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)10.6.85.0/25

network10.6.85.0/25

broadcast10.6.85.127

first host10.6.85.1

last host10.6.85.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.6.85.0/25

address00001010.00000110.01010101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000110.01010101.00000000

broadcast00001010.00000110.01010101.01111111

green = network part, grey = host part

hex0x0a065500

decimal168187136

reverse dns0.85.6.10.in-addr.arpa

ipv4-mapped::ffff:a06:5500

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.6.85.0/32	10.6.85.0 – 10.6.85.0	10.6.85.0
2	10.6.85.1/32	10.6.85.1 – 10.6.85.1	10.6.85.1
3	10.6.85.2/32	10.6.85.2 – 10.6.85.2	10.6.85.2
4	10.6.85.3/32	10.6.85.3 – 10.6.85.3	10.6.85.3
5	10.6.85.4/32	10.6.85.4 – 10.6.85.4	10.6.85.4
6	10.6.85.5/32	10.6.85.5 – 10.6.85.5	10.6.85.5
7	10.6.85.6/32	10.6.85.6 – 10.6.85.6	10.6.85.6
8	10.6.85.7/32	10.6.85.7 – 10.6.85.7	10.6.85.7
9	10.6.85.8/32	10.6.85.8 – 10.6.85.8	10.6.85.8
10	10.6.85.9/32	10.6.85.9 – 10.6.85.9	10.6.85.9
11	10.6.85.10/32	10.6.85.10 – 10.6.85.10	10.6.85.10
12	10.6.85.11/32	10.6.85.11 – 10.6.85.11	10.6.85.11
13	10.6.85.12/32	10.6.85.12 – 10.6.85.12	10.6.85.12
14	10.6.85.13/32	10.6.85.13 – 10.6.85.13	10.6.85.13
15	10.6.85.14/32	10.6.85.14 – 10.6.85.14	10.6.85.14
16	10.6.85.15/32	10.6.85.15 – 10.6.85.15	10.6.85.15
17	10.6.85.16/32	10.6.85.16 – 10.6.85.16	10.6.85.16
18	10.6.85.17/32	10.6.85.17 – 10.6.85.17	10.6.85.17
19	10.6.85.18/32	10.6.85.18 – 10.6.85.18	10.6.85.18
20	10.6.85.19/32	10.6.85.19 – 10.6.85.19	10.6.85.19
21	10.6.85.20/32	10.6.85.20 – 10.6.85.20	10.6.85.20
22	10.6.85.21/32	10.6.85.21 – 10.6.85.21	10.6.85.21
23	10.6.85.22/32	10.6.85.22 – 10.6.85.22	10.6.85.22
24	10.6.85.23/32	10.6.85.23 – 10.6.85.23	10.6.85.23
25	10.6.85.24/32	10.6.85.24 – 10.6.85.24	10.6.85.24
26	10.6.85.25/32	10.6.85.25 – 10.6.85.25	10.6.85.25
27	10.6.85.26/32	10.6.85.26 – 10.6.85.26	10.6.85.26
28	10.6.85.27/32	10.6.85.27 – 10.6.85.27	10.6.85.27
29	10.6.85.28/32	10.6.85.28 – 10.6.85.28	10.6.85.28
30	10.6.85.29/32	10.6.85.29 – 10.6.85.29	10.6.85.29
31	10.6.85.30/32	10.6.85.30 – 10.6.85.30	10.6.85.30
32	10.6.85.31/32	10.6.85.31 – 10.6.85.31	10.6.85.31
33	10.6.85.32/32	10.6.85.32 – 10.6.85.32	10.6.85.32
34	10.6.85.33/32	10.6.85.33 – 10.6.85.33	10.6.85.33
35	10.6.85.34/32	10.6.85.34 – 10.6.85.34	10.6.85.34
36	10.6.85.35/32	10.6.85.35 – 10.6.85.35	10.6.85.35
37	10.6.85.36/32	10.6.85.36 – 10.6.85.36	10.6.85.36
38	10.6.85.37/32	10.6.85.37 – 10.6.85.37	10.6.85.37
39	10.6.85.38/32	10.6.85.38 – 10.6.85.38	10.6.85.38
40	10.6.85.39/32	10.6.85.39 – 10.6.85.39	10.6.85.39
41	10.6.85.40/32	10.6.85.40 – 10.6.85.40	10.6.85.40
42	10.6.85.41/32	10.6.85.41 – 10.6.85.41	10.6.85.41
43	10.6.85.42/32	10.6.85.42 – 10.6.85.42	10.6.85.42
44	10.6.85.43/32	10.6.85.43 – 10.6.85.43	10.6.85.43
45	10.6.85.44/32	10.6.85.44 – 10.6.85.44	10.6.85.44
46	10.6.85.45/32	10.6.85.45 – 10.6.85.45	10.6.85.45
47	10.6.85.46/32	10.6.85.46 – 10.6.85.46	10.6.85.46
48	10.6.85.47/32	10.6.85.47 – 10.6.85.47	10.6.85.47
49	10.6.85.48/32	10.6.85.48 – 10.6.85.48	10.6.85.48
50	10.6.85.49/32	10.6.85.49 – 10.6.85.49	10.6.85.49
51	10.6.85.50/32	10.6.85.50 – 10.6.85.50	10.6.85.50
52	10.6.85.51/32	10.6.85.51 – 10.6.85.51	10.6.85.51
53	10.6.85.52/32	10.6.85.52 – 10.6.85.52	10.6.85.52
54	10.6.85.53/32	10.6.85.53 – 10.6.85.53	10.6.85.53
55	10.6.85.54/32	10.6.85.54 – 10.6.85.54	10.6.85.54
56	10.6.85.55/32	10.6.85.55 – 10.6.85.55	10.6.85.55
57	10.6.85.56/32	10.6.85.56 – 10.6.85.56	10.6.85.56
58	10.6.85.57/32	10.6.85.57 – 10.6.85.57	10.6.85.57
59	10.6.85.58/32	10.6.85.58 – 10.6.85.58	10.6.85.58
60	10.6.85.59/32	10.6.85.59 – 10.6.85.59	10.6.85.59
61	10.6.85.60/32	10.6.85.60 – 10.6.85.60	10.6.85.60
62	10.6.85.61/32	10.6.85.61 – 10.6.85.61	10.6.85.61
63	10.6.85.62/32	10.6.85.62 – 10.6.85.62	10.6.85.62
64	10.6.85.63/32	10.6.85.63 – 10.6.85.63	10.6.85.63
65	10.6.85.64/32	10.6.85.64 – 10.6.85.64	10.6.85.64
66	10.6.85.65/32	10.6.85.65 – 10.6.85.65	10.6.85.65
67	10.6.85.66/32	10.6.85.66 – 10.6.85.66	10.6.85.66
68	10.6.85.67/32	10.6.85.67 – 10.6.85.67	10.6.85.67
69	10.6.85.68/32	10.6.85.68 – 10.6.85.68	10.6.85.68
70	10.6.85.69/32	10.6.85.69 – 10.6.85.69	10.6.85.69
71	10.6.85.70/32	10.6.85.70 – 10.6.85.70	10.6.85.70
72	10.6.85.71/32	10.6.85.71 – 10.6.85.71	10.6.85.71
73	10.6.85.72/32	10.6.85.72 – 10.6.85.72	10.6.85.72
74	10.6.85.73/32	10.6.85.73 – 10.6.85.73	10.6.85.73
75	10.6.85.74/32	10.6.85.74 – 10.6.85.74	10.6.85.74
76	10.6.85.75/32	10.6.85.75 – 10.6.85.75	10.6.85.75
77	10.6.85.76/32	10.6.85.76 – 10.6.85.76	10.6.85.76
78	10.6.85.77/32	10.6.85.77 – 10.6.85.77	10.6.85.77
79	10.6.85.78/32	10.6.85.78 – 10.6.85.78	10.6.85.78
80	10.6.85.79/32	10.6.85.79 – 10.6.85.79	10.6.85.79
81	10.6.85.80/32	10.6.85.80 – 10.6.85.80	10.6.85.80
82	10.6.85.81/32	10.6.85.81 – 10.6.85.81	10.6.85.81
83	10.6.85.82/32	10.6.85.82 – 10.6.85.82	10.6.85.82
84	10.6.85.83/32	10.6.85.83 – 10.6.85.83	10.6.85.83
85	10.6.85.84/32	10.6.85.84 – 10.6.85.84	10.6.85.84
86	10.6.85.85/32	10.6.85.85 – 10.6.85.85	10.6.85.85
87	10.6.85.86/32	10.6.85.86 – 10.6.85.86	10.6.85.86
88	10.6.85.87/32	10.6.85.87 – 10.6.85.87	10.6.85.87
89	10.6.85.88/32	10.6.85.88 – 10.6.85.88	10.6.85.88
90	10.6.85.89/32	10.6.85.89 – 10.6.85.89	10.6.85.89
91	10.6.85.90/32	10.6.85.90 – 10.6.85.90	10.6.85.90
92	10.6.85.91/32	10.6.85.91 – 10.6.85.91	10.6.85.91
93	10.6.85.92/32	10.6.85.92 – 10.6.85.92	10.6.85.92
94	10.6.85.93/32	10.6.85.93 – 10.6.85.93	10.6.85.93
95	10.6.85.94/32	10.6.85.94 – 10.6.85.94	10.6.85.94
96	10.6.85.95/32	10.6.85.95 – 10.6.85.95	10.6.85.95
97	10.6.85.96/32	10.6.85.96 – 10.6.85.96	10.6.85.96
98	10.6.85.97/32	10.6.85.97 – 10.6.85.97	10.6.85.97
99	10.6.85.98/32	10.6.85.98 – 10.6.85.98	10.6.85.98
100	10.6.85.99/32	10.6.85.99 – 10.6.85.99	10.6.85.99
101	10.6.85.100/32	10.6.85.100 – 10.6.85.100	10.6.85.100
102	10.6.85.101/32	10.6.85.101 – 10.6.85.101	10.6.85.101
103	10.6.85.102/32	10.6.85.102 – 10.6.85.102	10.6.85.102
104	10.6.85.103/32	10.6.85.103 – 10.6.85.103	10.6.85.103
105	10.6.85.104/32	10.6.85.104 – 10.6.85.104	10.6.85.104
106	10.6.85.105/32	10.6.85.105 – 10.6.85.105	10.6.85.105
107	10.6.85.106/32	10.6.85.106 – 10.6.85.106	10.6.85.106
108	10.6.85.107/32	10.6.85.107 – 10.6.85.107	10.6.85.107
109	10.6.85.108/32	10.6.85.108 – 10.6.85.108	10.6.85.108
110	10.6.85.109/32	10.6.85.109 – 10.6.85.109	10.6.85.109
111	10.6.85.110/32	10.6.85.110 – 10.6.85.110	10.6.85.110
112	10.6.85.111/32	10.6.85.111 – 10.6.85.111	10.6.85.111
113	10.6.85.112/32	10.6.85.112 – 10.6.85.112	10.6.85.112
114	10.6.85.113/32	10.6.85.113 – 10.6.85.113	10.6.85.113
115	10.6.85.114/32	10.6.85.114 – 10.6.85.114	10.6.85.114
116	10.6.85.115/32	10.6.85.115 – 10.6.85.115	10.6.85.115
117	10.6.85.116/32	10.6.85.116 – 10.6.85.116	10.6.85.116
118	10.6.85.117/32	10.6.85.117 – 10.6.85.117	10.6.85.117
119	10.6.85.118/32	10.6.85.118 – 10.6.85.118	10.6.85.118
120	10.6.85.119/32	10.6.85.119 – 10.6.85.119	10.6.85.119
121	10.6.85.120/32	10.6.85.120 – 10.6.85.120	10.6.85.120
122	10.6.85.121/32	10.6.85.121 – 10.6.85.121	10.6.85.121
123	10.6.85.122/32	10.6.85.122 – 10.6.85.122	10.6.85.122
124	10.6.85.123/32	10.6.85.123 – 10.6.85.123	10.6.85.123
125	10.6.85.124/32	10.6.85.124 – 10.6.85.124	10.6.85.124
126	10.6.85.125/32	10.6.85.125 – 10.6.85.125	10.6.85.125
127	10.6.85.126/32	10.6.85.126 – 10.6.85.126	10.6.85.126
128	10.6.85.127/32	10.6.85.127 – 10.6.85.127	10.6.85.127

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 →