diff --git a/dev/build/gunicorn.conf.py b/dev/build/gunicorn.conf.py
index cabbee0b1e..6666a0d37d 100644
--- a/dev/build/gunicorn.conf.py
+++ b/dev/build/gunicorn.conf.py
@@ -64,18 +64,21 @@ def _describe_request(req):
     start and end of handling a request. E.g., do not include a timestamp.
     """
     client_ip = "-"
+    asn = "-"
     cf_ray = "-"
     for header, value in req.headers:
         header = header.lower()
         if header == "cf-connecting-ip":
             client_ip = value
+        elif header == "x-ip-src-asnum":
+            asn = value
         elif header == "cf-ray":
             cf_ray = value
     if req.query:
         path = f"{req.path}?{req.query}"
     else:
         path = req.path
-    return f"{req.method} {path} (client_ip={client_ip}, cf_ray={cf_ray})"
+    return f"{req.method} {path} (client_ip={client_ip}, asn={asn}, cf_ray={cf_ray})"
 
 
 def pre_request(worker, req):
diff --git a/ietf/utils/jsonlogger.py b/ietf/utils/jsonlogger.py
index b02cd7af2b..6502cab0cb 100644
--- a/ietf/utils/jsonlogger.py
+++ b/ietf/utils/jsonlogger.py
@@ -31,4 +31,5 @@ def add_fields(self, log_record, record, message_dict):
         log_record.setdefault("cf_connecting_ip", record.args["{cf-connecting-ip}i"])
         log_record.setdefault("cf_connecting_ipv6", record.args["{cf-connecting-ipv6}i"])
         log_record.setdefault("cf_ray", record.args["{cf-ray}i"])
+        log_record.setdefault("asn", record.args["{x-ip-src-asnum}i"])
         log_record.setdefault("is_authenticated", record.args["{x-datatracker-is-authenticated}o"])
diff --git a/k8s/nginx-logging.conf b/k8s/nginx-logging.conf
index 3c4ade4614..0bc7deca81 100644
--- a/k8s/nginx-logging.conf
+++ b/k8s/nginx-logging.conf
@@ -1,4 +1,6 @@
-# Define JSON log format - must be loaded before config that references it
+# Define JSON log format - must be loaded before config that references it.
+# Note that each line is fully enclosed in single quotes. Commas in arrays are
+# intentionally inside the single quotes.
 log_format  ietfjson  escape=json
   '{'
     '"time":"$${keepempty}time_iso8601",'
@@ -16,5 +18,6 @@ log_format  ietfjson  escape=json
     '"x_forwarded_proto":"$${keepempty}http_x_forwarded_proto",'
     '"cf_connecting_ip":"$${keepempty}http_cf_connecting_ip",'
     '"cf_connecting_ipv6":"$${keepempty}http_cf_connecting_ipv6",'
-    '"cf_ray":"$${keepempty}http_cf_ray"'
+    '"cf_ray":"$${keepempty}http_cf_ray",'
+    '"asn":"$${keepempty}http_x_ip_src_asnum"'
   '}';