Cox is being absorbed into Spectrum. Your hardware keeps working, but the fees, caps and contracts are changing — and that changes what is worth buying.
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Worth knowing
Cox is now Spectrum
Charter, Spectrum's parent company, has completed its acquisition of Cox. From 16 September 2026, Cox internet is sold under Spectrum packaging — Spectrum Internet 100, 500 and 1 Gig, with 2 Gig in select markets. Existing Cox equipment keeps working through the transition and customers are told they do not need to do anything immediately; migration notices arrive by mail and email. Reported as of 20 September 2026.
The short version: buy a modem that is approved by both Cox and Spectrum, and you are covered either way. The ARRIS SURFboard SB8200 and Netgear CM1000 appear on all three major approved lists, and the ARRIS S33 and Netgear CM3000 are approved broadly as well — so none of them becomes a problem when your account changes hands.
What the merger changes for you
Cox (before)
Spectrum (after)
Data cap
1.25 TB per month, with $10 per 50 GB overage
Unlimited, no cap
Modem
About $15 a month for the Panoramic Wi-Fi gateway
Modem included; a Wi-Fi router charge applies
Contract
1-year and 2-year terms with early termination fees
Month to month
Physical network
Unchanged — the cables in the street are the same
Unchanged
Reported differences between the old Cox terms and Spectrum's. Confirm against your own migration notice.
Scroll the table sideways to see every column.
Two of those matter for a hardware decision. The data cap going away is straightforwardly good. And the equipment arrangement flipping from a ~$15 gateway rental to an included modem plus a Wi-Fi charge means the best buy shifts from "a modem, urgently" to "a router, and keep their modem" — which is exactly the Spectrum situation described on our Spectrum page.
Will your own equipment work?
Yes, and it is worth doing now rather than waiting. Cox permits customer-owned modems and routers, and so does Spectrum. Buy DOCSIS 3.1 or better — cable operators are retiring DOCSIS 3.0 from their approved lists, and Spectrum ends DOCSIS 3.0 support entirely on 28 October 2026, which will apply to migrated Cox accounts too.
What renting actually costs you
Worth knowing
On the fee figures below
Equipment fees vary by provider, plan, promotion and market, and published sources disagree — which is itself the useful fact. We give the range from named sources, dated, and then tell you to read your own bill, because the line on your bill is the only number that applies to you. We do not invent a single figure and present it as universal.
On the old Cox terms, roughly $15 a month for the Panoramic gateway means a $130 modem pays for itself in about nine months. After migration, with the modem included and a Wi-Fi router charge reported around $5 to $7, the equation moves to the router: at $5 a month a $130 router breaks even around month 26, and at $7 around month 19.
Either way the non-financial arguments are unchanged and they are the stronger ones — better radios than a rented gateway, and the freedom to put the Wi-Fi somewhere other than where the coax enters. See placement.
Picks by plan speed
Plan tier
Modem
Router
100 to 500 Mbps
Hitron CODA or keep the supplied modem
Any decent Wi-Fi 6 router
1 Gig
ARRIS SB8200 or S33
Tri-band with a Gigabit or faster WAN
2 Gig (select markets)
ARRIS S33 or Netgear CM2000
2.5 Gbps WAN port
Scroll the table sideways to see every column.
If coverage is the problem, not the box
As everywhere: if the speeds are fine beside the gateway and bad at the far end of the house, hardware at the gateway is not the fix. Start at dead zones, then your house shape.
How we picked
Compatibility and approved-list facts come from the sources named below, checked on 26 September 2026. We do not run a lab, so hardware performance context comes from outlets that do. Verify the exact model number against your provider's own current approved-equipment list before ordering — those lists change, and they differ by speed tier. What we do and do not assert.
Quick picks
Ranked by our published scoring rubric (approval breadth, speed headroom, longevity, value). 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
Illustrative
ARRIS SURFboard S33DOCSIS 3.1 with a 2.5 Gbps port, approved across Xfinity, Spectrum and Cox, so it survives a change of provider or plan.
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
Illustrative
#1 · The modem to buy on a fast cable plan
ARRIS SURFboard S33
ARRIS · Midrange
The SB8200's replacement in practice: same broad approval, plus a 2.5 Gbps port so it can keep up with a faster plan later.
Key specifications
Standard
DOCSIS 3.1
Ports
2.5 Gbps plus Gigabit Ethernet
Approved by
Xfinity, Spectrum, Cox and most cable ISPs
Score 9.3/10
Approval breadth10.0
Speed headroom9.0
Longevity9.5
Value8.5
What it gets right
+The 2.5 Gbps port means the modem will not be the thing capping you after a plan upgrade
+Approved almost everywhere, so it moves house with you
What to watch for
−Costs more than the SB8200 for headroom you may not use yet
#ad We do not publish a price we cannot verify, so the button opens Amazon's own listing. How we are funded.
Common questions
Is Cox becoming Spectrum?+−
Yes. Charter, Spectrum's parent company, completed its acquisition of Cox, and from 16 September 2026 Cox internet is sold under Spectrum packaging. Existing equipment keeps working through the transition and customers receive migration notices by mail and email.
Will my Cox modem still work after the Spectrum migration?+−
Existing Cox equipment is reported to keep working through the transition. To be safe, own a modem that appears on both the Cox and Spectrum approved lists — the ARRIS SB8200 and Netgear CM1000 appear on all three major lists. Make sure it is DOCSIS 3.1 or better.
Does the Cox data cap go away under Spectrum?+−
That is the reported change. Cox enforced a 1.25 TB monthly cap with $10 overages per 50 GB, while Spectrum offers unlimited data with no cap. Confirm against your own migration notice.
Illustrative
