Our take
The Lexmark MS421dn is a single-function monochrome laser printer for a small wired workgroup. Lexmark identifies the exact model as part 36S0200 and documents integrated duplex, Gigabit Ethernet, USB 2.0, up to 42 pages per minute and a recommended monthly range of 1,000 to 10,000 pages. Its standard paper setup is a 250-sheet input tray plus a 100-sheet multipurpose feeder, with 150-sheet output. Lexmark marks this model discontinued. It is easier to evaluate for paper and workload than a product with missing specs, but it is not a wireless printer or an all-in-one.
A fixed small-workgroup printer where Ethernet is available and a 1,000–10,000-page recommendation matches expected volume..
Skip it if you need Wi-Fi, color, copying, scanning or fax. A personal printer with only occasional output may not benefit from its workgroup-oriented recommended range.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Lexmark documents integrated duplex for the exact MS421dn.
- Gigabit Ethernet and USB are standard ports, with no optional network adapter needed for wired sharing.
- The 1,000–10,000 page recommendation helps assess a small office queue.
What to weigh up
- The listed standard ports do not include wireless networking.
- It is print-only, with no scanner, copier or fax.
- Lexmark marks the model discontinued, so check drivers, parts and consumables for the specific offer.
The key details
| Model covered | MS421dn (part 36S0200) |
|---|---|
| Main functions | Print only |
| Print output | Monochrome laser; up to 42 ppm |
| Two-sided printing | Integrated automatic duplex |
Performance figures are manufacturer claims. Source checked October 8, 2026. Regional models and included accessories can differ.
What the features mean for you
A wired rather than wireless office fit
The MS421dn's standard ports are Gigabit Ethernet and USB 2.0. The suffix n corresponds to the network configuration, while wireless is not listed as a built-in interface on this exact model. An office with an Ethernet drop can use it as a shared printer; a buyer who expects direct Wi-Fi should choose a model with confirmed wireless rather than assume a separate accessory will be present. The printer's network features do not establish compatibility with a particular modern security policy, so check setup requirements before deployment.
Integrated duplex supports recurring two-sided jobs
Lexmark lists integrated duplex printing. That means the model can turn pages automatically for supported two-sided documents, a useful feature for a workgroup that sends reports or internal forms throughout the week. Duplex speed is lower than simplex speed in Lexmark's rating, so the headline 42 pages per minute applies to one-sided work rather than every job. These are manufacturer specifications, not measured throughput for a given queue. If every second page matters, the built-in unit avoids the manual paper handling required by single-sided models.
Match the recommended range to the team's queue
Lexmark recommends 1,000 to 10,000 pages per month and lists a separate maximum duty cycle of up to 100,000 pages. The recommendation should guide routine selection; the maximum is not an ordinary monthly goal. A small team near the lower end has a different fit from a shared office close to the upper end, and complex jobs can behave differently from simple text pages. Count the regular pages from all users and consider expected growth. The specification supports a workload comparison but does not promise performance or condition for an individual unit.
Standard paper supply is defined and expandable
Lexmark documents a 250-sheet input tray and a 100-sheet multipurpose feeder, with 150-sheet output. That is 350 sheets of standard input before any optional tray is added. The multipurpose feeder supports envelopes and specialty media, while the main tray takes standard sizes including Letter and Legal. Optional trays can expand input capacity, but a seller may offer the base model without them. Confirm installed accessories and feeder movement on the actual device instead of treating the maximum configured capacity as standard.
Print-only keeps the task list focused
Lexmark classifies the MS421dn as monochrome laser printing, without copier, scanner or fax functionality. That simplicity fits a dedicated document queue but cannot support walk-up digitizing or sending a fax. It may be useful as one component of a broader office setup where an MFP already handles originals. The finder separates these functions so a requirement for copying or scanning excludes this model rather than treating Ethernet or the word workgroup as evidence of multifunction capability.
Discontinued status calls for a supply and driver check
Lexmark marks the MS421dn discontinued. The page identifies included toner and an imaging unit for the original package, but the listing does not establish what remains inside a present resale unit. Check the 36S0200 part label, confirm that the Ethernet port and duplex path work, and review driver support for the computers that will print to it. Ask what toner is included and what return terms apply. The review does not claim current prices, parts availability or hands-on inspection of a particular printer.
What else to compare
The Dell 5530dn is a higher-volume monochrome duplex option with a 5,000–35,000-page recommendation; the MS421dn is the smaller small-workgroup choice.
Before you buy
Does the MS421dn include automatic duplex?
Yes. Lexmark lists integrated duplex printing as a feature of the MS421dn.
Does it support Wi-Fi?
Lexmark lists Gigabit Ethernet and USB as standard ports; built-in wireless is not documented for this exact model.
What monthly volume is recommended?
Lexmark recommends 1,000 to 10,000 pages per month. Its maximum duty cycle is a different figure.
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.
- Lexmark U.S. MS421dn product page and specifications ↗ — checked October 8, 2026.
- Lexmark MS421dn part, duplex, speed, monthly range, paper capacity, ports and lifecycle ↗ — checked October 8, 2026.
The decision
Choose the MS421dn for wired monochrome duplex printing when its recommended range matches the office. Its discontinued status and lack of built-in Wi-Fi narrow the fit.
Is it the right fit?
Check the exact model and today’s offers on Amazon.