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)10.151.84.0/25

network10.151.84.0/25

broadcast10.151.84.127

first host10.151.84.1

last host10.151.84.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.151.84.0/25

address00001010.10010111.01010100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10010111.01010100.00000000

broadcast00001010.10010111.01010100.01111111

green = network part, grey = host part

hex0x0a975400

decimal177689600

reverse dns0.84.151.10.in-addr.arpa

ipv4-mapped::ffff:a97:5400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.151.84.0/32	10.151.84.0 – 10.151.84.0	10.151.84.0
2	10.151.84.1/32	10.151.84.1 – 10.151.84.1	10.151.84.1
3	10.151.84.2/32	10.151.84.2 – 10.151.84.2	10.151.84.2
4	10.151.84.3/32	10.151.84.3 – 10.151.84.3	10.151.84.3
5	10.151.84.4/32	10.151.84.4 – 10.151.84.4	10.151.84.4
6	10.151.84.5/32	10.151.84.5 – 10.151.84.5	10.151.84.5
7	10.151.84.6/32	10.151.84.6 – 10.151.84.6	10.151.84.6
8	10.151.84.7/32	10.151.84.7 – 10.151.84.7	10.151.84.7
9	10.151.84.8/32	10.151.84.8 – 10.151.84.8	10.151.84.8
10	10.151.84.9/32	10.151.84.9 – 10.151.84.9	10.151.84.9
11	10.151.84.10/32	10.151.84.10 – 10.151.84.10	10.151.84.10
12	10.151.84.11/32	10.151.84.11 – 10.151.84.11	10.151.84.11
13	10.151.84.12/32	10.151.84.12 – 10.151.84.12	10.151.84.12
14	10.151.84.13/32	10.151.84.13 – 10.151.84.13	10.151.84.13
15	10.151.84.14/32	10.151.84.14 – 10.151.84.14	10.151.84.14
16	10.151.84.15/32	10.151.84.15 – 10.151.84.15	10.151.84.15
17	10.151.84.16/32	10.151.84.16 – 10.151.84.16	10.151.84.16
18	10.151.84.17/32	10.151.84.17 – 10.151.84.17	10.151.84.17
19	10.151.84.18/32	10.151.84.18 – 10.151.84.18	10.151.84.18
20	10.151.84.19/32	10.151.84.19 – 10.151.84.19	10.151.84.19
21	10.151.84.20/32	10.151.84.20 – 10.151.84.20	10.151.84.20
22	10.151.84.21/32	10.151.84.21 – 10.151.84.21	10.151.84.21
23	10.151.84.22/32	10.151.84.22 – 10.151.84.22	10.151.84.22
24	10.151.84.23/32	10.151.84.23 – 10.151.84.23	10.151.84.23
25	10.151.84.24/32	10.151.84.24 – 10.151.84.24	10.151.84.24
26	10.151.84.25/32	10.151.84.25 – 10.151.84.25	10.151.84.25
27	10.151.84.26/32	10.151.84.26 – 10.151.84.26	10.151.84.26
28	10.151.84.27/32	10.151.84.27 – 10.151.84.27	10.151.84.27
29	10.151.84.28/32	10.151.84.28 – 10.151.84.28	10.151.84.28
30	10.151.84.29/32	10.151.84.29 – 10.151.84.29	10.151.84.29
31	10.151.84.30/32	10.151.84.30 – 10.151.84.30	10.151.84.30
32	10.151.84.31/32	10.151.84.31 – 10.151.84.31	10.151.84.31
33	10.151.84.32/32	10.151.84.32 – 10.151.84.32	10.151.84.32
34	10.151.84.33/32	10.151.84.33 – 10.151.84.33	10.151.84.33
35	10.151.84.34/32	10.151.84.34 – 10.151.84.34	10.151.84.34
36	10.151.84.35/32	10.151.84.35 – 10.151.84.35	10.151.84.35
37	10.151.84.36/32	10.151.84.36 – 10.151.84.36	10.151.84.36
38	10.151.84.37/32	10.151.84.37 – 10.151.84.37	10.151.84.37
39	10.151.84.38/32	10.151.84.38 – 10.151.84.38	10.151.84.38
40	10.151.84.39/32	10.151.84.39 – 10.151.84.39	10.151.84.39
41	10.151.84.40/32	10.151.84.40 – 10.151.84.40	10.151.84.40
42	10.151.84.41/32	10.151.84.41 – 10.151.84.41	10.151.84.41
43	10.151.84.42/32	10.151.84.42 – 10.151.84.42	10.151.84.42
44	10.151.84.43/32	10.151.84.43 – 10.151.84.43	10.151.84.43
45	10.151.84.44/32	10.151.84.44 – 10.151.84.44	10.151.84.44
46	10.151.84.45/32	10.151.84.45 – 10.151.84.45	10.151.84.45
47	10.151.84.46/32	10.151.84.46 – 10.151.84.46	10.151.84.46
48	10.151.84.47/32	10.151.84.47 – 10.151.84.47	10.151.84.47
49	10.151.84.48/32	10.151.84.48 – 10.151.84.48	10.151.84.48
50	10.151.84.49/32	10.151.84.49 – 10.151.84.49	10.151.84.49
51	10.151.84.50/32	10.151.84.50 – 10.151.84.50	10.151.84.50
52	10.151.84.51/32	10.151.84.51 – 10.151.84.51	10.151.84.51
53	10.151.84.52/32	10.151.84.52 – 10.151.84.52	10.151.84.52
54	10.151.84.53/32	10.151.84.53 – 10.151.84.53	10.151.84.53
55	10.151.84.54/32	10.151.84.54 – 10.151.84.54	10.151.84.54
56	10.151.84.55/32	10.151.84.55 – 10.151.84.55	10.151.84.55
57	10.151.84.56/32	10.151.84.56 – 10.151.84.56	10.151.84.56
58	10.151.84.57/32	10.151.84.57 – 10.151.84.57	10.151.84.57
59	10.151.84.58/32	10.151.84.58 – 10.151.84.58	10.151.84.58
60	10.151.84.59/32	10.151.84.59 – 10.151.84.59	10.151.84.59
61	10.151.84.60/32	10.151.84.60 – 10.151.84.60	10.151.84.60
62	10.151.84.61/32	10.151.84.61 – 10.151.84.61	10.151.84.61
63	10.151.84.62/32	10.151.84.62 – 10.151.84.62	10.151.84.62
64	10.151.84.63/32	10.151.84.63 – 10.151.84.63	10.151.84.63
65	10.151.84.64/32	10.151.84.64 – 10.151.84.64	10.151.84.64
66	10.151.84.65/32	10.151.84.65 – 10.151.84.65	10.151.84.65
67	10.151.84.66/32	10.151.84.66 – 10.151.84.66	10.151.84.66
68	10.151.84.67/32	10.151.84.67 – 10.151.84.67	10.151.84.67
69	10.151.84.68/32	10.151.84.68 – 10.151.84.68	10.151.84.68
70	10.151.84.69/32	10.151.84.69 – 10.151.84.69	10.151.84.69
71	10.151.84.70/32	10.151.84.70 – 10.151.84.70	10.151.84.70
72	10.151.84.71/32	10.151.84.71 – 10.151.84.71	10.151.84.71
73	10.151.84.72/32	10.151.84.72 – 10.151.84.72	10.151.84.72
74	10.151.84.73/32	10.151.84.73 – 10.151.84.73	10.151.84.73
75	10.151.84.74/32	10.151.84.74 – 10.151.84.74	10.151.84.74
76	10.151.84.75/32	10.151.84.75 – 10.151.84.75	10.151.84.75
77	10.151.84.76/32	10.151.84.76 – 10.151.84.76	10.151.84.76
78	10.151.84.77/32	10.151.84.77 – 10.151.84.77	10.151.84.77
79	10.151.84.78/32	10.151.84.78 – 10.151.84.78	10.151.84.78
80	10.151.84.79/32	10.151.84.79 – 10.151.84.79	10.151.84.79
81	10.151.84.80/32	10.151.84.80 – 10.151.84.80	10.151.84.80
82	10.151.84.81/32	10.151.84.81 – 10.151.84.81	10.151.84.81
83	10.151.84.82/32	10.151.84.82 – 10.151.84.82	10.151.84.82
84	10.151.84.83/32	10.151.84.83 – 10.151.84.83	10.151.84.83
85	10.151.84.84/32	10.151.84.84 – 10.151.84.84	10.151.84.84
86	10.151.84.85/32	10.151.84.85 – 10.151.84.85	10.151.84.85
87	10.151.84.86/32	10.151.84.86 – 10.151.84.86	10.151.84.86
88	10.151.84.87/32	10.151.84.87 – 10.151.84.87	10.151.84.87
89	10.151.84.88/32	10.151.84.88 – 10.151.84.88	10.151.84.88
90	10.151.84.89/32	10.151.84.89 – 10.151.84.89	10.151.84.89
91	10.151.84.90/32	10.151.84.90 – 10.151.84.90	10.151.84.90
92	10.151.84.91/32	10.151.84.91 – 10.151.84.91	10.151.84.91
93	10.151.84.92/32	10.151.84.92 – 10.151.84.92	10.151.84.92
94	10.151.84.93/32	10.151.84.93 – 10.151.84.93	10.151.84.93
95	10.151.84.94/32	10.151.84.94 – 10.151.84.94	10.151.84.94
96	10.151.84.95/32	10.151.84.95 – 10.151.84.95	10.151.84.95
97	10.151.84.96/32	10.151.84.96 – 10.151.84.96	10.151.84.96
98	10.151.84.97/32	10.151.84.97 – 10.151.84.97	10.151.84.97
99	10.151.84.98/32	10.151.84.98 – 10.151.84.98	10.151.84.98
100	10.151.84.99/32	10.151.84.99 – 10.151.84.99	10.151.84.99
101	10.151.84.100/32	10.151.84.100 – 10.151.84.100	10.151.84.100
102	10.151.84.101/32	10.151.84.101 – 10.151.84.101	10.151.84.101
103	10.151.84.102/32	10.151.84.102 – 10.151.84.102	10.151.84.102
104	10.151.84.103/32	10.151.84.103 – 10.151.84.103	10.151.84.103
105	10.151.84.104/32	10.151.84.104 – 10.151.84.104	10.151.84.104
106	10.151.84.105/32	10.151.84.105 – 10.151.84.105	10.151.84.105
107	10.151.84.106/32	10.151.84.106 – 10.151.84.106	10.151.84.106
108	10.151.84.107/32	10.151.84.107 – 10.151.84.107	10.151.84.107
109	10.151.84.108/32	10.151.84.108 – 10.151.84.108	10.151.84.108
110	10.151.84.109/32	10.151.84.109 – 10.151.84.109	10.151.84.109
111	10.151.84.110/32	10.151.84.110 – 10.151.84.110	10.151.84.110
112	10.151.84.111/32	10.151.84.111 – 10.151.84.111	10.151.84.111
113	10.151.84.112/32	10.151.84.112 – 10.151.84.112	10.151.84.112
114	10.151.84.113/32	10.151.84.113 – 10.151.84.113	10.151.84.113
115	10.151.84.114/32	10.151.84.114 – 10.151.84.114	10.151.84.114
116	10.151.84.115/32	10.151.84.115 – 10.151.84.115	10.151.84.115
117	10.151.84.116/32	10.151.84.116 – 10.151.84.116	10.151.84.116
118	10.151.84.117/32	10.151.84.117 – 10.151.84.117	10.151.84.117
119	10.151.84.118/32	10.151.84.118 – 10.151.84.118	10.151.84.118
120	10.151.84.119/32	10.151.84.119 – 10.151.84.119	10.151.84.119
121	10.151.84.120/32	10.151.84.120 – 10.151.84.120	10.151.84.120
122	10.151.84.121/32	10.151.84.121 – 10.151.84.121	10.151.84.121
123	10.151.84.122/32	10.151.84.122 – 10.151.84.122	10.151.84.122
124	10.151.84.123/32	10.151.84.123 – 10.151.84.123	10.151.84.123
125	10.151.84.124/32	10.151.84.124 – 10.151.84.124	10.151.84.124
126	10.151.84.125/32	10.151.84.125 – 10.151.84.125	10.151.84.125
127	10.151.84.126/32	10.151.84.126 – 10.151.84.126	10.151.84.126
128	10.151.84.127/32	10.151.84.127 – 10.151.84.127	10.151.84.127

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