Will this work with Verizon FIOS?

No sir, this is a cable modem. Verizon FiOS is a fiber optic service. Additionally, with Verizon FiOS they typically run a fiber line to an Optical Network Terminal installed in your house/garage which does not require a traditional modem; just a router with a coaxial or ethernet WAN port. I used to do tech support for Frontier Communications, a company which bought out Verizon's FiOS operations in CA, TX and FL, and if a customer was on Ethernet WAN they could run any router they wanted provided it could handle the speeds. If they have you configured on coaxial though, good luck finding a router with a coaxial WAN input. In those instances you're better off using a VZ provided router.

will this work with my spectrum internet? 300-400 mbps

It did not work for me with Comcast. Even though it explicitly states it will. Neither Comcast would help and Netgear wanted me to pay for their tech support service in order to verify it didn’t work. Newegg wouldn’t refund me either. I wouldn’t buy it.

Will this work with centurylink as the Internet provider?

Yes, as long as the service they are providing is cable internet and not satellite internet.

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NETGEAR DOCSIS 3.0 AC1200 High Speed WiFi Cable Modem (C6220)

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Compatible with Xfinity from Comcast, Spectrum, Cox, CableONE & more.
Three-in-one DOCSIS 3.0 Cable Modem + AC1200 WiFi Router+ 2 Gigabit Wired Switch
Up to 343Mbps modem speed and Dual-Band AC1200 (2.4GHz & 5GHz) WiFi speed. 8x4 channel bonding/ Approved for plans up to 100 Mbps.
DOCSIS 3.0 unleashes 8x faster download speeds than DOCSIS 2.0
NETGEAR Genie App - Content filtering Parental Controls allow you to manage your network from anywhere.

Overview

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Faster Connections. Effortless Streaming.
The NETGEAR C6220 is CableLabs DOCSIS® 3.0 two-in-one cable modem + WiFi router. This cable modem router gives you high-speed Internet connection with combined speeds of up to 1.2Gbps with AC12000 WiFi. This cable modem router supports 8 download & 4 upload channels for efficient & reliable Internet access and is compatible with current and next generation WiFi devices. Save up to $120 a year by eliminating Internet service provider rental fees. Works with cable Internet providers like XFINITY® from Comcast, Spectrum®, Cox® and more.

Model
Brand	NETGEAR
Model	C6220-100NAS

Details
Type	Cable Modem
Interface	Ethernet Port
Standards	1 x USB 2.0 port 1 x coaxial port for cable Internet IEEE 802.11 b/g/n 2.4 GHz IEEE 802.11 a/n/ac 5 GHz 2 x 10/100/1000 LAN Gigabit Ethernet ports with auto-sensing technology

Features
Features	Security Wi-Fi Protected Access (WPA / WPA2-AES) Double firewall protection (SPI and NAT firewall) Denial-of-Service (DoS) attack prevention Push 'N' Connect-Easy push button WiFi connections (WPS) Technical Specifications Built-in high-speed 8x4 CableLabs certified DOCSIS 3.0 Modem 8 downstream & 4 upstream channels AC1200 simultaneous Dual Band WiFi-2.4 & 5 GHz WiFi Transmitters / Receivers (Tx/Rx)- 2x2 (2.4 GHz) + 2x2 (5 GHz) Memory-128 MB flash and 128 MB RAM IPv6 Supported (Internet Protocol Version 6) On/off LED light switch System Requirements Cable broadband Internet service Please check your cable Internet service provider web site for data speed tier compatibility Microsoft Windows 7, 8, 10, Vista, XP, 2000, Mac OS, UNIX, or Linux Microsoft Internet Explorer 5.0, Firefox 2.0, Safari 1.4, or Google Chrome 11.0 browsers or higher Use with an 802.11ac adapter like NETGEAR A6210 for maximum performance Dimensions: 2.25" x 9.25" x 6.10" Weight: 0.95 lb. Built-in DOCSIS 3.0 cable modem AC1200 Dual Band WiFi-300+900 Mbps DOCSIS 3.0 8x faster Cable Internet speeds-Up to 340 Mbps Eliminate monthly rental fees Works with cable Internet providers like XFINITY from Comcast & more

Packaging
Package Contents	AC1200 Cable Modem Router (C6220) Ethernet cable Quick install guide Power adapter

Additional Information
First Listed on Newegg	February 17, 2017

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

This item is covered by Newegg.com's 30-Day Return Policy.
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NETGEAR DOCSIS 3.0 AC1200 High Speed WiFi Cable Modem (C6220)

Learn more about the Netgear Inc. C6220-100NAS

Customer Reviews of the Netgear Inc. C6220-100NAS

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16825124029

NETGEAR DOCSIS 3.0 AC1200 High Speed WiFi Cable Modem (C6220)

Learn more about the Netgear Inc. C6220-100NAS

Customer Reviews of the Netgear Inc. C6220-100NAS

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info