diff --git a/bugsink/settings.py b/bugsink/settings.py
index af59eb9..7ccdb71 100644
--- a/bugsink/settings.py
+++ b/bugsink/settings.py
@@ -134,9 +134,11 @@ STATICFILES_DIRS = [
 # no support for uuid in this setting yet (https://code.djangoproject.com/ticket/32577) so we leave it as-is
 DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
 
+# ###################### MOST PER-SITE CONFIG BELOW THIS LINE ###################
 
-# {PROTOCOL}://{PUBLIC_KEY}:{SECRET_KEY}@{HOST}{PATH}/{PROJECT_ID}
-SENTRY_DSN = os.getenv("SENTRY_DSN")  # "http://ignored_public_key:ignored_secret_key@127.0.0.1:9000/1"
+
+# {PROTOCOL}://{PUBLIC_KEY}:{DEPRECATED_SECRET_KEY}@{HOST}{PATH}/{PROJECT_ID}
+SENTRY_DSN = os.getenv("SENTRY_DSN")
 
 
 if SENTRY_DSN is not None:
@@ -146,3 +148,5 @@ if SENTRY_DSN is not None:
         auto_session_tracking=False,
         traces_sample_rate=0,
     )
+
+BASE_URL = "http://glitchtip:9000"  # no trailing slash
diff --git a/compat/dsn.py b/compat/dsn.py
index d9c6807..0a15a61 100644
--- a/compat/dsn.py
+++ b/compat/dsn.py
@@ -1,6 +1,16 @@
 import urllib.parse
 
 
+def _colon_port(port):
+    return ":" + str(port) if port else ""
+
+
+def build_dsn(base_url, project_id, public_key):
+    parts = urllib.parse.urlsplit(base_url)
+    return (f"{ parts.scheme }://{ public_key }@{ parts.hostname }{ _colon_port(parts.port) }" +
+            f"{ parts.path }/{ project_id }")
+
+
 def _get_url(sentry_dsn, ingest_method):
     # https://github.com/getsentry/develop/blob/b24a602de05b/src/docs/sdk/overview.mdx#L94
 
@@ -10,7 +20,7 @@ def _get_url(sentry_dsn, ingest_method):
     path_before_api, project_id = parts.path.rsplit("/", 1)
 
     return (
-        parts.scheme + "://" + parts.hostname + (":" + str(parts.port) if parts.port else "") +
+        parts.scheme + "://" + parts.hostname + _colon_port(parts.port) +
         path_before_api + "/api/" + project_id + "/" + ingest_method + "/")
 
 
diff --git a/compat/tests.py b/compat/tests.py
index 90009e3..7bb4128 100644
--- a/compat/tests.py
+++ b/compat/tests.py
@@ -2,12 +2,26 @@ from unittest import TestCase
 import datetime
 from django.test import override_settings
 
-from .dsn import get_store_url, get_envelope_url, get_header_value
+from .dsn import build_dsn, get_store_url, get_envelope_url, get_header_value
 from .auth import parse_auth_header_value
 from .timestamp import parse_timestamp
 
 
 class DsnTestCase(TestCase):
+    def test_build_dsn(self):
+        self.assertEquals(
+            "https://public_key@hosted.bugsink/1",
+            build_dsn("https://hosted.bugsink", "1", "public_key"))
+
+        self.assertEquals(
+            "https://public_key@hosted.bugsink/foo/1",
+            build_dsn("https://hosted.bugsink/foo", "1", "public_key"))
+
+    def test_build_dsn_non_default_port(self):
+        self.assertEquals(
+            "https://public_key@hosted.bugsink:9000/1",
+            build_dsn("https://hosted.bugsink:9000", "1", "public_key"))
+
     def test_get_store_url(self):
         self.assertEquals(
             "https://hosted.bugsink/api/1/store/",
diff --git a/projects/admin.py b/projects/admin.py
index eaee937..0d9bf42 100644
--- a/projects/admin.py
+++ b/projects/admin.py
@@ -5,4 +5,10 @@ from .models import Project
 
 @admin.register(Project)
 class ProjectAdmin(admin.ModelAdmin):
-    pass
+    list_display = [
+        'name',
+        'dsn',
+    ]
+    readonly_fields = [
+        'dsn',
+    ]
diff --git a/projects/models.py b/projects/models.py
index c59ddb7..26edd21 100644
--- a/projects/models.py
+++ b/projects/models.py
@@ -1,6 +1,9 @@
 import uuid
 
 from django.db import models
+from django.conf import settings
+
+from compat.dsn import build_dsn
 
 
 class Project(models.Model):
@@ -27,9 +30,9 @@ class Project(models.Model):
     def __str__(self):
         return self.name
 
-    def get_dsn(self):
-        # TODO, because the server needs to know its own address
-        return get_dsn()
+    @property
+    def dsn(self):
+        return build_dsn(settings.BASE_URL, self.id, self.sentry_key)
 
     """
     # TODO is this even more efficient?