Comcast Cable Corporation — 3 prefixes (MA-L)

A MAC address starting D8:9C:8E, F0:61:F3, or F0:46:3B belongs to Comcast Cable Corporation, the Xfinity-branded ISP subsidiary of Comcast Corporation, and is typically seen on cable modems or combined modem/router gateways Comcast issues to residential and business subscribers.

All three prefixes are individual MA-L (24-bit) block assignments registered under the same organization name and the same street address, corroborated by two independent third-party OUI databases in addition to the repo's local IEEE registry mirror. Holding multiple separate OUI blocks under one consistent name is itself a positive signal of company substance, distinct from a bare single-block registration.

The registered address, 1800 Arch Street, Philadelphia, PA, is the Comcast Technology Center — a real, independently verifiable landmark building adjacent to Comcast Corporation's Philadelphia headquarters, not a shell or PO-box pattern.

No source found in this pass ties any of the three specific prefixes to a named hardware model, chipset, or ODM partner, so device identification beyond "Comcast/Xfinity-issued CPE" stays Likely rather than Confirmed. No security advisories or abuse reports were found specific to these OUIs.

IEEE assignment

D8:9C:8E, F0:61:F3, F0:46:3B → Comcast Cable Corporation, registered Philadelphia, PA, US [Confirmed] — the IEEE MA-L registry (lines 8620, 22550, 33201)

Registry / block size

MA-L (24-bit OUI); 3 prefixes identified in this pass [Confirmed] — the IEEE MA-L registry; corroborated by https://api.maclookup.app/v2/macs/D8:9C:8E, https://api.maclookup.app/v2/macs/F0:61:F3, https://api.maclookup.app/v2/macs/F0:46:3B, https://www.netify.ai/resources/macs/brands/xfinity

HQ / registered address

1800 Arch Street, Philadelphia, PA 19103, US — Comcast Technology Center, adjacent to Comcast Corporation's Philadelphia HQ [Confirmed] — the IEEE MA-L registry; https://en.wikipedia.org/wiki/Comcast_Technology_Center

Company status

active [Confirmed] — https://en.wikipedia.org/wiki/Xfinity

Device types

cable modems and residential/business gateways deployed by Comcast (Xfinity brand); no specific model confirmed for these three prefixes [Likely] — https://www.xfinity.com/support/articles/broadband-gateways-userguides

Notable products

Xfinity-branded customer-premises equipment fleet [Likely] — https://en.wikipedia.org/wiki/Xfinity

Verified sample prefixes (all MA-L, Comcast Cable Corporation)

D8:9C:8E, F0:61:F3, F0:46:3B [Confirmed] — the IEEE MA-L registry; maclookup.app API

Registration date

not published — IEEE's public OUI data carries no assignment/registration date field; maclookup.app's "updated" timestamp on D8:9C:8E is a third-party database-refresh artifact, not an IEEE date [Unknown, by design] — https://api.maclookup.app/v2/macs/D8:9C:8E

Special note

three separate OUI assignments under one consistent org/address is a positive substance signal for a large ISP's self-registered CPE fleet; no device-model or security-specific findings surfaced for these exact prefixes in this pass [Confirmed substance / Unknown device-model and security specifics] — see citations above

Related vendors

Comcast Corporation (parent company)

Analyst note

treat these prefixes as Comcast/Xfinity-issued ISP customer-premises equipment (modem/gateway class) for network inventory purposes; do not assume a specific hardware model without independent confirmation.