Calix GigaSpire BLAST u4
Router security check

Calix GigaSpire BLAST u4

CalixISP GatewayMade in China

Report IMRS-CAL-U4Method: public-record scoring

Verified
Apr 2026
Score41/100
Protections0/8
7 missing1 partly

Is the Calix GigaSpire BLAST u4 safe?

No. This router leaves your home network open.

It has 0 of the 8 protections we check in full, your internet provider controls its updates, and it has 1 serious security finding.

Your GigaSpire BLAST u4 scored F. Rio scores A on the same test.

$20 off for router checkers. $179.99 with code CHECKED20, applied at checkout.

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Free shipping · 30-day returns · 1-year warranty · 1 year of Rio VPN included
The risks

What this means for you

The top 3 risks, most serious first.

  1. Serious

    It’s made abroad, so the FCC’s 2026 foreign-made router rule applies

    The GigaSpire BLAST is manufactured in China. The FCC's March 2026 rule applies to ISP-supplied premises equipment as well as retail routers.

    Do this: Contact your ISP to ask about hardware replacement options under the FCC rule
    Source: FCC Equipment Authorization Database ↗
  2. Moderate

    Your internet provider controls its software, not you

    Calix GigaSpire devices are fully managed by your ISP. You cannot independently audit the firmware or configure advanced security settings.

  3. Minor

    Calix Inc. is a US public company

    The concern here is manufacturing origin, not ownership jurisdiction.

The 8 protections

Protections it’s missing

Missing 7 of 8. Has 1 only partly.

We check every router for the same 8 protections. Here is how the Calix GigaSpire BLAST u4 does.

  • Blocks unknown devices from joining

    Locked by your ISP

    New devices stay out until you approve them once, even if they have the Wi-Fi password.

    Zero-Trust Device Admission

  • Keeps smart gadgets away from your computers

    Locked by your ISP

    Devices are kept apart, so a hacked smart TV can’t reach your laptop.

    Network Segmentation (VLANs)

  • Encrypts internet traffic for every device

    Locked by your ISP

    Traffic leaving your home is encrypted, even from devices that can’t run a VPN app.

    Router-Level VPN

  • Locks a device to approved sites

    Locked by your ISP

    A device can reach only the sites you approve. Everything else is blocked.

    Domain Allowlisting

  • Separate Wi-Fi passwords per group

    Locked by your ISP

    Each part of your network gets its own password.

    Granular Password Control

  • Guest access that expires

    Locked by your ISP

    Guests are removed when they leave and need your approval to reconnect.

    Guest Auto-Expiry

  • Made outside China’s legal reach

    Locked by your ISP

    Not subject to China’s National Intelligence Law.

    Clean Supply Chain

  • Watches for attacks in real time

    Partly

    Spots suspicious devices, traffic and known attacks as they happen.

    Active Threat Monitoring
Your next steps

Fix it today

  1. Contact your ISP to ask about hardware replacement options under the FCC rule
    Why: It’s made abroad, so the FCC’s 2026 foreign-made router rule applies.
  2. Ask if a US-manufactured alternative is available from your provider
  3. For advanced control, consider placing a secondary router behind the gateway in DMZ mode
From the team behind this site

Keep your ISP internet. Rio runs your Wi-Fi.

Your GigaSpire BLAST u4
F
Missing 7 of 8
Rio Router
A
Has all 8
  • You approve every device. Nothing new joins your network until you say yes in the Rio app.
  • Smart devices live apart from your computers. Up to 16 separate rooms, each with its own password.
  • US company, made in Taiwan. No government flags.
Get Rio for $179.99

$20 off for router checkers with code CHECKED20, applied at checkout. Regular price $199.99.
1 year of Rio VPN included, then $7.99/month or $79.99/year · 30-day returns · 1-year warranty

Rio builds this site and is graded by the same method. See the method

Free router alerts

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How we scored it70% from who makes it, FCC status and updates. 30% from the 8 protections.

1Scores

Maker, FCC status and updates 54/100 · 70%
The 8 protections 12/100 · 30%

2Calculation

54 × 0.7 + 12 × 0.3 = 41/100, grade F. 85+ is an A, 65+ a B, 45+ a C, 30+ a D, below 30 an F. ISP gateways made in China get an F.

3The facts behind it

Who makes it
US-headquarteredCalix, Inc., San Jose, CA - NYSE: CALX. GigaSpire BLAST family ISP-premises equipment manufactured in China.
Made in
China
Security updates
Managed by ISP
FCC approval
FCC authorized - foreign manufacture rule applies
FCC restrictions
Foreign manufacture - subject to FCC March 2026 ban
Last verified
April 2026

Your ISP does not publish a public security patch log or end-of-life schedule for residential gateways. Patch status here is inferred from firmware release notes and third-party advisories.

4Sources

  1. FCC Equipment Authorization Database ↗
  2. FCC Covered List · National Security Designation ↗

Every finding traces to public sources: FCC filings, NIST CVE records and US government advisories. Read the full method · Report an error

Other Calix models

FGigaSpire BLAST u6x
FGigaSpire BLAST u6m

See every Calix model: Calix brand overview →

Your GigaSpire BLAST u4 scored F. Rio scores A. $20 off with code CHECKED20.
Fix my F router, $20 off →