.84 – 10.4.151.84	10.4.151.84
86	10.4.151.85/32	10.4.151.85 – 10.4.151.85	10.4.151.85
87	10.4.151.86/32	10.4.151.86 – 10.4.151.86	10.4.151.86
88	10.4.151.87/32	10.4.151.87 – 10.4.151.87	10.4.151.87
89	10.4.151.88/32	10.4.151.88 – 10.4.151.88	10.4.151.88
90	10.4.151.89/32	10.4.151.89 – 10.4.151.89	10.4.151.89
91	10.4.151.90/32	10.4.151.90 – 10.4.151.90	10.4.151.90
92	10.4.151.91/32	10.4.151.91 – 10.4.151.91	10.4.151.91
93	10.4.151.92/32	10.4.151.92 – 10.4.151.92	10.4.151.92
94	10.4.151.93/32	10.4.151.93 – 10.4.151.93	10.4.151.93
95	10.4.151.94/32	10.4.151.94 – 10.4.151.94	10.4.151.94
96	10.4.151.95/32	10.4.151.95 – 10.4.151.95	10.4.151.95
97	10.4.151.96/32	10.4.151.96 – 10.4.151.96	10.4.151.96
98	10.4.151.97/32	10.4.151.97 – 10.4.151.97	10.4.151.97
99	10.4.151.98/32	10.4.151.98 – 10.4.151.98	10.4.151.98
100	10.4.151.99/32	10.4.151.99 – 10.4.151.99	10.4.151.99
101	10.4.151.100/32	10.4.151.100 – 10.4.151.100	10.4.151.100
102	10.4.151.101/32	10.4.151.101 – 10.4.151.101	10.4.151.101
103	10.4.151.102/32	10.4.151.102 – 10.4.151.102	10.4.151.102
104	10.4.151.103/32	10.4.151.103 – 10.4.151.103	10.4.151.103
105	10.4.151.104/32	10.4.151.104 – 10.4.151.104	10.4.151.104
106	10.4.151.105/32	10.4.151.105 – 10.4.151.105	10.4.151.105
107	10.4.151.106/32	10.4.151.106 – 10.4.151.106	10.4.151.106
108	10.4.151.107/32	10.4.151.107 – 10.4.151.107	10.4.151.107
109	10.4.151.108/32	10.4.151.108 – 10.4.151.108	10.4.151.108
110	10.4.151.109/32	10.4.151.109 – 10.4.151.109	10.4.151.109
111	10.4.151.110/32	10.4.151.110 – 10.4.151.110	10.4.151.110
112	10.4.151.111/32	10.4.151.111 – 10.4.151.111	10.4.151.111
113	10.4.151.112/32	10.4.151.112 – 10.4.151.112	10.4.151.112
114	10.4.151.113/32	10.4.151.113 – 10.4.151.113	10.4.151.113
115	10.4.151.114/32	10.4.151.114 – 10.4.151.114	10.4.151.114
116	10.4.151.115/32	10.4.151.115 – 10.4.151.115	10.4.151.115
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122	10.4.151.121/32	10.4.151.121 – 10.4.151.121	10.4.151.121
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128	10.4.151.127/32	10.4.151.127 – 10.4.151.127	10.4.151.127
129	10.4.151.128/32	10.4.151.128 – 10.4.151.128	10.4.151.128
130	10.4.151.129/32	10.4.151.129 – 10.4.151.129	10.4.151.129
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133	10.4.151.132/32	10.4.151.132 – 10.4.151.132	10.4.151.132
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135	10.4.151.134/32	10.4.151.134 – 10.4.151.134	10.4.151.134
136	10.4.151.135/32	10.4.151.135 – 10.4.151.135	10.4.151.135
137	10.4.151.136/32	10.4.151.136 – 10.4.151.136	10.4.151.136
138	10.4.151.137/32	10.4.151.137 – 10.4.151.137	10.4.151.137
139	10.4.151.138/32	10.4.151.138 – 10.4.151.138	10.4.151.138
140	10.4.151.139/32	10.4.151.139 – 10.4.151.139	10.4.151.139
141	10.4.151.140/32	10.4.151.140 – 10.4.151.140	10.4.151.140
142	10.4.151.141/32	10.4.151.141 – 10.4.151.141	10.4.151.141
143	10.4.151.142/32	10.4.151.142 – 10.4.151.142	10.4.151.142
144	10.4.151.143/32	10.4.151.143 – 10.4.151.143	10.4.151.143
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210	10.4.151.209/32	10.4.151.209 – 10.4.151.209	10.4.151.209
211	10.4.151.210/32	10.4.151.210 – 10.4.151.210	10.4.151.210
212	10.4.151.211/32	10.4.151.211 – 10.4.151.211	10.4.151.211
213	10.4.151.212/32	10.4.151.212 – 10.4.151.212	10.4.151.212
214	10.4.151.213/32	10.4.151.213 – 10.4.151.213	10.4.151.213
215	10.4.151.214/32	10.4.151.214 – 10.4.151.214	10.4.151.214
216	10.4.151.215/32	10.4.151.215 – 10.4.151.215	10.4.151.215
217	10.4.151.216/32	10.4.151.216 – 10.4.151.216	10.4.151.216
218	10.4.151.217/32	10.4.151.217 – 10.4.151.217	10.4.151.217
219	10.4.151.218/32	10.4.151.218 – 10.4.151.218	10.4.151.218
220	10.4.151.219/32	10.4.151.219 – 10.4.151.219	10.4.151.219
221	10.4.151.220/32	10.4.151.220 – 10.4.151.220	10.4.151.220
222	10.4.151.221/32	10.4.151.221 – 10.4.151.221	10.4.151.221
223	10.4.151.222/32	10.4.151.222 – 10.4.151.222	10.4.151.222
224	10.4.151.223/32	10.4.151.223 – 10.4.151.223	10.4.151.223
225	10.4.151.224/32	10.4.151.224 – 10.4.151.224	10.4.151.224
226	10.4.151.225/32	10.4.151.225 – 10.4.151.225	10.4.151.225
227	10.4.151.226/32	10.4.151.226 – 10.4.151.226	10.4.151.226
228	10.4.151.227/32	10.4.151.227 – 10.4.151.227	10.4.151.227
229	10.4.151.228/32	10.4.151.228 – 10.4.151.228	10.4.151.228
230	10.4.151.229/32	10.4.151.229 – 10.4.151.229	10.4.151.229
231	10.4.151.230/32	10.4.151.230 – 10.4.151.230	10.4.151.230
232	10.4.151.231/32	10.4.151.231 – 10.4.151.231	10.4.151.231
233	10.4.151.232/32	10.4.151.232 – 10.4.151.232	10.4.151.232
234	10.4.151.233/32	10.4.151.233 – 10.4.151.233	10.4.151.233
235	10.4.151.234/32	10.4.151.234 – 10.4.151.234	10.4.151.234
236	10.4.151.235/32	10.4.151.235 – 10.4.151.235	10.4.151.235
237	10.4.151.236/32	10.4.151.236 – 10.4.151.236	10.4.151.236
238	10.4.151.237/32	10.4.151.237 – 10.4.151.237	10.4.151.237
239	10.4.151.238/32	10.4.151.238 – 10.4.151.238	10.4.151.238
240	10.4.151.239/32	10.4.151.239 – 10.4.151.239	10.4.151.239
241	10.4.151.240/32	10.4.151.240 – 10.4.151.240	10.4.151.240
242	10.4.151.241/32	10.4.151.241 – 10.4.151.241	10.4.151.241
243	10.4.151.242/32	10.4.151.242 – 10.4.151.242	10.4.151.242
244	10.4.151.243/32	10.4.151.243 – 10.4.151.243	10.4.151.243
245	10.4.151.244/32	10.4.151.244 – 10.4.151.244	10.4.151.244
246	10.4.151.245/32	10.4.151.245 – 10.4.151.245	10.4.151.245
247	10.4.151.246/32	10.4.151.246 – 10.4.151.246	10.4.151.246
248	10.4.151.247/32	10.4.151.247 – 10.4.151.247	10.4.151.247
249	10.4.151.248/32	10.4.151.248 – 10.4.151.248	10.4.151.248
250	10.4.151.249/32	10.4.151.249 – 10.4.151.249	10.4.151.249
251	10.4.151.250/32	10.4.151.250 – 10.4.151.250	10.4.151.250
252	10.4.151.251/32	10.4.151.251 – 10.4.151.251	10.4.151.251
253	10.4.151.252/32	10.4.151.252 – 10.4.151.252	10.4.151.252
254	10.4.151.253/32	10.4.151.253 – 10.4.151.253	10.4.151.253
255	10.4.151.254/32	10.4.151.254 – 10.4.151.254	10.4.151.254
256	10.4.151.255/32	10.4.151.255 – 10.4.151.255	10.4.151.255

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 →