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)10.2.254.0/25

network10.2.254.0/25

broadcast10.2.254.127

first host10.2.254.1

last host10.2.254.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.254.0/25

address00001010.00000010.11111110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11111110.00000000

broadcast00001010.00000010.11111110.01111111

green = network part, grey = host part

hex0x0a02fe00

decimal167968256

reverse dns0.254.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:fe00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.254.0/32	10.2.254.0 – 10.2.254.0	10.2.254.0
2	10.2.254.1/32	10.2.254.1 – 10.2.254.1	10.2.254.1
3	10.2.254.2/32	10.2.254.2 – 10.2.254.2	10.2.254.2
4	10.2.254.3/32	10.2.254.3 – 10.2.254.3	10.2.254.3
5	10.2.254.4/32	10.2.254.4 – 10.2.254.4	10.2.254.4
6	10.2.254.5/32	10.2.254.5 – 10.2.254.5	10.2.254.5
7	10.2.254.6/32	10.2.254.6 – 10.2.254.6	10.2.254.6
8	10.2.254.7/32	10.2.254.7 – 10.2.254.7	10.2.254.7
9	10.2.254.8/32	10.2.254.8 – 10.2.254.8	10.2.254.8
10	10.2.254.9/32	10.2.254.9 – 10.2.254.9	10.2.254.9
11	10.2.254.10/32	10.2.254.10 – 10.2.254.10	10.2.254.10
12	10.2.254.11/32	10.2.254.11 – 10.2.254.11	10.2.254.11
13	10.2.254.12/32	10.2.254.12 – 10.2.254.12	10.2.254.12
14	10.2.254.13/32	10.2.254.13 – 10.2.254.13	10.2.254.13
15	10.2.254.14/32	10.2.254.14 – 10.2.254.14	10.2.254.14
16	10.2.254.15/32	10.2.254.15 – 10.2.254.15	10.2.254.15
17	10.2.254.16/32	10.2.254.16 – 10.2.254.16	10.2.254.16
18	10.2.254.17/32	10.2.254.17 – 10.2.254.17	10.2.254.17
19	10.2.254.18/32	10.2.254.18 – 10.2.254.18	10.2.254.18
20	10.2.254.19/32	10.2.254.19 – 10.2.254.19	10.2.254.19
21	10.2.254.20/32	10.2.254.20 – 10.2.254.20	10.2.254.20
22	10.2.254.21/32	10.2.254.21 – 10.2.254.21	10.2.254.21
23	10.2.254.22/32	10.2.254.22 – 10.2.254.22	10.2.254.22
24	10.2.254.23/32	10.2.254.23 – 10.2.254.23	10.2.254.23
25	10.2.254.24/32	10.2.254.24 – 10.2.254.24	10.2.254.24
26	10.2.254.25/32	10.2.254.25 – 10.2.254.25	10.2.254.25
27	10.2.254.26/32	10.2.254.26 – 10.2.254.26	10.2.254.26
28	10.2.254.27/32	10.2.254.27 – 10.2.254.27	10.2.254.27
29	10.2.254.28/32	10.2.254.28 – 10.2.254.28	10.2.254.28
30	10.2.254.29/32	10.2.254.29 – 10.2.254.29	10.2.254.29
31	10.2.254.30/32	10.2.254.30 – 10.2.254.30	10.2.254.30
32	10.2.254.31/32	10.2.254.31 – 10.2.254.31	10.2.254.31
33	10.2.254.32/32	10.2.254.32 – 10.2.254.32	10.2.254.32
34	10.2.254.33/32	10.2.254.33 – 10.2.254.33	10.2.254.33
35	10.2.254.34/32	10.2.254.34 – 10.2.254.34	10.2.254.34
36	10.2.254.35/32	10.2.254.35 – 10.2.254.35	10.2.254.35
37	10.2.254.36/32	10.2.254.36 – 10.2.254.36	10.2.254.36
38	10.2.254.37/32	10.2.254.37 – 10.2.254.37	10.2.254.37
39	10.2.254.38/32	10.2.254.38 – 10.2.254.38	10.2.254.38
40	10.2.254.39/32	10.2.254.39 – 10.2.254.39	10.2.254.39
41	10.2.254.40/32	10.2.254.40 – 10.2.254.40	10.2.254.40
42	10.2.254.41/32	10.2.254.41 – 10.2.254.41	10.2.254.41
43	10.2.254.42/32	10.2.254.42 – 10.2.254.42	10.2.254.42
44	10.2.254.43/32	10.2.254.43 – 10.2.254.43	10.2.254.43
45	10.2.254.44/32	10.2.254.44 – 10.2.254.44	10.2.254.44
46	10.2.254.45/32	10.2.254.45 – 10.2.254.45	10.2.254.45
47	10.2.254.46/32	10.2.254.46 – 10.2.254.46	10.2.254.46
48	10.2.254.47/32	10.2.254.47 – 10.2.254.47	10.2.254.47
49	10.2.254.48/32	10.2.254.48 – 10.2.254.48	10.2.254.48
50	10.2.254.49/32	10.2.254.49 – 10.2.254.49	10.2.254.49
51	10.2.254.50/32	10.2.254.50 – 10.2.254.50	10.2.254.50
52	10.2.254.51/32	10.2.254.51 – 10.2.254.51	10.2.254.51
53	10.2.254.52/32	10.2.254.52 – 10.2.254.52	10.2.254.52
54	10.2.254.53/32	10.2.254.53 – 10.2.254.53	10.2.254.53
55	10.2.254.54/32	10.2.254.54 – 10.2.254.54	10.2.254.54
56	10.2.254.55/32	10.2.254.55 – 10.2.254.55	10.2.254.55
57	10.2.254.56/32	10.2.254.56 – 10.2.254.56	10.2.254.56
58	10.2.254.57/32	10.2.254.57 – 10.2.254.57	10.2.254.57
59	10.2.254.58/32	10.2.254.58 – 10.2.254.58	10.2.254.58
60	10.2.254.59/32	10.2.254.59 – 10.2.254.59	10.2.254.59
61	10.2.254.60/32	10.2.254.60 – 10.2.254.60	10.2.254.60
62	10.2.254.61/32	10.2.254.61 – 10.2.254.61	10.2.254.61
63	10.2.254.62/32	10.2.254.62 – 10.2.254.62	10.2.254.62
64	10.2.254.63/32	10.2.254.63 – 10.2.254.63	10.2.254.63
65	10.2.254.64/32	10.2.254.64 – 10.2.254.64	10.2.254.64
66	10.2.254.65/32	10.2.254.65 – 10.2.254.65	10.2.254.65
67	10.2.254.66/32	10.2.254.66 – 10.2.254.66	10.2.254.66
68	10.2.254.67/32	10.2.254.67 – 10.2.254.67	10.2.254.67
69	10.2.254.68/32	10.2.254.68 – 10.2.254.68	10.2.254.68
70	10.2.254.69/32	10.2.254.69 – 10.2.254.69	10.2.254.69
71	10.2.254.70/32	10.2.254.70 – 10.2.254.70	10.2.254.70
72	10.2.254.71/32	10.2.254.71 – 10.2.254.71	10.2.254.71
73	10.2.254.72/32	10.2.254.72 – 10.2.254.72	10.2.254.72
74	10.2.254.73/32	10.2.254.73 – 10.2.254.73	10.2.254.73
75	10.2.254.74/32	10.2.254.74 – 10.2.254.74	10.2.254.74
76	10.2.254.75/32	10.2.254.75 – 10.2.254.75	10.2.254.75
77	10.2.254.76/32	10.2.254.76 – 10.2.254.76	10.2.254.76
78	10.2.254.77/32	10.2.254.77 – 10.2.254.77	10.2.254.77
79	10.2.254.78/32	10.2.254.78 – 10.2.254.78	10.2.254.78
80	10.2.254.79/32	10.2.254.79 – 10.2.254.79	10.2.254.79
81	10.2.254.80/32	10.2.254.80 – 10.2.254.80	10.2.254.80
82	10.2.254.81/32	10.2.254.81 – 10.2.254.81	10.2.254.81
83	10.2.254.82/32	10.2.254.82 – 10.2.254.82	10.2.254.82
84	10.2.254.83/32	10.2.254.83 – 10.2.254.83	10.2.254.83
85	10.2.254.84/32	10.2.254.84 – 10.2.254.84	10.2.254.84
86	10.2.254.85/32	10.2.254.85 – 10.2.254.85	10.2.254.85
87	10.2.254.86/32	10.2.254.86 – 10.2.254.86	10.2.254.86
88	10.2.254.87/32	10.2.254.87 – 10.2.254.87	10.2.254.87
89	10.2.254.88/32	10.2.254.88 – 10.2.254.88	10.2.254.88
90	10.2.254.89/32	10.2.254.89 – 10.2.254.89	10.2.254.89
91	10.2.254.90/32	10.2.254.90 – 10.2.254.90	10.2.254.90
92	10.2.254.91/32	10.2.254.91 – 10.2.254.91	10.2.254.91
93	10.2.254.92/32	10.2.254.92 – 10.2.254.92	10.2.254.92
94	10.2.254.93/32	10.2.254.93 – 10.2.254.93	10.2.254.93
95	10.2.254.94/32	10.2.254.94 – 10.2.254.94	10.2.254.94
96	10.2.254.95/32	10.2.254.95 – 10.2.254.95	10.2.254.95
97	10.2.254.96/32	10.2.254.96 – 10.2.254.96	10.2.254.96
98	10.2.254.97/32	10.2.254.97 – 10.2.254.97	10.2.254.97
99	10.2.254.98/32	10.2.254.98 – 10.2.254.98	10.2.254.98
100	10.2.254.99/32	10.2.254.99 – 10.2.254.99	10.2.254.99
101	10.2.254.100/32	10.2.254.100 – 10.2.254.100	10.2.254.100
102	10.2.254.101/32	10.2.254.101 – 10.2.254.101	10.2.254.101
103	10.2.254.102/32	10.2.254.102 – 10.2.254.102	10.2.254.102
104	10.2.254.103/32	10.2.254.103 – 10.2.254.103	10.2.254.103
105	10.2.254.104/32	10.2.254.104 – 10.2.254.104	10.2.254.104
106	10.2.254.105/32	10.2.254.105 – 10.2.254.105	10.2.254.105
107	10.2.254.106/32	10.2.254.106 – 10.2.254.106	10.2.254.106
108	10.2.254.107/32	10.2.254.107 – 10.2.254.107	10.2.254.107
109	10.2.254.108/32	10.2.254.108 – 10.2.254.108	10.2.254.108
110	10.2.254.109/32	10.2.254.109 – 10.2.254.109	10.2.254.109
111	10.2.254.110/32	10.2.254.110 – 10.2.254.110	10.2.254.110
112	10.2.254.111/32	10.2.254.111 – 10.2.254.111	10.2.254.111
113	10.2.254.112/32	10.2.254.112 – 10.2.254.112	10.2.254.112
114	10.2.254.113/32	10.2.254.113 – 10.2.254.113	10.2.254.113
115	10.2.254.114/32	10.2.254.114 – 10.2.254.114	10.2.254.114
116	10.2.254.115/32	10.2.254.115 – 10.2.254.115	10.2.254.115
117	10.2.254.116/32	10.2.254.116 – 10.2.254.116	10.2.254.116
118	10.2.254.117/32	10.2.254.117 – 10.2.254.117	10.2.254.117
119	10.2.254.118/32	10.2.254.118 – 10.2.254.118	10.2.254.118
120	10.2.254.119/32	10.2.254.119 – 10.2.254.119	10.2.254.119
121	10.2.254.120/32	10.2.254.120 – 10.2.254.120	10.2.254.120
122	10.2.254.121/32	10.2.254.121 – 10.2.254.121	10.2.254.121
123	10.2.254.122/32	10.2.254.122 – 10.2.254.122	10.2.254.122
124	10.2.254.123/32	10.2.254.123 – 10.2.254.123	10.2.254.123
125	10.2.254.124/32	10.2.254.124 – 10.2.254.124	10.2.254.124
126	10.2.254.125/32	10.2.254.125 – 10.2.254.125	10.2.254.125
127	10.2.254.126/32	10.2.254.126 – 10.2.254.126	10.2.254.126
128	10.2.254.127/32	10.2.254.127 – 10.2.254.127	10.2.254.127

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 →