diff --git a/docs/guides/administration/.pages b/docs/guides/administration/.pages
index bed2ae90..33706d19 100644
--- a/docs/guides/administration/.pages
+++ b/docs/guides/administration/.pages
@@ -8,6 +8,7 @@ nav:
   - configuring-secret-management.md
   - configuring-internal-ca.md
   - configuring-http-proxy.md
+  - allowing-outbound-traffic.md
   - configuring-timezone.md
   - configuring-banner.md
   - configuring-vulnerability-sources.md
diff --git a/docs/guides/administration/allowing-outbound-traffic.md b/docs/guides/administration/allowing-outbound-traffic.md
new file mode 100644
index 00000000..4d636990
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+++ b/docs/guides/administration/allowing-outbound-traffic.md
@@ -0,0 +1,89 @@
+# Allowing outbound traffic
+
+The API server makes outbound HTTPS calls to mirror [vulnerability data
+sources](configuring-vulnerability-sources.md), query analyzers, and fetch package
+metadata from repositories. If a firewall or proxy restricts egress, allow the API
+server to reach the hosts in this guide.
+
+All default endpoints use HTTPS on TCP port 443. The frontend is a static app served
+to the browser and does not originate these calls.
+
+The in-repo [`services.bom.json`](https://github.com/DependencyTrack/dependency-track/blob/main/apiserver/src/main/resources/services.bom.json)
+file is the source of truth for default service URLs. Release SBOMs merge that file
+into the published `bom.json`. Repository URLs, analyzer base URLs, and notification
+destinations that you set in **Administration** are extra hosts. They are not in
+`services.bom.json`.
+
+If outbound traffic must go through a proxy, see [Configuring an HTTP
+proxy](configuring-http-proxy.md). If the proxy intercepts TLS, see [Configuring
+internal CA trust](configuring-internal-ca.md). If the API server has no outbound
+internet access, see [Running air-gapped](running-air-gapped.md).
+
+## Vulnerability data sources and analyzers
+
+| Service | Host | Default URL |
+|:--------|:-----|:------------|
+| NVD | `nvd.nist.gov` | `https://nvd.nist.gov/feeds` |
+| GitHub Advisories | `api.github.com` | `https://api.github.com/graphql` |
+| OSV | `osv-vulnerabilities.storage.googleapis.com` | `https://osv-vulnerabilities.storage.googleapis.com` |
+| OSS Index | `ossindex.sonatype.org` | `https://ossindex.sonatype.org/api/v3/component-report` |
+| Snyk | `api.snyk.io` | `https://api.snyk.io` |
+| VulnDB | `vulndb.cyberriskanalytics.com` | `https://vulndb.cyberriskanalytics.com/api/v1/` |
+| EPSS | `epss.empiricalsecurity.com` | `https://epss.empiricalsecurity.com/epss_scores-current.csv.gz` |
+
+OSS Index, Snyk, and VulnDB are analyzers. They call the vendor API during
+vulnerability analysis when you enable them. NVD, GitHub Advisories, OSV, and EPSS
+are mirrored on a schedule.
+
+## Package repositories
+
+Dependency-Track queries these default registries for latest-version metadata. You
+can add, replace, or disable repositories in **Administration > Repositories**.
+
+| Ecosystem | Host | Default URL |
+|:----------|:-----|:------------|
+| Cargo (Rust) | `index.crates.io` | `https://index.crates.io` |
+| Composer (PHP) | `repo.packagist.org` | `https://repo.packagist.org/p/` |
+| Gem (Ruby) | `rubygems.org` | `https://rubygems.org/api/v1/versions` |
+| GitHub (Actions) | `api.github.com` | `https://api.github.com/repos/` |
+| Go Modules | `proxy.golang.org` | `https://proxy.golang.org/` |
+| Hex (Erlang/Elixir) | `hex.pm` | `https://hex.pm/api/packages` |
+| Maven Central | `repo1.maven.org` | `https://repo1.maven.org/maven2` |
+| Atlassian Maven | `packages.atlassian.com` | `https://packages.atlassian.com/content/repositories/atlassian-public/` |
+| JBoss Maven | `repository.jboss.org` | `https://repository.jboss.org/nexus/content/repositories/releases/` |
+| Clojars | `repo.clojars.org` | `https://repo.clojars.org/` |
+| Google Maven | `maven.google.com` | `https://maven.google.com/` |
+| npm | `registry.npmjs.org` | `https://registry.npmjs.org/-/package/` |
+| NuGet | `api.nuget.org` | `https://api.nuget.org/v3-flatcontainer/` |
+| PyPI | `pypi.org` | `https://pypi.org/pypi/` |
+| CPAN (Perl) | `fastapi.metacpan.org` | `https://fastapi.metacpan.org/v1/` |
+| Hackage (Haskell) | `hackage.haskell.org` | `https://hackage.haskell.org/` |
+| Nixpkgs | `channels.nixos.org` | `https://channels.nixos.org/nixpkgs-unstable/packages.json.br` |
+
+## Telemetry
+
+When you enable anonymous usage telemetry, the API server posts to
+`https://metrics.dependencytrack.org`.
+
+## Other destinations you configure
+
+These hosts are not defaults in `services.bom.json`. Allow them only for the
+integrations you turn on.
+
+| Integration | Hosts |
+|:------------|:------|
+| [KEV catalogs](configuring-kev-sources.md) | `www.cisa.gov`, `raw.githubusercontent.com`, `api.vulncheck.com`, plus the storage host VulnCheck returns for the catalog download |
+| [Trivy](../../reference/analyzers.md#trivy) | The Trivy server you operate |
+| [OIDC](configuring-oidc.md) | Your identity provider |
+| [LDAP](configuring-ldap.md) | Your directory server (TCP 389 or 636, not 443) |
+| Notification publishers | Slack, Teams, email, Jira, webhooks, or other destinations you configure |
+| Private package registries | Any repository URL you add in **Administration > Repositories** |
+
+## See also
+
+- [Configuring an HTTP proxy](configuring-http-proxy.md)
+- [Configuring internal CA trust](configuring-internal-ca.md)
+- [Configuring vulnerability sources](configuring-vulnerability-sources.md)
+- [Configuring KEV sources](configuring-kev-sources.md)
+- [Running air-gapped](running-air-gapped.md)
+- [Package repositories](../../reference/datasources/repositories.md)
diff --git a/docs/guides/administration/running-air-gapped.md b/docs/guides/administration/running-air-gapped.md
index fb2093c4..dbc7c803 100644
--- a/docs/guides/administration/running-air-gapped.md
+++ b/docs/guides/administration/running-air-gapped.md
@@ -60,6 +60,7 @@ air-gapped environment, turn these analyzers off.
 
 ## See also
 
+- [Allowing outbound traffic](allowing-outbound-traffic.md)
 - [Configuring vulnerability sources](configuring-vulnerability-sources.md)
 - [Configuring an HTTP proxy](configuring-http-proxy.md)
 - [Configuring internal CA trust](configuring-internal-ca.md)