SUBJECT: The Rule on ‘The Service by Publication’ in Actions In Rem and Quasi In Rem

I. Introduction

This memorandum exhaustively examines the rule on service by publication within the Philippine legal system, specifically in the context of actions in rem and quasi in rem. Service by publication is a mode of substituted service sanctioned under the Rules of Court when personal service or other forms of substituted service cannot be effected with reasonable diligence. It is a critical procedural mechanism that balances the constitutional requirement of due process—the right to be heard—with the practical necessity of adjudicating claims against unknown parties, non-residents, or individuals whose whereabouts are unknown, thereby allowing a court to acquire jurisdiction over the res (the thing or property) subject of the litigation. This memo will delineate the legal foundations, specific requisites, procedural steps, and jurisprudential interpretations governing this extraordinary mode of service.

II. Legal Foundation and Statutory Basis

The primary statutory basis for service by publication is found in the 1997 Rules of Civil Procedure, specifically under Rule 14 (Summons) and Rule 15 (Motion). The relevant provisions are:
Section 14, Rule 14: “In any action where the defendant is designated as an unknown owner, or the like, or whenever his whereabouts are unknown and cannot be ascertained by diligent inquiry, service* may, by leave of court, be effected upon him by publication in a newspaper of general circulation and in such places and for such time as the court may order.”
Section 15, Rule 14: “When the defendant does not reside and is not found in the Philippines, and the action affects the personal status of the plaintiff or relates to, or the subject of which is, property within the Philippines, in which the defendant has or claims a lien or interest, actual or contingent, or in which the relief demanded consists, wholly or in part, in excluding the defendant from any interest therein, or the property of the defendant has been attached within the Philippines, service may, by leave of court, be effected out of the Philippines by personal service as under Section 6; or by publication* in a newspaper of general circulation in such places and for such time as the court may order, in which case a copy of the summons and order of the court shall be sent by registered mail to the last known address of the defendant.”
These rules are construed strictly, as they are in derogation of the usual method of personal service.

III. Distinction: Actions In Rem, Quasi In Rem, and In Personam

Understanding the proper application of service by publication necessitates a clear distinction between types of actions:
Action In Rem: An action against the whole world, primarily concerned with the status of a person or a thing. The judgment binds all persons, known or unknown. Examples include cadastral or land registration proceedings, judicial foreclosure of mortgage where the defendant is unknown, or probate proceedings. Here, jurisdiction is acquired by service by publication because the court’s authority is over the res*.
Action Quasi In Rem: An action based on a claim against a specific person, but the object is to apply that person’s property in the court’s custody to the satisfaction of the claim. The judgment binds only the parties to the action and those with notice. Examples include foreclosure of a real estate mortgage (where the defendant is named) or an action for attachment of property. Jurisdiction over the res is secured by its attachment or custodia legis, and service by publication (or other means) on the defendant is required to satisfy due process*.
Action In Personam: An action against a specific person to enforce personal obligations. The judgment binds only the parties and their successors-in-interest. Service by publication is generally not sufficient to confer jurisdiction in a purely in personam action, unless the action is also quasi in rem* or falls under a specific statutory exception.

IV. Requisites for Service by Publication

For service by publication to be validly ordered by the court, the following cumulative requisites must be strictly satisfied:

The action is either in rem or quasi in rem. It is generally not available for purely in personam actions.

The defendant is either: (a) designated as an unknown owner; (b) his identity is unknown; or (c) his whereabouts are unknown and cannot be ascertained by diligent inquiry.

A diligent inquiry must first be made to locate the defendant. Mere allegations of unknown whereabouts are insufficient; the plaintiff must present proof of earnest efforts to locate the defendant (e.g., sworn statements from persons who knew the defendant, certifications from the barangay, last known address verifications).

Leave of court must be secured. The plaintiff must file a motion for leave to effect service by publication, supported by an affidavit stating the grounds and detailing the diligent inquiry undertaken.

The publication must be in a newspaper of general circulation in the province or city as directed by the court, and for the period prescribed by the court.

V. Procedural Steps for Implementation

Filing of Complaint: The plaintiff files a complaint falling under in rem or quasi in rem.

Motion and Affidavit: Prior to or simultaneous with an application for a writ of attachment (if quasi in rem), the plaintiff files a verified motion for leave to serve summons by publication. This must be accompanied by an affidavit of diligent inquiry.

Judicial Discretion: The court evaluates the motion and affidavit. The grant of leave is discretionary but must be based on a finding of compliance with the requisites.

Order for Publication: If granted, the court issues an order specifying the newspaper, frequency, and duration of publication (typically once a week for at least three consecutive weeks).

Compliance and Proof of Service: The plaintiff ensures publication as ordered. The newspaper’s affidavit of publication and a copy of the published summons are then filed with the court as proof of service.

Registered Mail (for Section 15, Rule 14): In cases under Section 15 (non-resident defendant), a copy of the summons and court order must also be sent by registered mail to the defendant’s last known address, if any.

VI. Jurisprudential Doctrines and Interpretations

Philippine jurisprudence has consistently emphasized the following principles:
Strict Compliance: The statutory requirements are mandatory and must be strictly construed. Failure to prove diligent inquiry renders the service by publication void (Uy v. First Metro Integrated Steel Corp.*).
Diligent Inquiry Defined: Diligent inquiry* means a serious effort to discover the defendant’s whereabouts through all reasonable means available under the circumstances. Inquiries with relatives, neighbors, last employers, and local government units are standard.
Due Process Core: The essence of service by publication is to reasonably ensure notice, or at least to constructively serve as a substitute, fulfilling the demands of due process in actions against the res (Ortigas & Company Limited Partnership v. Velasco*).
Void Judgment: Any judgment rendered by a court without valid jurisdiction over the defendant, due to improper service of summons, is void and can be attacked collaterally* at any time.
Not for In Personam: Where the main relief sought is in personam (e.g., payment of money, specific performance), service by publication will not confer jurisdiction, even if property is attached (Davao Light & Power Co., Inc. v. Court of Appeals*).

VII. Comparative Analysis: Service by Publication in In Rem vs. Quasi In Rem Actions

The following table compares the application of the rule in the two primary contexts:

Aspect	In Rem Actions	Quasi In Rem Actions
Object of the Action	To determine the status of a thing or a person (e.g., ownership, annulment of title, probate) or to affect the interests of all persons in a thing.	To apply a specific defendant’s property, already under the court’s custody via attachment or similar process, to the satisfaction of a personal claim against that defendant.
Defendant(s)	Often “the whole world,” or specifically named parties plus “all persons claiming interest.”	A specifically named defendant against whom the plaintiff has a personal claim.
Basis of Jurisdiction	Jurisdiction over the res (property or status) located within the court’s territorial jurisdiction.	Jurisdiction is based on seizure or attachment of the res located within the court’s territory, coupled with service on the defendant.
Primary Role of Publication	The primary method to confer jurisdiction and satisfy due process as against unknown claimants or the world at large.	A method of substituted service to notify the named defendant and satisfy due process, given that jurisdiction over the person is not required, only over the res.
Judgment Effect	Binds the entire world with respect to the res.	Binds only the parties to the action and those with notice concerning the disposition of the attached res. It does not bar a subsequent in personam action for a deficiency judgment unless so intended.
Common Examples	Land registration and cadastral cases; judicial foreclosure where mortgagee is unknown; escheat proceedings; cancellation of patent or title.	Foreclosure of real estate mortgage (if defendant is named); actions for attachment of property to secure a money claim; actions to enforce a lien on specific property.

VIII. Common Pitfalls and Defects

Litigants and courts must avoid these common defects which invalidate service by publication:
Conclusory Affidavit: An affidavit of diligent inquiry* that merely states conclusions (“whereabouts are unknown”) without detailing the specific steps taken.
* Premature Publication: Effecting publication without first securing a court order granting leave.
* Improper Newspaper: Publication in a newspaper not of general circulation in the place specified by the court.
* Insufficient Publication Period: Failure to publish for the full period ordered by the court.
Lack of Registered Mail (if required): For actions under Section 15, Rule 14*, failure to send copies via registered mail to the last known address.
Misapplication to In Personam Actions: Attempting to use publication to acquire jurisdiction* in a purely personal action.

IX. Recent Developments and Practical Considerations

While the core rules remain stable, practical considerations include:
Use of Technology: While not yet supplanting publication, courts may consider digital footprints as part of a diligent inquiry*. However, publication in a newspaper remains the mandated form.
* Heightened Scrutiny: Appellate courts continue to strictly scrutinize affidavits of diligent inquiry, especially in cases where ancestral property or rights of absent heirs are involved.
Interplay with Property Registration Decree: In cases involving real property, the rules on service by publication under the Rules of Court work in tandem with the publication requirements under the Property Registration Decree (P.D. No. 1529) for registration and cadastral* cases.

X. Conclusion

Service by publication is a vital but exceptional procedural tool in Philippine remedial law. Its valid implementation is strictly confined to actions in rem and quasi in rem. The cornerstone of its validity is a genuine and demonstrable diligent inquiry to locate the defendant, coupled with strict adherence to the court-ordered publication requirements. Failure in any material aspect renders the service, and consequently any resulting judgment, void for lack of jurisdiction. Legal practitioners must exercise utmost care in preparing the necessary motion and affidavit to justify this mode of service, ensuring that the constitutional guarantee of due process is constructively served while enabling the courts to adjudicate upon properties within their authority.