How many dynamically assigned mac addresses can a hyper-v server provide by default?

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OUIs registered by Microsoft Corp
Detection Rule 1
Virtual Machine’s MAC ranges
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Frequently asked questions

Summary

#	Range or Prefix	Vendor	Virtual Machine

1	00:15:5d	Microsoft	Hyper-V

OUIs registered by Microsoft Corp

There are 41 OUI registered by Microsoft Corp:

OUI	Assignment Type

70:BC:10	MA-L
B8:31:B5	MA-L
F0:6E:0B	MA-L
CA:12:5C	MA-L
F0:1D:BC	MA-L
EC:83:50	MA-L
EC:59:E7	MA-L
D4:8F:33	MA-L
D0:92:9E	MA-L
C8:3F:26	MA-L
C4:9D:ED	MA-L
BC:83:85	MA-L
B8:4F:D5	MA-L
9C:AA:1B	MA-L
9C:6C:15	MA-L
98:5F:D3	MA-L
94:9A:A9	MA-L
84:63:D6	MA-L
80:C5:E6	MA-L
74:E2:8C	MA-L
5C:BA:37	MA-L
48:86:E8	MA-L
48:50:73	MA-L
3C:83:75	MA-L
2C:54:91	MA-L
2C:29:97	MA-L
28:18:78	MA-L
28:16:A8	MA-L
20:A9:9B	MA-L
20:62:74	MA-L
14:9A:10	MA-L
10:2F:6B	MA-L
0C:E7:25	MA-L
0C:41:3E	MA-L
00:25:AE	MA-L
00:22:48	MA-L
00:1D:D8	MA-L
00:17:FA	MA-L
00:15:5D	MA-L
00:12:5A	MA-L
00:03:FF	MA-L

Only one of them is known to be used by the Hyper-V Virtual Machines – 00:15:5d.

Detection Rule 1

Affects products: Hyper-V Virtual Machines

Signature: OUI is 00:15:5d

Conditions

For dynamic allocation, MAC addresses' range could be set in Hyper-V preferences.

The default MAC address is calculated on the first start:

The first three octets (aa-bb-cc) are Microsoft's IEEE organizationally Unique Identifier, 00:15:5D (which is common on all Hyper-V hosts).
The next two octets (dd-ee) are derived from the last two octets of the server's IP address.
The last octet (ff) is randomly generated from the range 0x0 – 0xFF.

Administrator can also set any static MAC address manually:

References

Managing MAC Address Pools in Hyper-V R2
Windows Hyper-V server has a default limit of 256 dynamic MAC addresses
How to Solve MAC Address Conflict on Hyper-V
Virtual machine MAC addresses

Example MACs generated

00:15:5d:01:8d:00
00:15:5d:01:8d:01
00:15:5d:01:8d:02

Tested on

Windows Server 2012 R2

Virtual Machine’s MAC ranges

How to recognise a VMware's virtual machine by its MAC address?
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How to recognise an Oracle Virtual machine by its MAC address?

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What is the maximum number of ports supported by the Hyper

Virtual switches enable the Hyper-V server to participate on the networks to which the physical adapters are connected. d. Virtual switches have unlimited ports, freeing network administrators from connecting physical switches by uplinks or crossover circuits. 3.