Our take
The HP LaserJet 4100mfp is a legacy monochrome enterprise multifunction printer with an exact U.S. part mapping: HP lists C9148A#ABA for this model. HP's support materials cover copy, scan and fax alongside printing, with a 30-sheet ADF, 600 dpi optical scan and standard Fast Ethernet and parallel connections. That can serve an office that handles paper originals and fax as well as a shared network print queue. The reviewed material does not establish automatic duplex or a recommended monthly workload, and wireless uses optional server hardware. HP marks the product discontinued, so the model's original capabilities must be separated from the condition and compatibility of any offered unit.
A buyer evaluating an enterprise-class legacy mono MFP who can verify the exact unit, drivers and support for its paper workflow..
Choose another device if you require built-in Wi-Fi, confirmed automatic duplex, a published workload recommendation, a compact footprint or ongoing HP support.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- HP maps the U.S. product number C9148A#ABA to the exact 4100mfp model.
- The HP MFP documentation covers copy, scan and fax with a 30-sheet ADF and optical scanning.
- Standard Fast Ethernet can support a shared wired queue without assuming an optional print server.
What to weigh up
- The model is discontinued, and HP's listing does not establish the condition or remaining life of a specific unit.
- Automatic duplex and a comparable recommended monthly range are not confirmed in the reviewed source set.
- Wireless networking requires optional print-server hardware rather than being a built-in standard capability.
The key details
| Model covered | 4100mfp (C9148A#ABA) |
|---|---|
| Main functions | Monochrome print, copy, scan and fax |
| Print output | 30-sheet ADF; 600 dpi optical scan |
| Two-sided printing | Fast Ethernet and parallel standard; wireless optional; duplex and monthly recommendation unknown |
Performance figures are manufacturer claims. Source checked October 8, 2026. Regional models and included accessories can differ.
What the features mean for you
A shared mono station for paper workflows
HP identifies the 4100mfp as a multifunction printer and publishes a separate user guide and analog fax guide for the series. The included workflow therefore extends beyond printing to copying, scanning and fax tasks. Its monochrome engine is suited to document output rather than color pages. A 30-sheet ADF supports a short stack of originals, while the flatbed offers a path for single sheets that should not go through rollers. The source establishes those device functions, but buyers should check the software and connection requirements against today's computers before relying on a 20-year-old scanner workflow.
Feeder and scan detail matter more than a speed claim
HP's exact support page lists 600 dpi optical scanning and a 30-sheet ADF. Those facts help assess whether a department can capture ordinary forms without placing each page manually. The source reviewed here does not provide an exact print-speed figure, and the catalog leaves it out. Similarly, the presence of an ADF alone does not mean both sides scan automatically. If two-sided originals are common, confirm the exact manual and feeder configuration before deciding whether this model reduces or merely shifts handling work.
Ethernet is standard; wireless is an add-on
HP lists Fast Ethernet 10/100 and parallel as standard connectivity, with optional HP Jetdirect servers and wireless print servers. This can fit an office that wants a fixed wired queue. The exact unit must be checked for the right port and any added hardware, especially if an old internal card has been removed. The 4100mfp is not a standard built-in Wi-Fi printer. If the deployment only has wireless devices, a newer model may reduce setup work and improve compatibility with current network security policies.
Do not infer duplex or a monthly target
The sources reviewed establish the 4100mfp's basic workflow, ADF, scan resolution and interfaces, but they do not establish an automatic duplex unit or a manufacturer-recommended monthly volume. Both fields remain unknown in the matching profile. The model's large-paper handling or enterprise positioning should not be used as a substitute for a recommended range. A buyer who needs two-sided output should inspect the exact machine and consult HP documentation for its fitted configuration. A buyer with high page counts should look for explicit workload guidance and service history instead of relying on a maximum duty-cycle figure.
Discontinued hardware needs a realistic support check
HP identifies the LaserJet 4100mfp as discontinued and says it is not available from its shop. A listing may be used or renewed, but HP's page does not describe the state of that example. Before choosing it, verify the part number, hard disk and tray configuration, fax port, ADF feed, scanner glass, Ethernet card and power cord. Check whether the intended computer can still install a supported driver and whether supplies and repair parts are obtainable. These are practical selection checks, not a claim that every unit is faulty. If predictable support matters, compare with a current mono fax MFP.
What else to compare
Compare a current monochrome fax MFP if Wi-Fi, documented duplex or continuing driver and service support are required.
Before you buy
Does the 4100mfp support fax?
HP provides a dedicated analog fax guide for the LaserJet 4100 MFP series and identifies the exact model as an MFP.
Does it have standard Ethernet?
HP lists Fast Ethernet 10/100 as standard connectivity; wireless print servers are optional accessories.
Does HP specify automatic duplex or a recommended monthly range?
Those details are not established in the sources reviewed for this exact model, so both remain unknown here.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- HP U.S. LaserJet 4100mfp exact-part product page ↗ — checked October 8, 2026.
- HP U.S. exact part C9148A#ABA and discontinued status ↗ — checked October 8, 2026.
- HP 4100 MFP series specifications for monochrome technology and standard Ethernet ↗ — checked October 8, 2026.
- HP MFP and analog fax guide list for exact 4100 series workflows ↗ — checked October 8, 2026.
The decision
The 4100mfp is relevant to a wired legacy office that will use its copy, scan and fax workflow. Its discontinued status and unconfirmed duplex and workload guidance make exact-unit checks essential.
Is it the right fit?
Check the exact model and today’s offers on Amazon.