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)10.2.149.0/25

network10.2.149.0/25

broadcast10.2.149.127

first host10.2.149.1

last host10.2.149.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.149.0/25

address00001010.00000010.10010101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10010101.00000000

broadcast00001010.00000010.10010101.01111111

green = network part, grey = host part

hex0x0a029500

decimal167941376

reverse dns0.149.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9500

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.149.0/32	10.2.149.0 – 10.2.149.0	10.2.149.0
2	10.2.149.1/32	10.2.149.1 – 10.2.149.1	10.2.149.1
3	10.2.149.2/32	10.2.149.2 – 10.2.149.2	10.2.149.2
4	10.2.149.3/32	10.2.149.3 – 10.2.149.3	10.2.149.3
5	10.2.149.4/32	10.2.149.4 – 10.2.149.4	10.2.149.4
6	10.2.149.5/32	10.2.149.5 – 10.2.149.5	10.2.149.5
7	10.2.149.6/32	10.2.149.6 – 10.2.149.6	10.2.149.6
8	10.2.149.7/32	10.2.149.7 – 10.2.149.7	10.2.149.7
9	10.2.149.8/32	10.2.149.8 – 10.2.149.8	10.2.149.8
10	10.2.149.9/32	10.2.149.9 – 10.2.149.9	10.2.149.9
11	10.2.149.10/32	10.2.149.10 – 10.2.149.10	10.2.149.10
12	10.2.149.11/32	10.2.149.11 – 10.2.149.11	10.2.149.11
13	10.2.149.12/32	10.2.149.12 – 10.2.149.12	10.2.149.12
14	10.2.149.13/32	10.2.149.13 – 10.2.149.13	10.2.149.13
15	10.2.149.14/32	10.2.149.14 – 10.2.149.14	10.2.149.14
16	10.2.149.15/32	10.2.149.15 – 10.2.149.15	10.2.149.15
17	10.2.149.16/32	10.2.149.16 – 10.2.149.16	10.2.149.16
18	10.2.149.17/32	10.2.149.17 – 10.2.149.17	10.2.149.17
19	10.2.149.18/32	10.2.149.18 – 10.2.149.18	10.2.149.18
20	10.2.149.19/32	10.2.149.19 – 10.2.149.19	10.2.149.19
21	10.2.149.20/32	10.2.149.20 – 10.2.149.20	10.2.149.20
22	10.2.149.21/32	10.2.149.21 – 10.2.149.21	10.2.149.21
23	10.2.149.22/32	10.2.149.22 – 10.2.149.22	10.2.149.22
24	10.2.149.23/32	10.2.149.23 – 10.2.149.23	10.2.149.23
25	10.2.149.24/32	10.2.149.24 – 10.2.149.24	10.2.149.24
26	10.2.149.25/32	10.2.149.25 – 10.2.149.25	10.2.149.25
27	10.2.149.26/32	10.2.149.26 – 10.2.149.26	10.2.149.26
28	10.2.149.27/32	10.2.149.27 – 10.2.149.27	10.2.149.27
29	10.2.149.28/32	10.2.149.28 – 10.2.149.28	10.2.149.28
30	10.2.149.29/32	10.2.149.29 – 10.2.149.29	10.2.149.29
31	10.2.149.30/32	10.2.149.30 – 10.2.149.30	10.2.149.30
32	10.2.149.31/32	10.2.149.31 – 10.2.149.31	10.2.149.31
33	10.2.149.32/32	10.2.149.32 – 10.2.149.32	10.2.149.32
34	10.2.149.33/32	10.2.149.33 – 10.2.149.33	10.2.149.33
35	10.2.149.34/32	10.2.149.34 – 10.2.149.34	10.2.149.34
36	10.2.149.35/32	10.2.149.35 – 10.2.149.35	10.2.149.35
37	10.2.149.36/32	10.2.149.36 – 10.2.149.36	10.2.149.36
38	10.2.149.37/32	10.2.149.37 – 10.2.149.37	10.2.149.37
39	10.2.149.38/32	10.2.149.38 – 10.2.149.38	10.2.149.38
40	10.2.149.39/32	10.2.149.39 – 10.2.149.39	10.2.149.39
41	10.2.149.40/32	10.2.149.40 – 10.2.149.40	10.2.149.40
42	10.2.149.41/32	10.2.149.41 – 10.2.149.41	10.2.149.41
43	10.2.149.42/32	10.2.149.42 – 10.2.149.42	10.2.149.42
44	10.2.149.43/32	10.2.149.43 – 10.2.149.43	10.2.149.43
45	10.2.149.44/32	10.2.149.44 – 10.2.149.44	10.2.149.44
46	10.2.149.45/32	10.2.149.45 – 10.2.149.45	10.2.149.45
47	10.2.149.46/32	10.2.149.46 – 10.2.149.46	10.2.149.46
48	10.2.149.47/32	10.2.149.47 – 10.2.149.47	10.2.149.47
49	10.2.149.48/32	10.2.149.48 – 10.2.149.48	10.2.149.48
50	10.2.149.49/32	10.2.149.49 – 10.2.149.49	10.2.149.49
51	10.2.149.50/32	10.2.149.50 – 10.2.149.50	10.2.149.50
52	10.2.149.51/32	10.2.149.51 – 10.2.149.51	10.2.149.51
53	10.2.149.52/32	10.2.149.52 – 10.2.149.52	10.2.149.52
54	10.2.149.53/32	10.2.149.53 – 10.2.149.53	10.2.149.53
55	10.2.149.54/32	10.2.149.54 – 10.2.149.54	10.2.149.54
56	10.2.149.55/32	10.2.149.55 – 10.2.149.55	10.2.149.55
57	10.2.149.56/32	10.2.149.56 – 10.2.149.56	10.2.149.56
58	10.2.149.57/32	10.2.149.57 – 10.2.149.57	10.2.149.57
59	10.2.149.58/32	10.2.149.58 – 10.2.149.58	10.2.149.58
60	10.2.149.59/32	10.2.149.59 – 10.2.149.59	10.2.149.59
61	10.2.149.60/32	10.2.149.60 – 10.2.149.60	10.2.149.60
62	10.2.149.61/32	10.2.149.61 – 10.2.149.61	10.2.149.61
63	10.2.149.62/32	10.2.149.62 – 10.2.149.62	10.2.149.62
64	10.2.149.63/32	10.2.149.63 – 10.2.149.63	10.2.149.63
65	10.2.149.64/32	10.2.149.64 – 10.2.149.64	10.2.149.64
66	10.2.149.65/32	10.2.149.65 – 10.2.149.65	10.2.149.65
67	10.2.149.66/32	10.2.149.66 – 10.2.149.66	10.2.149.66
68	10.2.149.67/32	10.2.149.67 – 10.2.149.67	10.2.149.67
69	10.2.149.68/32	10.2.149.68 – 10.2.149.68	10.2.149.68
70	10.2.149.69/32	10.2.149.69 – 10.2.149.69	10.2.149.69
71	10.2.149.70/32	10.2.149.70 – 10.2.149.70	10.2.149.70
72	10.2.149.71/32	10.2.149.71 – 10.2.149.71	10.2.149.71
73	10.2.149.72/32	10.2.149.72 – 10.2.149.72	10.2.149.72
74	10.2.149.73/32	10.2.149.73 – 10.2.149.73	10.2.149.73
75	10.2.149.74/32	10.2.149.74 – 10.2.149.74	10.2.149.74
76	10.2.149.75/32	10.2.149.75 – 10.2.149.75	10.2.149.75
77	10.2.149.76/32	10.2.149.76 – 10.2.149.76	10.2.149.76
78	10.2.149.77/32	10.2.149.77 – 10.2.149.77	10.2.149.77
79	10.2.149.78/32	10.2.149.78 – 10.2.149.78	10.2.149.78
80	10.2.149.79/32	10.2.149.79 – 10.2.149.79	10.2.149.79
81	10.2.149.80/32	10.2.149.80 – 10.2.149.80	10.2.149.80
82	10.2.149.81/32	10.2.149.81 – 10.2.149.81	10.2.149.81
83	10.2.149.82/32	10.2.149.82 – 10.2.149.82	10.2.149.82
84	10.2.149.83/32	10.2.149.83 – 10.2.149.83	10.2.149.83
85	10.2.149.84/32	10.2.149.84 – 10.2.149.84	10.2.149.84
86	10.2.149.85/32	10.2.149.85 – 10.2.149.85	10.2.149.85
87	10.2.149.86/32	10.2.149.86 – 10.2.149.86	10.2.149.86
88	10.2.149.87/32	10.2.149.87 – 10.2.149.87	10.2.149.87
89	10.2.149.88/32	10.2.149.88 – 10.2.149.88	10.2.149.88
90	10.2.149.89/32	10.2.149.89 – 10.2.149.89	10.2.149.89
91	10.2.149.90/32	10.2.149.90 – 10.2.149.90	10.2.149.90
92	10.2.149.91/32	10.2.149.91 – 10.2.149.91	10.2.149.91
93	10.2.149.92/32	10.2.149.92 – 10.2.149.92	10.2.149.92
94	10.2.149.93/32	10.2.149.93 – 10.2.149.93	10.2.149.93
95	10.2.149.94/32	10.2.149.94 – 10.2.149.94	10.2.149.94
96	10.2.149.95/32	10.2.149.95 – 10.2.149.95	10.2.149.95
97	10.2.149.96/32	10.2.149.96 – 10.2.149.96	10.2.149.96
98	10.2.149.97/32	10.2.149.97 – 10.2.149.97	10.2.149.97
99	10.2.149.98/32	10.2.149.98 – 10.2.149.98	10.2.149.98
100	10.2.149.99/32	10.2.149.99 – 10.2.149.99	10.2.149.99
101	10.2.149.100/32	10.2.149.100 – 10.2.149.100	10.2.149.100
102	10.2.149.101/32	10.2.149.101 – 10.2.149.101	10.2.149.101
103	10.2.149.102/32	10.2.149.102 – 10.2.149.102	10.2.149.102
104	10.2.149.103/32	10.2.149.103 – 10.2.149.103	10.2.149.103
105	10.2.149.104/32	10.2.149.104 – 10.2.149.104	10.2.149.104
106	10.2.149.105/32	10.2.149.105 – 10.2.149.105	10.2.149.105
107	10.2.149.106/32	10.2.149.106 – 10.2.149.106	10.2.149.106
108	10.2.149.107/32	10.2.149.107 – 10.2.149.107	10.2.149.107
109	10.2.149.108/32	10.2.149.108 – 10.2.149.108	10.2.149.108
110	10.2.149.109/32	10.2.149.109 – 10.2.149.109	10.2.149.109
111	10.2.149.110/32	10.2.149.110 – 10.2.149.110	10.2.149.110
112	10.2.149.111/32	10.2.149.111 – 10.2.149.111	10.2.149.111
113	10.2.149.112/32	10.2.149.112 – 10.2.149.112	10.2.149.112
114	10.2.149.113/32	10.2.149.113 – 10.2.149.113	10.2.149.113
115	10.2.149.114/32	10.2.149.114 – 10.2.149.114	10.2.149.114
116	10.2.149.115/32	10.2.149.115 – 10.2.149.115	10.2.149.115
117	10.2.149.116/32	10.2.149.116 – 10.2.149.116	10.2.149.116
118	10.2.149.117/32	10.2.149.117 – 10.2.149.117	10.2.149.117
119	10.2.149.118/32	10.2.149.118 – 10.2.149.118	10.2.149.118
120	10.2.149.119/32	10.2.149.119 – 10.2.149.119	10.2.149.119
121	10.2.149.120/32	10.2.149.120 – 10.2.149.120	10.2.149.120
122	10.2.149.121/32	10.2.149.121 – 10.2.149.121	10.2.149.121
123	10.2.149.122/32	10.2.149.122 – 10.2.149.122	10.2.149.122
124	10.2.149.123/32	10.2.149.123 – 10.2.149.123	10.2.149.123
125	10.2.149.124/32	10.2.149.124 – 10.2.149.124	10.2.149.124
126	10.2.149.125/32	10.2.149.125 – 10.2.149.125	10.2.149.125
127	10.2.149.126/32	10.2.149.126 – 10.2.149.126	10.2.149.126
128	10.2.149.127/32	10.2.149.127 – 10.2.149.127	10.2.149.127

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 →