Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Networking & IT Infrastructure
MAC Address Vendor Lookup — OUI Manufacturer Identifier
OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
Map OUI prefix octets to common network hardware vendors for inventory and troubleshooting. Planning estimates only — verify with production tools and vendor pricing where applicable.
Inputs
0255
0255
0255
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Likely vendor = Cisco Systems. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
Scenario studio
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Scenario A
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
OUI octet 1 (hex as decimal 0–255)
The “OUI octet 1 (hex as decimal 0–255)” value used in this tool’s formula. Adjust it to see results update live.
OUI octet 2
The “OUI octet 2” value used in this tool’s formula. Adjust it to see results update live.
OUI octet 3
The “OUI octet 3” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Map OUI prefix octets to common network hardware vendors for inventory and troubleshooting. Planning estimates only — verify with production tools and vendor pricing where applicable. OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks. Example: 00:1A:2B → common enterprise switch/router vendor range.
OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
Example: 00:1A:2B → common enterprise switch/router vendor range.
When to use this MAC Address Vendor Lookup
Common use cases
- Map OUI prefix octets to common network hardware vendors for inventory and troubleshooting.
- Sanity-check with this case: 00:1A:2B → common enterprise switch/router vendor range.
- The relationship is: OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
Localized examples
- Networking & IT Infrastructure: the example on this page uses the same formula as the widget.
What you get
- Fields: OUI octet 1 (hex as decimal 0–255), OUI octet 2, OUI octet 3
- OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
- Example on the page: 00:1A:2B → common enterprise switch/router vendor range.
How to Calculate MAC Address Vendor Lookup Step-by-Step
- 1Enter OUI octet 1 (hex as decimal 0–255), OUI octet 2, OUI octet 3. Use the values you have, not a catalog average, unless that is all you know.
- 2OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
- 3Worked case: 00:1A:2B → common enterprise switch/router vendor range.
- 4Compare the result to last month’s invoice or a vendor calculator before you commit capacity.
Governing formula
OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
00:1A:2B → common enterprise switch/router vendor range.
Example: set OUI octet 1 (hex as decimal 0–255) = 0, OUI octet 2 = 26, OUI octet 3 = 43, then read the result.
Variable definitions
- oui1
OUI octet 1 (hex as decimal 0–255)
The “OUI octet 1 (hex as decimal 0–255)” field. Default 0; typical range 0–255.
- oui2
OUI octet 2
The “OUI octet 2” field. Default 26; typical range 0–255.
- oui3
OUI octet 3
The “OUI octet 3” field. Default 43; typical range 0–255.
- Closed-form math (OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.) misses idle time, egress, packet loss, and reserved capacity on the real bill.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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