# Cat 5e vs. Cat 6 vs. Cat 6A: Which Ethernet Cable Do You Need?

> Cat 5e handles 2.5 Gbps, Cat 6 handles 5 Gbps and Cat 6A handles 10 Gbps at full length. Here is which Ethernet cable to buy for a home network.

- URL: https://wifiweekly.com/guides/ethernet-cable-cat5e-vs-cat6-vs-cat6a/
- Type: Guide
- Topic: How-To & Fixes
- Author: Tehseen Arbab
- Published: 2026-10-06
- Last updated: 2026-10-06
- Publisher: WiFi Weekly (https://wifiweekly.com/)

## Short answer

For most homes, Cat 6 is the cable to buy: it supports 5 Gbps over 100 meters and 10 Gbps over shorter runs. Cat 5e you already own is fine up to 2.5 Gbps. Choose Cat 6A for in-wall runs if you want 10 Gbps at any length. Skip Cat 8, which is a short-range data center cable, and avoid copper-clad aluminum (CCA) cable whatever category is printed on it.

## Key takeaways

- Cat 5e supports 2.5 Gbps over 100 meters (328 feet), and Cat 6 supports 5 Gbps over the same distance, according to Fluke Networks' summary of the IEEE 802.3bz standard.
- 10 Gbps over Cat 6 is expected to work up to 37 meters (about 121 feet) and may work up to 55 meters (about 180 feet). Cat 6A supports 10 Gbps up to 100 meters.
- Cat 8 is designed for 25 and 40 Gbps over a maximum of 30 meters and is always shielded. It offers a home network nothing that Cat 6A doesn't.
- Cable with copper-clad aluminum (CCA) conductors does not meet the category standards, which require solid copper. Fluke Networks says to check by weight or by scraping a conductor.

---


For most homes, buy Cat 6. It supports 5 Gbps over the full 100 meters (328 feet) and 10 Gbps over shorter runs, which covers every port on current home routers and mesh systems. If you already have Cat 5e, keep it: it is good for up to 2.5 Gbps. Choose Cat 6A when you are putting cable inside walls and want 10 Gbps at any length. Cat 8 is built for data centers and is not worth buying for a house.

"Cat" is short for category, a performance grade defined in cabling standards. A higher category is built and tested to carry signals at higher frequencies, which allows higher speeds or longer runs at a given speed. This guide draws on the IEEE Ethernet standards and on Fluke Networks, which makes the test equipment installers use to certify cabling. We have not tested cables ourselves.

## How do the Ethernet cable categories compare?

| Category | 1 Gbps | 2.5 Gbps | 5 Gbps | 10 Gbps | 25 and 40 Gbps |
|---|---|---|---|---|---|
| Cat 5e | Yes | Yes, to 100 m | In some cases | Not rated | No |
| Cat 6 | Yes | Yes, to 100 m | Yes, to 100 m | To 37 m; 37 to 55 m depending on interference | No |
| Cat 6A | Yes | Yes, to 100 m | Yes, to 100 m | Yes, to 100 m | No |
| Cat 8 | Yes | Yes | Yes | Yes | Yes, to 30 m |

100 meters is 328 feet. 55 meters is about 180 feet, 37 meters about 121 feet, and 30 meters about 98 feet. Lengths are for the whole link, including the patch cables at each end.

The 2.5 and 5 Gbps speeds come from an Ethernet standard, IEEE 802.3bz, published on October 18, 2016. It was written so that buildings already wired with Cat 5e and Cat 6 could go faster than 1 Gbps without new cable. That is why the 2.5 Gbps port on a current router works over older cable.

## Is Cat 5e still good enough?

For most connections, yes. Fluke Networks says Cat 5e and Cat 6 are "both of which are typically able to support up to 1000 Mbps," and that Cat 5e supports 2.5 Gbps over 100 meters. It adds that Cat 5e can carry 5 Gbps only in "defined use cases."

So Cat 5e is fine for:

- An internet plan of 1 Gbps or less.
- A router or mesh system with 1 Gbps or 2.5 Gbps ports.
- Wiring mesh units together. Eero, for example, lists Cat 5e, Cat 6 and Cat 6A as suitable cables.

One caution applies to cable bundles. Fluke notes that Cat 5e and Cat 6 were never specified for alien crosstalk, which is interference between neighboring cables, and that it is "a limiting factor" at 2.5 and 5 Gbps. Long runs tightly bundled with other cables are where trouble shows up. A single cable from a router to a nearby device is not that situation.

Don't rip out working Cat 5e. Replace it when a specific link needs to run faster than it can.

## When do I need Cat 6?

Cat 6 is the sensible default for new cables. It supports 5 Gbps over 100 meters. It also carries 10 Gbps over shorter distances: under the industry guidance Fluke cites, 10 Gbps "should operate over channel lengths of up to 37 meters of Category 6 cabling," and between 37 and 55 meters "depending on the alien crosstalk environment."

Most runs inside a house are well under 37 meters. That makes Cat 6 a reasonable choice even if you expect to use 10 Gbps equipment later, with one caveat. Fluke says results over Cat 6 at 10 Gbps are unpredictable, with some 60-meter links passing and some 30-meter links failing, because interference varies from one installation to the next.

## When is Cat 6A worth it?

When the cable is going somewhere hard to reach again. Cat 6A is the category designed for 10 Gbps, supporting it "up to 100 m (328 ft)."

Buy Cat 6A if:

- You are running cable inside walls, ceilings or between floors, and you want it to last through several generations of equipment.
- You have, or plan to buy, 10 Gbps equipment and a run is longer than about 37 meters.
- Many cables will run bundled together over a long distance.

Cat 6A cable is generally thicker and stiffer than Cat 6, which makes it harder to route around corners. For a short patch cable between a modem and a router, it brings no benefit over Cat 6.

## Should I buy Cat 7 or Cat 8?

**Cat 8: no.** Fluke's fact sheet says Cat 8 supports 25 and 40 Gbps Ethernet with a "maximum Channel length of 30m (100')" at those speeds, and that "there is no unshielded variant." Home routers, mesh systems, consoles and PCs do not have 25 or 40 Gbps copper ports, so a Cat 8 cable in a house runs at whatever lower speed the devices support. Cat 6A does the same job.

**Cat 7: also no.** Cat 7 is widely sold online, but it is not one of the categories in the US cabling standard. A summary of the current ANSI/TIA-568 standard by cable maker trueCABLE lists Cat 5e, Cat 6, Cat 6A and Cat 8 as the recognized copper categories. A cable labeled Cat 7 with ordinary RJ45 plugs will usually work as an Ethernet cable, but the label is not a rating you can check against that standard. Buy Cat 6 or Cat 6A instead.

## Which cable matches my equipment?

Match the cable to the fastest port on the link. The link runs at the speed of its slowest part.

| Your fastest port or plan | Cable to use | Notes |
|---|---|---|
| 1 Gbps ports, plan up to 1 Gbps | Cat 5e or Cat 6 | No reason to replace existing Cat 5e |
| 2.5 Gbps ports or a 2 Gbps plan | Cat 5e or Cat 6 | Both support 2.5 Gbps to 100 m |
| 5 Gbps ports or plan | Cat 6 | Cat 5e supports 5 Gbps only in some cases |
| 10 Gbps ports, runs under about 37 m | Cat 6 or Cat 6A | Cat 6A is the safer choice for bundled or in-wall runs |
| 10 Gbps ports, longer runs | Cat 6A | Rated for 10 Gbps to 100 m |
| New in-wall wiring, any speed | Cat 6A, or Cat 6 on a budget | The cable is the hard part to replace later |

Check the port speeds in your router's specifications, including the internet (WAN) port. A fast plan and a good cable still stop at 1 Gbps if the port does. If you are wiring a mesh system, see our guide to [wired and wireless backhaul](https://wifiweekly.com/guides/mesh-wifi-wired-vs-wireless-backhaul/), and for sizing the plan itself, [how much internet speed you need](https://wifiweekly.com/guides/how-much-internet-speed-do-i-need/).

## What should I avoid?

**Copper-clad aluminum (CCA).** Some low-priced cable uses aluminum conductors with a thin copper coating. Fluke Networks says cables with CCA conductors are "non-standards compliant," because the standards require solid copper, and that they "often do not have a valid UL safety listing." It also says aluminum's resistance is "about 55% greater than for a copper cable of the same diameter," which wastes power as heat when a cable carries Power over Ethernet (PoE), the feature that powers devices such as cameras and access points through the network cable.

Fluke suggests two checks anyone can do: weigh the box against a known copper cable, since aluminum is lighter, or scrape a conductor "to reveal the silver colored aluminum beneath the copper cladding." Look for "solid copper" or "pure copper" in the listing, and treat a missing answer as a no.

**Paying for a category you can't use.** A higher number does not make a connection faster than its ports. Cat 8 on a 1 Gbps port is a 1 Gbps link.

**Flat or very thin cables for long runs.** These are convenient under rugs and along baseboards, but we could not find them covered by the sources above, so we can't vouch for their performance at multi-gigabit speeds. For anything long or permanent, use standard round cable from a maker that states the category and conductor material.

## Does a better cable speed up my internet?

Only if the cable was the bottleneck. Replacing Cat 5e with Cat 6A on a 500 Mbps plan changes nothing, because Cat 5e already carries more than that.

A damaged or badly made cable is different. A link that should run at 1 Gbps but connects at 100 Mbps can point to a faulty cable or plug, and swapping it is a cheap test. If wired speed is fine and wireless is slow, the cable isn't the issue; see [why Wi-Fi can be slow when your internet is fast](https://wifiweekly.com/guides/wifi-slow-but-internet-fast/).

## Fact-check notes

| Important claim | Source | Verification |
|---|---|---|
| IEEE 802.3bz, published October 18, 2016, defines 2.5 Gbps and 5 Gbps Ethernet over twisted-pair cabling | [IEEE Standards Association, 802.3bz-2016](https://standards.ieee.org/ieee/802.3bz/6130/) | Verified |
| Cat 5e supports 2.5 Gbps over 100 m and 5 Gbps only in defined use cases; Cat 6 supports 5 Gbps over 100 m; both typically support 1,000 Mbps | [Fluke Networks, January 17, 2018](https://www.flukenetworks.com/blog/cabling-chronicles/will-my-existing-cable-plant-support-255gbase-t) | Qualified: a test-equipment maker's summary of the standards; alien crosstalk can limit long, bundled runs |
| 10 Gbps should operate over Cat 6 up to 37 m and from 37 to 55 m depending on alien crosstalk; Cat 6A supports it up to 100 m | [Fluke Networks, 10GBASE-T field testing requirements](https://www.flukenetworks.com/knowledge-base/applicationstandards-articles-copper/10gbase-t-field-testing-requirements) | Qualified: Fluke's quotation of industry guidance (TSB-155); real results over Cat 6 vary by installation |
| Cat 8 supports 25 and 40 Gbps over a maximum channel of 30 m, is always shielded, and uses the same 8-position connector as Cat 5e to Cat 6A | [Fluke Networks, Cat 8 fact sheet](https://www.flukenetworks.com/knowledge-base/applicationstandards-articles-copper/category-8-cabling-fact-sheet) | Verified from the fact sheet |
| The current ANSI/TIA-568 copper standard covers Cat 5e, Cat 6, Cat 6A and Cat 8, and not Cat 7 | [trueCABLE summary of ANSI/TIA-568](https://www.truecable.com/blogs/cable-academy/the-ansi-tia-568-series-of-specifications-what-is-most-important-to-know-for-copper) | Qualified: a cable maker's summary; we did not read the paid standard itself |
| The maximum Ethernet cable length is 328 feet (100 m) | [trueCABLE summary of ANSI/TIA-568](https://www.truecable.com/blogs/cable-academy/the-ansi-tia-568-series-of-specifications-what-is-most-important-to-know-for-copper) | Qualified: a cable maker's summary of the standard |
| CCA cable is not standards compliant, often lacks a valid UL listing, and has about 55% higher resistance than copper of the same diameter | [Fluke Networks, CCA cables](https://www.flukenetworks.com/blog/cabling-chronicles/cca-not-worth-savings-or-risk) | Verified as Fluke Networks' stated position |
| eero lists Cat 5e, Cat 6 and Cat 6A for wiring its units together | [eero Support](https://eero.com/support/articles/can-i-connect-my-eeros-with-ethernet) | Verified from manufacturer documentation as of October 5, 2026 |

## Bottom line

Keep the Cat 5e you have unless a link needs more than 2.5 Gbps. Buy Cat 6 for new patch cables and ordinary runs. Use Cat 6A for wiring that goes inside walls or needs 10 Gbps over a long distance. Leave Cat 7 and Cat 8 on the shelf, and make sure whatever you buy has solid copper conductors.


## Frequently asked questions

### Is Cat 5e good enough for gigabit internet?

Yes. Fluke Networks says Cat 5e and Cat 6 are both typically able to support up to 1,000 Mbps, and Cat 5e supports 2.5 Gbps over 100 meters. There is no need to replace working Cat 5e for a 1 Gbps plan.

### Do I need Cat 6A for a 2.5 Gbps port?

No. Cat 5e supports 2.5 Gbps over 100 meters, and Cat 6 supports 5 Gbps over 100 meters. Cat 6A matters when you want 10 Gbps on runs longer than about 37 meters.

### Is Cat 8 better for gaming?

No. Cat 8 supports 25 and 40 Gbps, which no home router, console or gaming PC port uses. Game traffic needs only a few Mbps. A Cat 6 cable carries it exactly as well.

### Can I mix cable categories in one network?

Yes. All of these categories use the same 8-position plug, commonly called RJ45. A link runs at the speed its slowest part supports, including the cable, the wall jacks, the switch and the ports at each end.

### How long can an Ethernet cable be?

100 meters, or 328 feet, for Cat 5e, Cat 6 and Cat 6A at their rated speeds. That total includes patch cables at both ends. Cat 8 is limited to 30 meters at 25 and 40 Gbps.

## Sources

- IEEE 802.3bz-2016: 2.5 Gb/s and 5 Gb/s Operation, Types 2.5GBASE-T and 5GBASE-T, IEEE Standards Association: https://standards.ieee.org/ieee/802.3bz/6130/
- Will My Existing Cable Plant Support 2.5/5GBASE-T?, Fluke Networks: https://www.flukenetworks.com/blog/cabling-chronicles/will-my-existing-cable-plant-support-255gbase-t
- 10GBASE-T Field Testing Requirements, Fluke Networks: https://www.flukenetworks.com/knowledge-base/applicationstandards-articles-copper/10gbase-t-field-testing-requirements
- Cat 8 Ethernet Cable Fact Sheet, Fluke Networks: https://www.flukenetworks.com/knowledge-base/applicationstandards-articles-copper/category-8-cabling-fact-sheet
- Tips to Identify Copper Clad Aluminium (CCA) Cables, Fluke Networks: https://www.flukenetworks.com/blog/cabling-chronicles/cca-not-worth-savings-or-risk
- The ANSI/TIA 568 Series of Specifications: What Is Most Important to Know for Copper, trueCABLE: https://www.truecable.com/blogs/cable-academy/the-ansi-tia-568-series-of-specifications-what-is-most-important-to-know-for-copper
- Can I connect my eeros with Ethernet?, eero Support: https://eero.com/support/articles/can-i-connect-my-eeros-with-ethernet