Bonjour duplicates on macOS — remove stale entries & reset cache

Joe B.

Reviewed for technical accuracy

Specialities: macOS (Sonoma/Ventura/Monterey), AirPrint/Bonjour (DNS‑SD), Printers, Networking, CUPS

AirPrint duplicates, multiple printers in Printers & Scanners, stale Bonjour entries — macOS Sonoma/Ventura

Technician

Hey! Let’s clean up your Bonjour duplicates on macOS. Do you see the same printer listed twice or three times in System Settings → Printers & Scanners (e.g., AirPrint, IPPS Secure, or IPP Everywhere)? Also tell me if the device is on Wi‑Fi or Ethernet, and whether it’s showing as Idle, In Use, or Offline.

Customer

Yep — my Brother laser shows up three times: “Brother‑XXXX AirPrint”, “Brother‑XXXX IPP Secure”, and another “Bonjour” entry. Sometimes one goes offline. Printing works but users pick the wrong queue.

Technician

Understood. Bonjour / DNS‑SD advertises multiple print services: _ipp._tcp (IPP Everywhere/AirPrint), _ipps._tcp (Secure AirPrint), and sometimes _printer._tcp or LPR. macOS discovers each service separately, which creates AirPrint duplicates or multiple printers in Printers & Scanners.
Other causes include:
• Stale service records in the mDNSResponder cache after a network change.
• A printer advertising both Wi‑Fi and Ethernet with different hostnames.
• Old, manually added IP queues plus auto‑discovered Bonjour entries.
• Mixed DNS‑SD domains from VLANs/guest SSIDs or a repeater creating ghost entries.
We’ll remove stale queues, pick one protocol (usually AirPrint/IPPS), and reset the mDNSResponder cache.

Customer

What’s the fastest way to remove the duplicates safely?

Technician

Quick cleanup — remove duplicate AirPrint/Bonjour printers in macOS:
1) Go to System Settings → Printers & Scanners. Click the printer that actually works (prefer Secure AirPrint (IPPS) if available) → set as Default.
2) Delete extras: select the duplicate Bonjour entries and press Delete. Remove any old IP/LPR queues you don’t use.
3) Flush discovery: open Terminal and run: sudo killall -HUP mDNSResponder (this resets the mDNS cache). Then run: dns-sd -B _ipp._tcp local. to verify the single service you kept is being advertised.
4) Print a test page from the kept queue, then hide the Printers list in apps to avoid accidental selection.

Customer

Should I use AirPrint, IPP Everywhere, or the vendor driver on macOS?

Technician

Pick one protocol to avoid duplicates:
• Secure AirPrint (IPPS) is the best default for modern macOS (Sonoma/Ventura) — encrypted, driverless, reliable.
• AirPrint (IPP) is fine on trusted LANs if IPPS isn’t available.
• Vendor driver/CUPS PPD only if you need special finishing (staple/booklet) that AirPrint can’t expose.
After choosing, remove the other queues so macOS and apps stop showing multiple printers.

Customer

We reset the list but duplicates come back after reboot. Is there a cache I can clear?

Technician

Reset discovery & print caches:
• Flush Bonjour/DNS cache: sudo killall -HUP mDNSResponder.
• Reset printing system (deep clean): System Settings → Printers & Scanners → right‑click the devices list → Reset printing system… (removes all printers and jobs). Then re‑add only the Secure AirPrint queue.
• Clear CUPS jobs/options: visit http://localhost:631 → Administration → Delete Printer/Set Default Options for the kept queue.
• If the printer advertises both Wi‑Fi and Ethernet, disable one or give them the same hostname to prevent duplicate DNS‑SD records.

Customer

How do I stop users from adding the wrong Bonjour entry again?

Technician

Prevent future duplicates:
• On the printer’s web UI, disable legacy protocols (LPR/RAW 9100) and keep only IPP/IPPS.
• Rename the printer to a friendly, unique Bonjour name (e.g., Office‑Laser‑2F) so users recognize the right queue.
• If you manage Macs, deploy the queue via MDM (Profile Manager/Jamf) with Only use managed printers so users can’t add ad‑hoc Bonjour devices.
• On guest VLANs, block mDNS or use a Bonjour gateway so only the sanctioned service is discoverable.

Customer

Can I diagnose which Bonjour records are stale vs active?

Technician

Inspect DNS‑SD services with Terminal:
• Browse IPP: dns-sd -B _ipp._tcp local. (AirPrint).
• Browse secure IPP: dns-sd -B _ipps._tcp local. (Secure AirPrint).
• Resolve a specific service to host/IP: dns-sd -L "Office‑Laser‑2F" _ipps._tcp local.
Stale entries usually fail to resolve or point to an old IP/hostname. After the mDNSResponder flush, only live services should remain.

Customer

Any brand‑specific notes for HP, Brother, Epson, Canon with AirPrint?

Technician

Brand tips — AirPrint & Bonjour:
• HP: In the web admin, enable IPP/IPPS and AirPrint; disable WS‑Discovery/RAW 9100 to reduce duplicates. Keep firmware current so DNS‑SD TXT records are sane.
• Brother: Use Secure AirPrint where supported. Disable legacy NetBIOS/LPR broadcasts. Ensure the same hostname on Wi‑Fi/Ethernet.
• Epson: Prefer IPP Everywhere. If both Bonjour and Wi‑Fi Direct broadcast, turn Wi‑Fi Direct off to avoid extra entries.
• Canon: Enable AirPrint and IPP/IPPS. For enterprise models, advertise only one protocol via the device’s mDNS settings.

Customer

We also see duplicates on iPhones. Will this fix iOS AirPrint too?

Technician

Yes. iOS uses the same Bonjour/DNS‑SD discovery. Once the printer advertises only one service (ideally IPPS) and you’ve flushed mDNSResponder on Macs, iPhones and iPads will also stop showing AirPrint duplicates. If you use a controller (UniFi, Aruba, Cisco), enable a Bonjour gateway so only the intended VLAN services traverse.

Customer

Great — the list is clean now and only one AirPrint queue shows. Thanks!

Technician

Summary: If you see Bonjour duplicates or multiple AirPrint printers in macOS, pick one protocol (Secure AirPrint / IPPS), remove extra queues, reset the mDNSResponder cache, and optionally reset the printing system. Standardize the printer’s hostname and disable legacy protocols to prevent new DNS‑SD duplicates. Need help? Open the chat.

Quick answer: the accepted fix

Accepted fix when you have Bonjour duplicates on macOS or AirPrint duplicate printers: keep a single Secure AirPrint (IPPS) queue, delete stale Bonjour entries, then run sudo killall -HUP mDNSResponder to reset the mDNS cache. If duplicates persist, reset the printing system and re‑add only the standardized queue.

FAQ

Step‑by‑step (macOS cleanup)

1. Decide on one protocol: prefer Secure AirPrint (IPPS).
2. In System Settings → Printers & Scanners, delete duplicate Bonjour entries and set the remaining queue as Default.
3. Open Terminal → run sudo killall -HUP mDNSResponder to reset the cache.
4. (Optional) Reset printing system… to wipe stale queues; re‑add only the selected IPPS queue.
5. Verify with dns-sd -B _ipps._tcp local. and print a test page.

Advanced tips (networks & VLANs)

1. If the printer uses both Wi‑Fi and Ethernet, disable one or match hostnames to avoid duplicate DNS‑SD records.
2. On managed networks, enable a Bonjour gateway so clients only see the intended VLAN service.
3. Disable legacy LPR/RAW 9100 and advertise only IPP/IPPS on the device.

Sources

• Apple — Reset the printing system (macOS)
• Apple — Add or remove a printer on Mac
• Apple — How to reset DNS cache in macOS
• Apple Developer — Bonjour Overview (DNS‑SD/mDNS)

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