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
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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Scenario B
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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.
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.
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. Scenario: 00:1A:2B → common enterprise switch/router vendor range.
OUI = first 24 bits (3 octets); matched against IEEE-assigned manufacturer blocks.
Scenario: 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 scenario: 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.
- Scenario on the page: 00:1A:2B → common enterprise switch/router vendor range.
How to Calculate MAC Address Vendor Lookup
- 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.
- 3Scenario: 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.
00:1A:2B → common enterprise switch/router vendor range.
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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