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)10.2.65.0/25

network10.2.65.0/25

broadcast10.2.65.127

first host10.2.65.1

last host10.2.65.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.65.0/25

address00001010.00000010.01000001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01000001.00000000

broadcast00001010.00000010.01000001.01111111

green = network part, grey = host part

hex0x0a024100

decimal167919872

reverse dns0.65.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.65.0/32	10.2.65.0 – 10.2.65.0	10.2.65.0
2	10.2.65.1/32	10.2.65.1 – 10.2.65.1	10.2.65.1
3	10.2.65.2/32	10.2.65.2 – 10.2.65.2	10.2.65.2
4	10.2.65.3/32	10.2.65.3 – 10.2.65.3	10.2.65.3
5	10.2.65.4/32	10.2.65.4 – 10.2.65.4	10.2.65.4
6	10.2.65.5/32	10.2.65.5 – 10.2.65.5	10.2.65.5
7	10.2.65.6/32	10.2.65.6 – 10.2.65.6	10.2.65.6
8	10.2.65.7/32	10.2.65.7 – 10.2.65.7	10.2.65.7
9	10.2.65.8/32	10.2.65.8 – 10.2.65.8	10.2.65.8
10	10.2.65.9/32	10.2.65.9 – 10.2.65.9	10.2.65.9
11	10.2.65.10/32	10.2.65.10 – 10.2.65.10	10.2.65.10
12	10.2.65.11/32	10.2.65.11 – 10.2.65.11	10.2.65.11
13	10.2.65.12/32	10.2.65.12 – 10.2.65.12	10.2.65.12
14	10.2.65.13/32	10.2.65.13 – 10.2.65.13	10.2.65.13
15	10.2.65.14/32	10.2.65.14 – 10.2.65.14	10.2.65.14
16	10.2.65.15/32	10.2.65.15 – 10.2.65.15	10.2.65.15
17	10.2.65.16/32	10.2.65.16 – 10.2.65.16	10.2.65.16
18	10.2.65.17/32	10.2.65.17 – 10.2.65.17	10.2.65.17
19	10.2.65.18/32	10.2.65.18 – 10.2.65.18	10.2.65.18
20	10.2.65.19/32	10.2.65.19 – 10.2.65.19	10.2.65.19
21	10.2.65.20/32	10.2.65.20 – 10.2.65.20	10.2.65.20
22	10.2.65.21/32	10.2.65.21 – 10.2.65.21	10.2.65.21
23	10.2.65.22/32	10.2.65.22 – 10.2.65.22	10.2.65.22
24	10.2.65.23/32	10.2.65.23 – 10.2.65.23	10.2.65.23
25	10.2.65.24/32	10.2.65.24 – 10.2.65.24	10.2.65.24
26	10.2.65.25/32	10.2.65.25 – 10.2.65.25	10.2.65.25
27	10.2.65.26/32	10.2.65.26 – 10.2.65.26	10.2.65.26
28	10.2.65.27/32	10.2.65.27 – 10.2.65.27	10.2.65.27
29	10.2.65.28/32	10.2.65.28 – 10.2.65.28	10.2.65.28
30	10.2.65.29/32	10.2.65.29 – 10.2.65.29	10.2.65.29
31	10.2.65.30/32	10.2.65.30 – 10.2.65.30	10.2.65.30
32	10.2.65.31/32	10.2.65.31 – 10.2.65.31	10.2.65.31
33	10.2.65.32/32	10.2.65.32 – 10.2.65.32	10.2.65.32
34	10.2.65.33/32	10.2.65.33 – 10.2.65.33	10.2.65.33
35	10.2.65.34/32	10.2.65.34 – 10.2.65.34	10.2.65.34
36	10.2.65.35/32	10.2.65.35 – 10.2.65.35	10.2.65.35
37	10.2.65.36/32	10.2.65.36 – 10.2.65.36	10.2.65.36
38	10.2.65.37/32	10.2.65.37 – 10.2.65.37	10.2.65.37
39	10.2.65.38/32	10.2.65.38 – 10.2.65.38	10.2.65.38
40	10.2.65.39/32	10.2.65.39 – 10.2.65.39	10.2.65.39
41	10.2.65.40/32	10.2.65.40 – 10.2.65.40	10.2.65.40
42	10.2.65.41/32	10.2.65.41 – 10.2.65.41	10.2.65.41
43	10.2.65.42/32	10.2.65.42 – 10.2.65.42	10.2.65.42
44	10.2.65.43/32	10.2.65.43 – 10.2.65.43	10.2.65.43
45	10.2.65.44/32	10.2.65.44 – 10.2.65.44	10.2.65.44
46	10.2.65.45/32	10.2.65.45 – 10.2.65.45	10.2.65.45
47	10.2.65.46/32	10.2.65.46 – 10.2.65.46	10.2.65.46
48	10.2.65.47/32	10.2.65.47 – 10.2.65.47	10.2.65.47
49	10.2.65.48/32	10.2.65.48 – 10.2.65.48	10.2.65.48
50	10.2.65.49/32	10.2.65.49 – 10.2.65.49	10.2.65.49
51	10.2.65.50/32	10.2.65.50 – 10.2.65.50	10.2.65.50
52	10.2.65.51/32	10.2.65.51 – 10.2.65.51	10.2.65.51
53	10.2.65.52/32	10.2.65.52 – 10.2.65.52	10.2.65.52
54	10.2.65.53/32	10.2.65.53 – 10.2.65.53	10.2.65.53
55	10.2.65.54/32	10.2.65.54 – 10.2.65.54	10.2.65.54
56	10.2.65.55/32	10.2.65.55 – 10.2.65.55	10.2.65.55
57	10.2.65.56/32	10.2.65.56 – 10.2.65.56	10.2.65.56
58	10.2.65.57/32	10.2.65.57 – 10.2.65.57	10.2.65.57
59	10.2.65.58/32	10.2.65.58 – 10.2.65.58	10.2.65.58
60	10.2.65.59/32	10.2.65.59 – 10.2.65.59	10.2.65.59
61	10.2.65.60/32	10.2.65.60 – 10.2.65.60	10.2.65.60
62	10.2.65.61/32	10.2.65.61 – 10.2.65.61	10.2.65.61
63	10.2.65.62/32	10.2.65.62 – 10.2.65.62	10.2.65.62
64	10.2.65.63/32	10.2.65.63 – 10.2.65.63	10.2.65.63
65	10.2.65.64/32	10.2.65.64 – 10.2.65.64	10.2.65.64
66	10.2.65.65/32	10.2.65.65 – 10.2.65.65	10.2.65.65
67	10.2.65.66/32	10.2.65.66 – 10.2.65.66	10.2.65.66
68	10.2.65.67/32	10.2.65.67 – 10.2.65.67	10.2.65.67
69	10.2.65.68/32	10.2.65.68 – 10.2.65.68	10.2.65.68
70	10.2.65.69/32	10.2.65.69 – 10.2.65.69	10.2.65.69
71	10.2.65.70/32	10.2.65.70 – 10.2.65.70	10.2.65.70
72	10.2.65.71/32	10.2.65.71 – 10.2.65.71	10.2.65.71
73	10.2.65.72/32	10.2.65.72 – 10.2.65.72	10.2.65.72
74	10.2.65.73/32	10.2.65.73 – 10.2.65.73	10.2.65.73
75	10.2.65.74/32	10.2.65.74 – 10.2.65.74	10.2.65.74
76	10.2.65.75/32	10.2.65.75 – 10.2.65.75	10.2.65.75
77	10.2.65.76/32	10.2.65.76 – 10.2.65.76	10.2.65.76
78	10.2.65.77/32	10.2.65.77 – 10.2.65.77	10.2.65.77
79	10.2.65.78/32	10.2.65.78 – 10.2.65.78	10.2.65.78
80	10.2.65.79/32	10.2.65.79 – 10.2.65.79	10.2.65.79
81	10.2.65.80/32	10.2.65.80 – 10.2.65.80	10.2.65.80
82	10.2.65.81/32	10.2.65.81 – 10.2.65.81	10.2.65.81
83	10.2.65.82/32	10.2.65.82 – 10.2.65.82	10.2.65.82
84	10.2.65.83/32	10.2.65.83 – 10.2.65.83	10.2.65.83
85	10.2.65.84/32	10.2.65.84 – 10.2.65.84	10.2.65.84
86	10.2.65.85/32	10.2.65.85 – 10.2.65.85	10.2.65.85
87	10.2.65.86/32	10.2.65.86 – 10.2.65.86	10.2.65.86
88	10.2.65.87/32	10.2.65.87 – 10.2.65.87	10.2.65.87
89	10.2.65.88/32	10.2.65.88 – 10.2.65.88	10.2.65.88
90	10.2.65.89/32	10.2.65.89 – 10.2.65.89	10.2.65.89
91	10.2.65.90/32	10.2.65.90 – 10.2.65.90	10.2.65.90
92	10.2.65.91/32	10.2.65.91 – 10.2.65.91	10.2.65.91
93	10.2.65.92/32	10.2.65.92 – 10.2.65.92	10.2.65.92
94	10.2.65.93/32	10.2.65.93 – 10.2.65.93	10.2.65.93
95	10.2.65.94/32	10.2.65.94 – 10.2.65.94	10.2.65.94
96	10.2.65.95/32	10.2.65.95 – 10.2.65.95	10.2.65.95
97	10.2.65.96/32	10.2.65.96 – 10.2.65.96	10.2.65.96
98	10.2.65.97/32	10.2.65.97 – 10.2.65.97	10.2.65.97
99	10.2.65.98/32	10.2.65.98 – 10.2.65.98	10.2.65.98
100	10.2.65.99/32	10.2.65.99 – 10.2.65.99	10.2.65.99
101	10.2.65.100/32	10.2.65.100 – 10.2.65.100	10.2.65.100
102	10.2.65.101/32	10.2.65.101 – 10.2.65.101	10.2.65.101
103	10.2.65.102/32	10.2.65.102 – 10.2.65.102	10.2.65.102
104	10.2.65.103/32	10.2.65.103 – 10.2.65.103	10.2.65.103
105	10.2.65.104/32	10.2.65.104 – 10.2.65.104	10.2.65.104
106	10.2.65.105/32	10.2.65.105 – 10.2.65.105	10.2.65.105
107	10.2.65.106/32	10.2.65.106 – 10.2.65.106	10.2.65.106
108	10.2.65.107/32	10.2.65.107 – 10.2.65.107	10.2.65.107
109	10.2.65.108/32	10.2.65.108 – 10.2.65.108	10.2.65.108
110	10.2.65.109/32	10.2.65.109 – 10.2.65.109	10.2.65.109
111	10.2.65.110/32	10.2.65.110 – 10.2.65.110	10.2.65.110
112	10.2.65.111/32	10.2.65.111 – 10.2.65.111	10.2.65.111
113	10.2.65.112/32	10.2.65.112 – 10.2.65.112	10.2.65.112
114	10.2.65.113/32	10.2.65.113 – 10.2.65.113	10.2.65.113
115	10.2.65.114/32	10.2.65.114 – 10.2.65.114	10.2.65.114
116	10.2.65.115/32	10.2.65.115 – 10.2.65.115	10.2.65.115
117	10.2.65.116/32	10.2.65.116 – 10.2.65.116	10.2.65.116
118	10.2.65.117/32	10.2.65.117 – 10.2.65.117	10.2.65.117
119	10.2.65.118/32	10.2.65.118 – 10.2.65.118	10.2.65.118
120	10.2.65.119/32	10.2.65.119 – 10.2.65.119	10.2.65.119
121	10.2.65.120/32	10.2.65.120 – 10.2.65.120	10.2.65.120
122	10.2.65.121/32	10.2.65.121 – 10.2.65.121	10.2.65.121
123	10.2.65.122/32	10.2.65.122 – 10.2.65.122	10.2.65.122
124	10.2.65.123/32	10.2.65.123 – 10.2.65.123	10.2.65.123
125	10.2.65.124/32	10.2.65.124 – 10.2.65.124	10.2.65.124
126	10.2.65.125/32	10.2.65.125 – 10.2.65.125	10.2.65.125
127	10.2.65.126/32	10.2.65.126 – 10.2.65.126	10.2.65.126
128	10.2.65.127/32	10.2.65.127 – 10.2.65.127	10.2.65.127

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 →