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)10.2.176.0/25

network10.2.176.0/25

broadcast10.2.176.127

first host10.2.176.1

last host10.2.176.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.176.0/25

address00001010.00000010.10110000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110000.00000000

broadcast00001010.00000010.10110000.01111111

green = network part, grey = host part

hex0x0a02b000

decimal167948288

reverse dns0.176.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.176.0/32	10.2.176.0 – 10.2.176.0	10.2.176.0
2	10.2.176.1/32	10.2.176.1 – 10.2.176.1	10.2.176.1
3	10.2.176.2/32	10.2.176.2 – 10.2.176.2	10.2.176.2
4	10.2.176.3/32	10.2.176.3 – 10.2.176.3	10.2.176.3
5	10.2.176.4/32	10.2.176.4 – 10.2.176.4	10.2.176.4
6	10.2.176.5/32	10.2.176.5 – 10.2.176.5	10.2.176.5
7	10.2.176.6/32	10.2.176.6 – 10.2.176.6	10.2.176.6
8	10.2.176.7/32	10.2.176.7 – 10.2.176.7	10.2.176.7
9	10.2.176.8/32	10.2.176.8 – 10.2.176.8	10.2.176.8
10	10.2.176.9/32	10.2.176.9 – 10.2.176.9	10.2.176.9
11	10.2.176.10/32	10.2.176.10 – 10.2.176.10	10.2.176.10
12	10.2.176.11/32	10.2.176.11 – 10.2.176.11	10.2.176.11
13	10.2.176.12/32	10.2.176.12 – 10.2.176.12	10.2.176.12
14	10.2.176.13/32	10.2.176.13 – 10.2.176.13	10.2.176.13
15	10.2.176.14/32	10.2.176.14 – 10.2.176.14	10.2.176.14
16	10.2.176.15/32	10.2.176.15 – 10.2.176.15	10.2.176.15
17	10.2.176.16/32	10.2.176.16 – 10.2.176.16	10.2.176.16
18	10.2.176.17/32	10.2.176.17 – 10.2.176.17	10.2.176.17
19	10.2.176.18/32	10.2.176.18 – 10.2.176.18	10.2.176.18
20	10.2.176.19/32	10.2.176.19 – 10.2.176.19	10.2.176.19
21	10.2.176.20/32	10.2.176.20 – 10.2.176.20	10.2.176.20
22	10.2.176.21/32	10.2.176.21 – 10.2.176.21	10.2.176.21
23	10.2.176.22/32	10.2.176.22 – 10.2.176.22	10.2.176.22
24	10.2.176.23/32	10.2.176.23 – 10.2.176.23	10.2.176.23
25	10.2.176.24/32	10.2.176.24 – 10.2.176.24	10.2.176.24
26	10.2.176.25/32	10.2.176.25 – 10.2.176.25	10.2.176.25
27	10.2.176.26/32	10.2.176.26 – 10.2.176.26	10.2.176.26
28	10.2.176.27/32	10.2.176.27 – 10.2.176.27	10.2.176.27
29	10.2.176.28/32	10.2.176.28 – 10.2.176.28	10.2.176.28
30	10.2.176.29/32	10.2.176.29 – 10.2.176.29	10.2.176.29
31	10.2.176.30/32	10.2.176.30 – 10.2.176.30	10.2.176.30
32	10.2.176.31/32	10.2.176.31 – 10.2.176.31	10.2.176.31
33	10.2.176.32/32	10.2.176.32 – 10.2.176.32	10.2.176.32
34	10.2.176.33/32	10.2.176.33 – 10.2.176.33	10.2.176.33
35	10.2.176.34/32	10.2.176.34 – 10.2.176.34	10.2.176.34
36	10.2.176.35/32	10.2.176.35 – 10.2.176.35	10.2.176.35
37	10.2.176.36/32	10.2.176.36 – 10.2.176.36	10.2.176.36
38	10.2.176.37/32	10.2.176.37 – 10.2.176.37	10.2.176.37
39	10.2.176.38/32	10.2.176.38 – 10.2.176.38	10.2.176.38
40	10.2.176.39/32	10.2.176.39 – 10.2.176.39	10.2.176.39
41	10.2.176.40/32	10.2.176.40 – 10.2.176.40	10.2.176.40
42	10.2.176.41/32	10.2.176.41 – 10.2.176.41	10.2.176.41
43	10.2.176.42/32	10.2.176.42 – 10.2.176.42	10.2.176.42
44	10.2.176.43/32	10.2.176.43 – 10.2.176.43	10.2.176.43
45	10.2.176.44/32	10.2.176.44 – 10.2.176.44	10.2.176.44
46	10.2.176.45/32	10.2.176.45 – 10.2.176.45	10.2.176.45
47	10.2.176.46/32	10.2.176.46 – 10.2.176.46	10.2.176.46
48	10.2.176.47/32	10.2.176.47 – 10.2.176.47	10.2.176.47
49	10.2.176.48/32	10.2.176.48 – 10.2.176.48	10.2.176.48
50	10.2.176.49/32	10.2.176.49 – 10.2.176.49	10.2.176.49
51	10.2.176.50/32	10.2.176.50 – 10.2.176.50	10.2.176.50
52	10.2.176.51/32	10.2.176.51 – 10.2.176.51	10.2.176.51
53	10.2.176.52/32	10.2.176.52 – 10.2.176.52	10.2.176.52
54	10.2.176.53/32	10.2.176.53 – 10.2.176.53	10.2.176.53
55	10.2.176.54/32	10.2.176.54 – 10.2.176.54	10.2.176.54
56	10.2.176.55/32	10.2.176.55 – 10.2.176.55	10.2.176.55
57	10.2.176.56/32	10.2.176.56 – 10.2.176.56	10.2.176.56
58	10.2.176.57/32	10.2.176.57 – 10.2.176.57	10.2.176.57
59	10.2.176.58/32	10.2.176.58 – 10.2.176.58	10.2.176.58
60	10.2.176.59/32	10.2.176.59 – 10.2.176.59	10.2.176.59
61	10.2.176.60/32	10.2.176.60 – 10.2.176.60	10.2.176.60
62	10.2.176.61/32	10.2.176.61 – 10.2.176.61	10.2.176.61
63	10.2.176.62/32	10.2.176.62 – 10.2.176.62	10.2.176.62
64	10.2.176.63/32	10.2.176.63 – 10.2.176.63	10.2.176.63
65	10.2.176.64/32	10.2.176.64 – 10.2.176.64	10.2.176.64
66	10.2.176.65/32	10.2.176.65 – 10.2.176.65	10.2.176.65
67	10.2.176.66/32	10.2.176.66 – 10.2.176.66	10.2.176.66
68	10.2.176.67/32	10.2.176.67 – 10.2.176.67	10.2.176.67
69	10.2.176.68/32	10.2.176.68 – 10.2.176.68	10.2.176.68
70	10.2.176.69/32	10.2.176.69 – 10.2.176.69	10.2.176.69
71	10.2.176.70/32	10.2.176.70 – 10.2.176.70	10.2.176.70
72	10.2.176.71/32	10.2.176.71 – 10.2.176.71	10.2.176.71
73	10.2.176.72/32	10.2.176.72 – 10.2.176.72	10.2.176.72
74	10.2.176.73/32	10.2.176.73 – 10.2.176.73	10.2.176.73
75	10.2.176.74/32	10.2.176.74 – 10.2.176.74	10.2.176.74
76	10.2.176.75/32	10.2.176.75 – 10.2.176.75	10.2.176.75
77	10.2.176.76/32	10.2.176.76 – 10.2.176.76	10.2.176.76
78	10.2.176.77/32	10.2.176.77 – 10.2.176.77	10.2.176.77
79	10.2.176.78/32	10.2.176.78 – 10.2.176.78	10.2.176.78
80	10.2.176.79/32	10.2.176.79 – 10.2.176.79	10.2.176.79
81	10.2.176.80/32	10.2.176.80 – 10.2.176.80	10.2.176.80
82	10.2.176.81/32	10.2.176.81 – 10.2.176.81	10.2.176.81
83	10.2.176.82/32	10.2.176.82 – 10.2.176.82	10.2.176.82
84	10.2.176.83/32	10.2.176.83 – 10.2.176.83	10.2.176.83
85	10.2.176.84/32	10.2.176.84 – 10.2.176.84	10.2.176.84
86	10.2.176.85/32	10.2.176.85 – 10.2.176.85	10.2.176.85
87	10.2.176.86/32	10.2.176.86 – 10.2.176.86	10.2.176.86
88	10.2.176.87/32	10.2.176.87 – 10.2.176.87	10.2.176.87
89	10.2.176.88/32	10.2.176.88 – 10.2.176.88	10.2.176.88
90	10.2.176.89/32	10.2.176.89 – 10.2.176.89	10.2.176.89
91	10.2.176.90/32	10.2.176.90 – 10.2.176.90	10.2.176.90
92	10.2.176.91/32	10.2.176.91 – 10.2.176.91	10.2.176.91
93	10.2.176.92/32	10.2.176.92 – 10.2.176.92	10.2.176.92
94	10.2.176.93/32	10.2.176.93 – 10.2.176.93	10.2.176.93
95	10.2.176.94/32	10.2.176.94 – 10.2.176.94	10.2.176.94
96	10.2.176.95/32	10.2.176.95 – 10.2.176.95	10.2.176.95
97	10.2.176.96/32	10.2.176.96 – 10.2.176.96	10.2.176.96
98	10.2.176.97/32	10.2.176.97 – 10.2.176.97	10.2.176.97
99	10.2.176.98/32	10.2.176.98 – 10.2.176.98	10.2.176.98
100	10.2.176.99/32	10.2.176.99 – 10.2.176.99	10.2.176.99
101	10.2.176.100/32	10.2.176.100 – 10.2.176.100	10.2.176.100
102	10.2.176.101/32	10.2.176.101 – 10.2.176.101	10.2.176.101
103	10.2.176.102/32	10.2.176.102 – 10.2.176.102	10.2.176.102
104	10.2.176.103/32	10.2.176.103 – 10.2.176.103	10.2.176.103
105	10.2.176.104/32	10.2.176.104 – 10.2.176.104	10.2.176.104
106	10.2.176.105/32	10.2.176.105 – 10.2.176.105	10.2.176.105
107	10.2.176.106/32	10.2.176.106 – 10.2.176.106	10.2.176.106
108	10.2.176.107/32	10.2.176.107 – 10.2.176.107	10.2.176.107
109	10.2.176.108/32	10.2.176.108 – 10.2.176.108	10.2.176.108
110	10.2.176.109/32	10.2.176.109 – 10.2.176.109	10.2.176.109
111	10.2.176.110/32	10.2.176.110 – 10.2.176.110	10.2.176.110
112	10.2.176.111/32	10.2.176.111 – 10.2.176.111	10.2.176.111
113	10.2.176.112/32	10.2.176.112 – 10.2.176.112	10.2.176.112
114	10.2.176.113/32	10.2.176.113 – 10.2.176.113	10.2.176.113
115	10.2.176.114/32	10.2.176.114 – 10.2.176.114	10.2.176.114
116	10.2.176.115/32	10.2.176.115 – 10.2.176.115	10.2.176.115
117	10.2.176.116/32	10.2.176.116 – 10.2.176.116	10.2.176.116
118	10.2.176.117/32	10.2.176.117 – 10.2.176.117	10.2.176.117
119	10.2.176.118/32	10.2.176.118 – 10.2.176.118	10.2.176.118
120	10.2.176.119/32	10.2.176.119 – 10.2.176.119	10.2.176.119
121	10.2.176.120/32	10.2.176.120 – 10.2.176.120	10.2.176.120
122	10.2.176.121/32	10.2.176.121 – 10.2.176.121	10.2.176.121
123	10.2.176.122/32	10.2.176.122 – 10.2.176.122	10.2.176.122
124	10.2.176.123/32	10.2.176.123 – 10.2.176.123	10.2.176.123
125	10.2.176.124/32	10.2.176.124 – 10.2.176.124	10.2.176.124
126	10.2.176.125/32	10.2.176.125 – 10.2.176.125	10.2.176.125
127	10.2.176.126/32	10.2.176.126 – 10.2.176.126	10.2.176.126
128	10.2.176.127/32	10.2.176.127 – 10.2.176.127	10.2.176.127

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 →