Comcast is the largest cable and internet provider in the United States, and under the Xfinity brand name, it serves millions of California households. For attorneys and litigation teams, Comcast is also one of the highest-volume subpoena targets in the state. ISP subscriber identification requests — linking an IP address to a physical person — are a daily occurrence in California litigation. Serving Comcast correctly starts with naming the right entity, because “Comcast” and “Xfinity” are brand names, not legal entities.
The Correct Legal Entity
The correct entity for most California litigation is Comcast Cable Communications, LLC. This is the operating subsidiary that provides cable, internet, and phone services to California customers under the Xfinity brand.
Do not name Comcast Corporation unless your case specifically involves the parent company. Comcast Corporation is the publicly traded holding company (NASDAQ: CMCSA) headquartered in Philadelphia. It owns NBCUniversal, Sky, and various other media and entertainment properties in addition to the cable business. For consumer disputes, service complaints, subscriber data subpoenas, and most California litigation, the correct defendant or subpoena recipient is Comcast Cable Communications, LLC.
Also be aware that Xfinity is a trade name, not a legal entity. You cannot serve “Xfinity” — it does not exist as a corporation, LLC, or any other registered entity. Xfinity is the consumer-facing brand for Comcast Cable Communications, LLC.
Search bizfileonline.sos.ca.gov to confirm the current registered agent before serving.
Where to Serve
Registered agent: CT Corporation System
Address: 330 N. Brand Blvd., Suite 700, Glendale, CA 91203
CT Corporation handles registered agent services for Comcast Cable Communications, LLC in California. The Glendale office is CT’s primary California service point, located on the seventh floor of the building at 330 N. Brand Boulevard.
CT Corporation accepts service of process during normal business hours. Present the documents identifying Comcast Cable Communications, LLC as the target entity.
What Documents Are Commonly Served
Comcast generates an exceptionally high volume of service of process, driven largely by subpoenas:
• Subpoenas for subscriber information — This is the dominant category. In litigation ranging from copyright infringement to defamation to criminal investigations, attorneys need to identify the person behind an IP address. Comcast, as the ISP, holds the subscriber records. These subpoenas are served on the registered agent and are among the most common documents served on any entity in California.
• Subpoenas for call and communication records — For Xfinity Voice (VoIP) customers, subpoenas seeking call logs, voicemail records, and account activity.
• Consumer complaints — Billing disputes, service quality claims, early termination fee challenges, and unfair business practices allegations under California Business and Professions Code Section 17200.
• Small claims filings — Individual consumers frequently name Comcast in small claims actions over billing, service, and equipment disputes.
• ADA and accessibility claims — Claims alleging that Comcast’s services or facilities fail to comply with disability access requirements.
How We Handle It
CT Corporation at 330 N. Brand Blvd. in Glendale is a high-volume service location that we cover regularly. For Comcast subpoenas specifically, the volume is high enough that CT’s staff is well-practiced in accepting these documents. We ensure the proof of service correctly identifies the entity as Comcast Cable Communications, LLC and documents the acceptance at the CT Corporation office.
For attorneys handling ISP subscriber identification cases, timing matters. IP address assignment records may be purged after a certain retention period. Prompt service of the subpoena through the registered agent helps ensure the records still exist when Comcast’s legal team processes the request.
Service Level | Timeframe | Price
Standard | 10 business days | \$99
Expedited | 3 business days | \$150
Rush | 24 hours | \$175
Court Filing Add-on | — | +\$30
