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)10.99.75.0/25

network10.99.75.0/25

broadcast10.99.75.127

first host10.99.75.1

last host10.99.75.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.99.75.0/25

address00001010.01100011.01001011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01100011.01001011.00000000

broadcast00001010.01100011.01001011.01111111

green = network part, grey = host part

hex0x0a634b00

decimal174279424

reverse dns0.75.99.10.in-addr.arpa

ipv4-mapped::ffff:a63:4b00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.99.75.0/32	10.99.75.0 – 10.99.75.0	10.99.75.0
2	10.99.75.1/32	10.99.75.1 – 10.99.75.1	10.99.75.1
3	10.99.75.2/32	10.99.75.2 – 10.99.75.2	10.99.75.2
4	10.99.75.3/32	10.99.75.3 – 10.99.75.3	10.99.75.3
5	10.99.75.4/32	10.99.75.4 – 10.99.75.4	10.99.75.4
6	10.99.75.5/32	10.99.75.5 – 10.99.75.5	10.99.75.5
7	10.99.75.6/32	10.99.75.6 – 10.99.75.6	10.99.75.6
8	10.99.75.7/32	10.99.75.7 – 10.99.75.7	10.99.75.7
9	10.99.75.8/32	10.99.75.8 – 10.99.75.8	10.99.75.8
10	10.99.75.9/32	10.99.75.9 – 10.99.75.9	10.99.75.9
11	10.99.75.10/32	10.99.75.10 – 10.99.75.10	10.99.75.10
12	10.99.75.11/32	10.99.75.11 – 10.99.75.11	10.99.75.11
13	10.99.75.12/32	10.99.75.12 – 10.99.75.12	10.99.75.12
14	10.99.75.13/32	10.99.75.13 – 10.99.75.13	10.99.75.13
15	10.99.75.14/32	10.99.75.14 – 10.99.75.14	10.99.75.14
16	10.99.75.15/32	10.99.75.15 – 10.99.75.15	10.99.75.15
17	10.99.75.16/32	10.99.75.16 – 10.99.75.16	10.99.75.16
18	10.99.75.17/32	10.99.75.17 – 10.99.75.17	10.99.75.17
19	10.99.75.18/32	10.99.75.18 – 10.99.75.18	10.99.75.18
20	10.99.75.19/32	10.99.75.19 – 10.99.75.19	10.99.75.19
21	10.99.75.20/32	10.99.75.20 – 10.99.75.20	10.99.75.20
22	10.99.75.21/32	10.99.75.21 – 10.99.75.21	10.99.75.21
23	10.99.75.22/32	10.99.75.22 – 10.99.75.22	10.99.75.22
24	10.99.75.23/32	10.99.75.23 – 10.99.75.23	10.99.75.23
25	10.99.75.24/32	10.99.75.24 – 10.99.75.24	10.99.75.24
26	10.99.75.25/32	10.99.75.25 – 10.99.75.25	10.99.75.25
27	10.99.75.26/32	10.99.75.26 – 10.99.75.26	10.99.75.26
28	10.99.75.27/32	10.99.75.27 – 10.99.75.27	10.99.75.27
29	10.99.75.28/32	10.99.75.28 – 10.99.75.28	10.99.75.28
30	10.99.75.29/32	10.99.75.29 – 10.99.75.29	10.99.75.29
31	10.99.75.30/32	10.99.75.30 – 10.99.75.30	10.99.75.30
32	10.99.75.31/32	10.99.75.31 – 10.99.75.31	10.99.75.31
33	10.99.75.32/32	10.99.75.32 – 10.99.75.32	10.99.75.32
34	10.99.75.33/32	10.99.75.33 – 10.99.75.33	10.99.75.33
35	10.99.75.34/32	10.99.75.34 – 10.99.75.34	10.99.75.34
36	10.99.75.35/32	10.99.75.35 – 10.99.75.35	10.99.75.35
37	10.99.75.36/32	10.99.75.36 – 10.99.75.36	10.99.75.36
38	10.99.75.37/32	10.99.75.37 – 10.99.75.37	10.99.75.37
39	10.99.75.38/32	10.99.75.38 – 10.99.75.38	10.99.75.38
40	10.99.75.39/32	10.99.75.39 – 10.99.75.39	10.99.75.39
41	10.99.75.40/32	10.99.75.40 – 10.99.75.40	10.99.75.40
42	10.99.75.41/32	10.99.75.41 – 10.99.75.41	10.99.75.41
43	10.99.75.42/32	10.99.75.42 – 10.99.75.42	10.99.75.42
44	10.99.75.43/32	10.99.75.43 – 10.99.75.43	10.99.75.43
45	10.99.75.44/32	10.99.75.44 – 10.99.75.44	10.99.75.44
46	10.99.75.45/32	10.99.75.45 – 10.99.75.45	10.99.75.45
47	10.99.75.46/32	10.99.75.46 – 10.99.75.46	10.99.75.46
48	10.99.75.47/32	10.99.75.47 – 10.99.75.47	10.99.75.47
49	10.99.75.48/32	10.99.75.48 – 10.99.75.48	10.99.75.48
50	10.99.75.49/32	10.99.75.49 – 10.99.75.49	10.99.75.49
51	10.99.75.50/32	10.99.75.50 – 10.99.75.50	10.99.75.50
52	10.99.75.51/32	10.99.75.51 – 10.99.75.51	10.99.75.51
53	10.99.75.52/32	10.99.75.52 – 10.99.75.52	10.99.75.52
54	10.99.75.53/32	10.99.75.53 – 10.99.75.53	10.99.75.53
55	10.99.75.54/32	10.99.75.54 – 10.99.75.54	10.99.75.54
56	10.99.75.55/32	10.99.75.55 – 10.99.75.55	10.99.75.55
57	10.99.75.56/32	10.99.75.56 – 10.99.75.56	10.99.75.56
58	10.99.75.57/32	10.99.75.57 – 10.99.75.57	10.99.75.57
59	10.99.75.58/32	10.99.75.58 – 10.99.75.58	10.99.75.58
60	10.99.75.59/32	10.99.75.59 – 10.99.75.59	10.99.75.59
61	10.99.75.60/32	10.99.75.60 – 10.99.75.60	10.99.75.60
62	10.99.75.61/32	10.99.75.61 – 10.99.75.61	10.99.75.61
63	10.99.75.62/32	10.99.75.62 – 10.99.75.62	10.99.75.62
64	10.99.75.63/32	10.99.75.63 – 10.99.75.63	10.99.75.63
65	10.99.75.64/32	10.99.75.64 – 10.99.75.64	10.99.75.64
66	10.99.75.65/32	10.99.75.65 – 10.99.75.65	10.99.75.65
67	10.99.75.66/32	10.99.75.66 – 10.99.75.66	10.99.75.66
68	10.99.75.67/32	10.99.75.67 – 10.99.75.67	10.99.75.67
69	10.99.75.68/32	10.99.75.68 – 10.99.75.68	10.99.75.68
70	10.99.75.69/32	10.99.75.69 – 10.99.75.69	10.99.75.69
71	10.99.75.70/32	10.99.75.70 – 10.99.75.70	10.99.75.70
72	10.99.75.71/32	10.99.75.71 – 10.99.75.71	10.99.75.71
73	10.99.75.72/32	10.99.75.72 – 10.99.75.72	10.99.75.72
74	10.99.75.73/32	10.99.75.73 – 10.99.75.73	10.99.75.73
75	10.99.75.74/32	10.99.75.74 – 10.99.75.74	10.99.75.74
76	10.99.75.75/32	10.99.75.75 – 10.99.75.75	10.99.75.75
77	10.99.75.76/32	10.99.75.76 – 10.99.75.76	10.99.75.76
78	10.99.75.77/32	10.99.75.77 – 10.99.75.77	10.99.75.77
79	10.99.75.78/32	10.99.75.78 – 10.99.75.78	10.99.75.78
80	10.99.75.79/32	10.99.75.79 – 10.99.75.79	10.99.75.79
81	10.99.75.80/32	10.99.75.80 – 10.99.75.80	10.99.75.80
82	10.99.75.81/32	10.99.75.81 – 10.99.75.81	10.99.75.81
83	10.99.75.82/32	10.99.75.82 – 10.99.75.82	10.99.75.82
84	10.99.75.83/32	10.99.75.83 – 10.99.75.83	10.99.75.83
85	10.99.75.84/32	10.99.75.84 – 10.99.75.84	10.99.75.84
86	10.99.75.85/32	10.99.75.85 – 10.99.75.85	10.99.75.85
87	10.99.75.86/32	10.99.75.86 – 10.99.75.86	10.99.75.86
88	10.99.75.87/32	10.99.75.87 – 10.99.75.87	10.99.75.87
89	10.99.75.88/32	10.99.75.88 – 10.99.75.88	10.99.75.88
90	10.99.75.89/32	10.99.75.89 – 10.99.75.89	10.99.75.89
91	10.99.75.90/32	10.99.75.90 – 10.99.75.90	10.99.75.90
92	10.99.75.91/32	10.99.75.91 – 10.99.75.91	10.99.75.91
93	10.99.75.92/32	10.99.75.92 – 10.99.75.92	10.99.75.92
94	10.99.75.93/32	10.99.75.93 – 10.99.75.93	10.99.75.93
95	10.99.75.94/32	10.99.75.94 – 10.99.75.94	10.99.75.94
96	10.99.75.95/32	10.99.75.95 – 10.99.75.95	10.99.75.95
97	10.99.75.96/32	10.99.75.96 – 10.99.75.96	10.99.75.96
98	10.99.75.97/32	10.99.75.97 – 10.99.75.97	10.99.75.97
99	10.99.75.98/32	10.99.75.98 – 10.99.75.98	10.99.75.98
100	10.99.75.99/32	10.99.75.99 – 10.99.75.99	10.99.75.99
101	10.99.75.100/32	10.99.75.100 – 10.99.75.100	10.99.75.100
102	10.99.75.101/32	10.99.75.101 – 10.99.75.101	10.99.75.101
103	10.99.75.102/32	10.99.75.102 – 10.99.75.102	10.99.75.102
104	10.99.75.103/32	10.99.75.103 – 10.99.75.103	10.99.75.103
105	10.99.75.104/32	10.99.75.104 – 10.99.75.104	10.99.75.104
106	10.99.75.105/32	10.99.75.105 – 10.99.75.105	10.99.75.105
107	10.99.75.106/32	10.99.75.106 – 10.99.75.106	10.99.75.106
108	10.99.75.107/32	10.99.75.107 – 10.99.75.107	10.99.75.107
109	10.99.75.108/32	10.99.75.108 – 10.99.75.108	10.99.75.108
110	10.99.75.109/32	10.99.75.109 – 10.99.75.109	10.99.75.109
111	10.99.75.110/32	10.99.75.110 – 10.99.75.110	10.99.75.110
112	10.99.75.111/32	10.99.75.111 – 10.99.75.111	10.99.75.111
113	10.99.75.112/32	10.99.75.112 – 10.99.75.112	10.99.75.112
114	10.99.75.113/32	10.99.75.113 – 10.99.75.113	10.99.75.113
115	10.99.75.114/32	10.99.75.114 – 10.99.75.114	10.99.75.114
116	10.99.75.115/32	10.99.75.115 – 10.99.75.115	10.99.75.115
117	10.99.75.116/32	10.99.75.116 – 10.99.75.116	10.99.75.116
118	10.99.75.117/32	10.99.75.117 – 10.99.75.117	10.99.75.117
119	10.99.75.118/32	10.99.75.118 – 10.99.75.118	10.99.75.118
120	10.99.75.119/32	10.99.75.119 – 10.99.75.119	10.99.75.119
121	10.99.75.120/32	10.99.75.120 – 10.99.75.120	10.99.75.120
122	10.99.75.121/32	10.99.75.121 – 10.99.75.121	10.99.75.121
123	10.99.75.122/32	10.99.75.122 – 10.99.75.122	10.99.75.122
124	10.99.75.123/32	10.99.75.123 – 10.99.75.123	10.99.75.123
125	10.99.75.124/32	10.99.75.124 – 10.99.75.124	10.99.75.124
126	10.99.75.125/32	10.99.75.125 – 10.99.75.125	10.99.75.125
127	10.99.75.126/32	10.99.75.126 – 10.99.75.126	10.99.75.126
128	10.99.75.127/32	10.99.75.127 – 10.99.75.127	10.99.75.127

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 →