diff --git a/src/psyc/cli.py b/src/psyc/cli.py
index 8af34f8..12ecdfe 100644
--- a/src/psyc/cli.py
+++ b/src/psyc/cli.py
@@ -9,6 +9,7 @@ import uvicorn
 
 from psyc import db, log
 from psyc.lines import classify, courier, route, scout, seal
+from psyc.lines import map as map_line
 from psyc.models import Outcome
 from psyc.result import Err, Ok
 
@@ -65,6 +66,30 @@ def classify_all() -> None:
     typer.echo(f"classified {len(cases)} case(s).")
 
 
+@app.command("map-case")
+def map_case(case_id: str) -> None:
+    case_result = db.get_case(case_id)
+    if isinstance(case_result, Err):
+        typer.echo(f"error: {case_result.reason}", err=True)
+        raise typer.Exit(1)
+    case = map_line.resolve(case_result.value)
+    db.upsert_case(case)
+    typer.echo(f"mapped {case.case_id}: country={case.victim.country or '—'} ips={case.observables.ips}")
+
+
+@app.command("map-all")
+def map_all(limit: int = typer.Option(50, help="max cases to process this run")) -> None:
+    cases = db.list_cases(limit=limit)
+    resolved = 0
+    for c in cases:
+        before = c.victim.country
+        mapped = map_line.resolve(c)
+        if mapped.victim.country != before:
+            db.upsert_case(mapped)
+            resolved += 1
+    typer.echo(f"resolved {resolved} new country/ies across {len(cases)} case(s).")
+
+
 @app.command("seal-keys-gen")
 def seal_keys_gen(recipient: str) -> None:
     path = seal.generate_recipient_keys(recipient)
@@ -202,6 +227,9 @@ def demo() -> None:
         f"{case.classification.severity.value if case.classification.severity else '—'} / "
         f"TLP:{case.classification.tlp.value}"
     )
+    case = map_line.resolve(case)
+    db.upsert_case(case)
+    typer.echo(f"  + mapped: hosting country = {case.victim.country or '—'}")
     plaintext = case.model_dump_json().encode("utf-8")
     metadata = dict(
         case_id=case.case_id,
diff --git a/src/psyc/lines/map.py b/src/psyc/lines/map.py
new file mode 100644
index 0000000..7a69dfd
--- /dev/null
+++ b/src/psyc/lines/map.py
@@ -0,0 +1,90 @@
+"""Mapline — victim / actor / jurisdiction resolution.
+
+Current worker: GeoResolver. Resolves a case's primary host to a country code
+via ip-api.com (free, no auth, 45 req/min). For malicious-infrastructure
+cases (URLhaus etc.) "victim.country" carries the hosting-country semantic;
+documented in psyc.lines.route's destination policy.
+"""
+
+from __future__ import annotations
+
+import socket
+from typing import Optional
+from urllib.parse import urlparse
+
+import httpx
+
+from psyc import log
+from psyc.models import Case
+from psyc.result import Err, Ok, Result
+
+
+_log = log.get(__name__)
+
+IP_API_URL = "http://ip-api.com/json/{ip}?fields=status,country,countryCode,isp,as,message"
+USER_AGENT = "psyc/0.1 (defensive CTI; hackathon prototype)"
+DNS_TIMEOUT_SECONDS = 3.0
+
+
+def resolve(case: Case) -> Case:
+    if case.victim.country:
+        return case
+    ip = _case_ip(case)
+    if not ip:
+        _log.info("map.geo.no_target", case_id=case.case_id)
+        return case
+    country_result = _geoip_country(ip)
+    if isinstance(country_result, Err):
+        _log.info("map.geo.skip", case_id=case.case_id, ip=ip, reason=country_result.reason)
+        return case
+    case.victim.country = country_result.value
+    if ip not in case.observables.ips:
+        case.observables.ips.append(ip)
+    _log.info("map.geo.resolved", case_id=case.case_id, ip=ip, country=country_result.value)
+    return case
+
+
+def _case_ip(case: Case) -> Optional[str]:
+    if case.observables.ips:
+        return case.observables.ips[0]
+    if case.observables.domains:
+        return _resolve_dns(case.observables.domains[0])
+    if case.observables.urls:
+        host = urlparse(case.observables.urls[0]).hostname
+        if host:
+            return _resolve_dns(host)
+    return None
+
+
+def _resolve_dns(host: str) -> Optional[str]:
+    if _looks_like_ip(host):
+        return host
+    prev_timeout = socket.getdefaulttimeout()
+    socket.setdefaulttimeout(DNS_TIMEOUT_SECONDS)
+    try:
+        return socket.gethostbyname(host)
+    except (socket.gaierror, socket.herror, socket.timeout):
+        return None
+    finally:
+        socket.setdefaulttimeout(prev_timeout)
+
+
+def _looks_like_ip(host: str) -> bool:
+    parts = host.split(".")
+    return len(parts) == 4 and all(p.isdigit() and 0 <= int(p) < 256 for p in parts)
+
+
+def _geoip_country(ip: str, timeout: float = 5.0) -> Result[str, str]:
+    try:
+        with httpx.Client(timeout=timeout, headers={"User-Agent": USER_AGENT}) as client:
+            r = client.get(IP_API_URL.format(ip=ip))
+            r.raise_for_status()
+            body = r.json()
+    except httpx.HTTPError as exc:
+        return Err(f"ip-api request failed: {exc}")
+    if body.get("status") != "success":
+        return Err(f"ip-api: {body.get('message', 'unknown error')}")
+    code = body.get("countryCode")
+    if not code:
+        return Err("ip-api returned no countryCode")
+    return Ok(code)