ARRIS SURFboard Cable Modems & Gateways Support Hub
CommScope's ARRIS SURFboard lineup (including the flagship SURFboard S33, S34, and SB8200 DOCSIS 3.1 cable modems and G34 / G36 modem-router gateways) powers millions of US cable broadband connections. Just like Motorola DOCSIS modems, SURFboard cable modem firmware is pushed exclusively by your cable ISP (Comcast Xfinity, Cox, Spectrum), while the local web interface at https://192.168.100.1 allows you to inspect OFDM/OFDMA channel bonding and uncorrectable codewords.
Arris Quick Reference & Official Support Links
| Resource / Setting | Verified Arris Specification |
|---|---|
| Default Gateway IP | SURFboard Modems (S33/S34/SB8200): 192.168.100.1 | Gateways (G34/G36): 192.168.0.1 |
| Local Login URL / Host | https://192.168.100.1 or http://192.168.0.1 |
| Default Admin Credentials | Username: admin | Password: last 8 digits of the serial number or printed on bottom label |
| Management App / Software | ARRIS SURFboard Central App & Local Web Diagnostic UI |
| Official Firmware Downloads | https://www.surfboard.com/support/resources/ ↗ |
| Official Product Support & Manuals | https://www.surfboard.com/support/ ↗ |
| Security Advisories & CVE Bulletins | https://www.commscope.com/support/ ↗ |
Popular Arris Models & Hardware Specifications
| Model Name | Category | Key Networking Specs | Best Use Case |
|---|---|---|---|
| SURFboard S34 | Next-Gen Mid-Split DOCSIS 3.1 Modem | Supports Xfinity Next Gen 200+ Mbps upload tiers, 1x 2.5GbE + 1x 1GbE port | Xfinity Mid-Split & 2 Gbps cable internet |
| SURFboard S33 | Multi-Gig DOCSIS 3.1 Cable Modem | 32x8 DOCSIS 3.0 + 2x2 DOCSIS 3.1, 1x 2.5GbE port + 1x 1GbE port, fanless | 1–2 Gbps Cox, Spectrum & Xfinity plans |
| SURFboard SB8200 | Gigabit DOCSIS 3.1 Cable Modem | Dual 1GbE ports with LACP Link Aggregation support | Cable plans up to 1 Gbps |
| SURFboard G36 (AX3000) | DOCSIS 3.1 Modem + WiFi 6 Router | Integrated DOCSIS 3.1 modem + AX3000 WiFi 6 router, 1x 2.5GbE + 3x 1GbE LAN | All-in-one cable modem and router |
How to Update Arris Firmware Safely
- Open https://192.168.100.1 (for S33, S34, or SB8200 modems) or http://192.168.0.1 (for G34/G36 combo gateways) and accept the self-signed HTTPS warning.
- Log in with username 'admin' and the default password printed on the bottom sticker (or the last 8 digits of the Serial Number on older SB8200 builds).
- Check Product Information to view the ISP-provisioned firmware version and Status to verify Locked OFDM/OFDMA channels.
- If using a G34/G36 gateway with your own standalone WiFi router, enable Bridge Mode in the gateway settings to eliminate Double NAT.
Arris Frequently Asked Questions
Can I plug two separate routers into the two Ethernet ports on an ARRIS S33 or SB8200?
Only if your residential ISP provides two public IPv4 addresses (most US cable ISPs only assign one public IP). Only connect your primary router to the 2.5GbE port and leave the second port empty.
What does a solid Blue vs Green front LED mean on the ARRIS S33/SB8200?
A solid Blue receive/send LED indicates the modem has successfully locked onto high-speed DOCSIS 3.1 OFDM/OFDMA channels, whereas Green indicates DOCSIS 3.0 operation.
How do I fix high 'Uncorrectable Codewords' on my ARRIS SURFboard status page?
Rising uncorrectable errors across multiple QAM/OFDM channels indicate RF ingress or a corroded coaxial drop/splitter. Tighten all F-connectors, remove unused splitters, and have your ISP check the outdoor tap if errors persist.