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Buy the ARRIS SURFboard SB8200. It is DOCSIS 3.1, it sits on the approved list for Xfinity, Spectrum and Cox, it has two Gigabit Ethernet ports and a two-year warranty, and it is the lowest-risk modem to put on a cable line. The budget pick is the Hitron CODA — DOCSIS 3.1 rated to 1 Gbps and certified for the same three providers — which is the cheapest modem here worth owning and therefore the one with the fastest payback. The Netgear CM1000 is the third option and the reason to price-check before you commit: it has the same broad approval and no meaningful technical difference.
The price cap, checkedAs of November 13, 2026, 3 of the 3 modems below with a readable listing price were under $200: ARRIS SURFboard SB8200 at $146.00, Netgear CM1000 at $199.00, Hitron CODA at $149.99. Amazon prices move daily and a cap is a bracket, not a guarantee — the Quick picks table re-reads every number from the listing, so trust the button over the headline on any given day.
Why this is the easiest money on your bill
Cable providers charge a monthly equipment rental for a modem or gateway, and it does not stop. Allconnect's fee guide and ConnectCalifornia's Xfinity breakdown both put typical modem and gateway rental in the range where a sub-$200 modem is paid off in roughly a year, after which it is pure saving — and you keep the hardware. Replacing your ISP router works through the arithmetic for both halves of the box.
The thing to be clear about: a modem is not a router. These three are modems only, so you also need a router or mesh system behind them. That is usually an advantage — you choose your own Wi-Fi rather than accepting the ISP's — but if you want one device, modem and router combos is the page for that decision.
What we ranked on
ISP approval breadth. The decisive criterion. A modem that is not on your provider's approved list may not be provisioned at all, and Xfinity checks against its own My Device Info list.
Speed headroom. The plan tier the modem is rated for, and whether it will still fit the plan you upgrade to in two years.
Ports. How many Ethernet ports, and how fast. All three here are Gigabit; the step up to a 2.5 Gbps port costs more than the cap allows.
Payback. Months of rental fees the purchase replaces, which is the real reason anyone shops this category.
The three modems under the cap
Modem
Standard
Approved by
Ethernet
ARRIS SURFboard SB8200
DOCSIS 3.1
Xfinity, Spectrum, Cox
2 x Gigabit
Netgear CM1000
DOCSIS 3.1
All three major cable lists
Gigabit
Hitron CODA
DOCSIS 3.1, up to 1 Gbps
Xfinity, Spectrum, Cox
Gigabit
Manufacturer specifications and published ISP approved-list coverage; see Sources.
Scroll the table sideways to see every column.
One model worth knowing about just above the cap: the ARRIS SURFboard S33 is the SB8200's practical successor and adds a 2.5 Gbps port, which is what you need if your plan is — or will become — faster than a gigabit. It sits above $200, so it is not a pick here, but if you are on a 1.2 Gbps or 2 Gbps tier it is the modem to buy rather than anything on this page.
Try this first
Check your provider's own approved list before you order
Xfinity checks customer-owned equipment against its My Device Info list and states that the device must support Gigabit speeds for a Gigabit plan, and that keeping it updated and troubleshooting it become your responsibility. Spectrum has been retiring DOCSIS 3.0 equipment. Five minutes on your own provider's page before you order avoids the one failure mode in this category that cannot be fixed by configuration.
What to buy
Any cable provider, gigabit or slower: SURFboard SB8200.
Cheapest payback: Hitron CODA.
Whichever is cheaper on the day: CM1000 against the SB8200.
Plan faster than a gigabit: spend past the cap on the SURFboard S33 — see modems for Xfinity.
How we picked
We do not run a test lab. Rankings here are built from the manufacturers' published specifications, measurements taken by independent outlets that do have labs, and the structural reasoning on this site about what a given house or job actually needs. Every product was checked as currently sold before it was included. Where a figure appears it is attributed and linked in Sources; where we have no basis for a claim, it is left out. Our methodology sets out exactly what we will and will not assert.
Quick picks
Ranked by our published scoring rubric (isp approval breadth, speed headroom, ports, payback). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
ARRIS SURFboard SB8200DOCSIS 3.1, on the approved list for Xfinity, Spectrum and Cox, two Gigabit Ethernet ports and a two-year warranty. The one to buy if you want the lowest chance of a provisioning argument.
Netgear CM1000DOCSIS 3.1 and the other modem that appears on all three big cable approved lists. There is no technical reason to prefer it or avoid it — check it on price the day you buy.
Hitron CODADOCSIS 3.1 rated to 1 Gbps and certified for Xfinity, Spectrum and Cox. The budget pick, and the fastest payback on this page for anyone on a gigabit-or-slower plan.
Prices as of November 13, 2026, read from each product's own Amazon listing; Amazon prices change often. Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
#1 · The safest modem to buy blind
ARRIS SURFboard SB8200
ARRIS · Midrange
The safe DOCSIS 3.1 modem: on the approved list for Xfinity, Spectrum and Cox, with a two-year warranty behind it.
Key specifications
Standard
DOCSIS 3.1
Ports
2 Gigabit Ethernet
Approved by
Xfinity, Spectrum and Cox
Warranty
2 years
Score 9.0/10
ISP approval breadth10.0
Speed headroom8.0
Ports8.5
Payback9.0
What it gets right
+Being on all three major approved lists means it survives a change of provider
+DOCSIS 3.1 is the floor now that cable operators are retiring 3.0 hardware
+A two-year warranty is unusual in this category
What to watch for
−Gigabit Ethernet only — a multi-gig plan needs a 2.5 Gbps port instead
−It is a modem, not a router: you still need Wi-Fi from somewhere
#ad Price as of November 13, 2026; Amazon prices change often. How we are funded.
Common questions
What is the best cable modem under $200?+−
The ARRIS SURFboard SB8200: DOCSIS 3.1, on the approved lists for Xfinity, Spectrum and Cox, two Gigabit Ethernet ports and a two-year warranty. The Hitron CODA is the budget pick with the same three certifications, and the Netgear CM1000 is worth a price check against the ARRIS because it has the same broad approval.
How long until buying a modem pays for itself?+−
Roughly a year at the rental rates US cable providers publish, for a modem under $200. After that the saving is ongoing and you still own the hardware. The arithmetic is simple: divide the purchase price by the equipment rental line on your bill. Anything under about fourteen months is an easy decision.
Do I need a router as well as a modem?+−
Yes. Every modem on this page is a modem only — it converts the cable signal and gives you one or two Ethernet ports, with no Wi-Fi and no routing. You need a router or a mesh system behind it. That is generally what you want, because it lets you choose your own Wi-Fi hardware, but if you would rather have a single box, look at modem-router combos instead.
Will my ISP let me use my own modem?+−
Every major US cable provider allows customer-owned modems, but only from its own approved list. Xfinity checks against My Device Info and requires a device that supports Gigabit speeds for a Gigabit plan, and makes updates and troubleshooting your responsibility. Check the list for your provider and your plan tier before ordering — all three picks here appear on the Xfinity, Spectrum and Cox lists.
