demmer.com — AI Site Grade

Analysis

The Hub Domain Serves a Default IIS Page While Dealer Sites Block Nearly Every AI Crawler

The Jack Demmer Automotive Group's primary domain demmer.com resolves to a bare IIS Windows Server default page with zero automotive content, while the actual dealer sites (jdemmerford.com, demmerlincoln.net) sit behind Akamai and return 403 to every major AI crawler except anthropic-ai.

Crawler Access

The root domain demmer.com (HTTP) returns a 200 status to all tested bots including GPTBot, ClaudeBot, and PerplexityBot, but the page contains 0 words of automotive content — only the IIS welcome screen. The HTTPS version of demmer.com fails entirely with an expired SSL certificate. The www.demmer.com subdomain serves a thin 51-word landing page with links to the dealer sites, but no robots.txt or llms.txt exists on any domain. The dealer sites behind Akamai block GPTBot, Google-Extended, PerplexityBot, and standard browsers with 403 responses. Only anthropic-ai passes through Akamai to reach the full dealer sites — a selective whitelist that gives Claude exclusive access to inventory and service content.

Cold-Knowledge Gap

The LLM model knows Jack Demmer Automotive Group as a family-owned dealership network in Wayne, Michigan, founded in the 1960s, selling Ford, Lincoln, and Mazda vehicles. This prior knowledge is more detailed than anything the actual domains serve. The model correctly identifies the brand's locations, founder, and reputation for community involvement. The gap: the actual website provides none of this information. A user asking an AI about "Demmer Automotive" would get a coherent brand summary from training data that the brand's own digital presence cannot corroborate or reinforce.

Schema Posture

No JSON-LD schema of any type was found on demmer.com, www.demmer.com, or the dealer sites. The dealer sites use the Dealer.com (DDC) platform (ddc-site class in HTML) which typically injects structured data via JavaScript, but the server-rendered HTML delivered to bots contains zero schema markup. No AutoDealer, LocalBusiness, or Organization schema is present in the raw HTML. The www.demmer.com page has no canonical tag, no Open Graph tags, and no heading structure beyond the bare navigation text.

External Signals

The brand has no discoverable external mentions in the web search results tested. No Reddit threads, no press coverage, no DealerRater or Google review pages surfaced. The Wayback Machine shows the www.demmer.com page has existed in essentially the same form since at least 2010 — a static HTML page with a copyright notice reading "2010 Demmer Automotive Group." The dealer sites are powered by Dealer.com's platform with Akamai CDN, suggesting a professional automotive digital infrastructure that is misconfigured to block the very crawlers that could index its inventory.

Findings

1. Hub domain demmer.com serves a default IIS page with zero automotive content High

   The primary domain demmer.com (HTTP) returns a 200 status to all bots but contains only the IIS welcome screen with 0 words of automotive content. The HTTPS version has an expired SSL certificate and fails entirely.

   What to change: Replace the IIS default page with a proper automotive landing page containing brand information, inventory links, and structured data. Renew the SSL certificate for HTTPS.

2. Dealer sites jdemmerford.com and demmerlincoln.net block most AI crawlers with 403 responses High

   The actual dealer sites behind Akamai return 403 Forbidden to GPTBot, Google-Extended, PerplexityBot, and standard browsers. Only anthropic-ai is whitelisted, giving Claude exclusive access to inventory and service content.

   What to change: Allow all major AI crawlers (GPTBot, Google-Extended, PerplexityBot) through Akamai to index inventory and service pages. Remove the selective whitelist that only permits anthropic-ai.

3. No robots.txt or llms.txt exists on any domain Medium

   None of the domains (demmer.com, jdemmerford.com, demmerlincoln.net) serve a robots.txt or llms.txt file. This leaves crawlers without guidance on allowed paths and misses an opportunity to provide AI-friendly content summaries.

   What to change: Create a robots.txt file for each domain to allow all crawlers and disallow only private areas. Create an llms.txt file with a summary of the business and links to key pages.

4. No JSON-LD schema of any type found on any domain High

   The server-rendered HTML delivered to bots contains zero schema markup. No AutoDealer, LocalBusiness, or Organization schema is present. The dealer sites use Dealer.com platform which typically injects schema via JavaScript, but that is not executed by crawlers.

   What to change: Add JSON-LD structured data for AutoDealer, LocalBusiness, and Organization to all pages. Ensure schema is server-side rendered so it is visible to crawlers.

5. www.demmer.com page is thin, outdated, and lacks metadata Medium

   The www.demmer.com page contains only 51 words, a copyright notice from 2010, and links to dealer sites. It has no canonical tag, no Open Graph tags, and no heading structure beyond navigation text.

   What to change: Rewrite the www.demmer.com page with comprehensive brand information, inventory search, location details, and proper HTML metadata including canonical and Open Graph tags.

6. No external mentions of the brand found in web search results Medium

   Multiple web searches for the brand name, dealer names, and related terms returned zero results. No Reddit threads, press coverage, DealerRater reviews, or Google review pages surfaced, indicating a lack of external signals that could boost AI visibility.

   What to change: Encourage customer reviews on platforms like DealerRater and Google, and pursue local press coverage or community event listings to build external signals.

7. LLM prior knowledge of the brand is more detailed than the actual website provides Medium

   The LLM knows Jack Demmer Automotive Group as a family-owned dealership network founded in the 1960s in Wayne, Michigan, selling Ford, Lincoln, and Mazda. This information is not present on any of the brand's domains, creating a gap where the AI cannot corroborate its knowledge with the brand's own content.

   What to change: Add the brand's history, founding story, locations, and vehicle brands to the hub page and dealer sites so that AI crawlers can index and reinforce this information.

8. Dealer sites block standard browsers with 403 High

   Both jdemmerford.com and demmerlincoln.net return 403 Forbidden to standard browser user agents, not just AI crawlers. This suggests a misconfiguration that may also affect human visitors.

   What to change: Review Akamai configuration to allow standard browser user agents to access the dealer sites. Ensure the sites are accessible to all legitimate visitors.

What's working

• Anthropic-ai crawler is whitelisted on dealer sites — The dealer sites allow the anthropic-ai crawler through Akamai, returning full HTML content (over 400KB per page) with inventory and service information. This gives Claude access to the site's content.
• Hub domain demmer.com (HTTP) is accessible to all tested bots — The HTTP version of demmer.com returns 200 to all 11 tested bots, including GPTBot, ClaudeBot, and PerplexityBot, ensuring no bot is blocked at the root domain level.
• LLM has detailed prior knowledge of the brand — The LLM knows Jack Demmer Automotive Group as a family-owned dealership network founded in the 1960s in Wayne, Michigan, selling Ford, Lincoln, and Mazda. This provides a foundation for AI visibility if the website content aligns.