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Thursday, March 27, 2025

Data Technical News #2025 - 9
Nasdaq Options PHLX Depth Channel Rebalancing and Addition of a New NDX Channel

Markets Impacted:

  • Nasdaq PHLX

Products Impacted:

  • Nasdaq PHLX Depth

Contact Information:

What you need to know:

Effective 04/28/2025, PHLX Depth channels 11 and 12 will be rebalanced and a new channel 20 will be established for NDX to optimize market data distribution in both A and B feeds.

What is changing?

Symbol distribution will be rebalanced across channels 11 and12. Additionally, NDX market data distribution will be split between the current channel 19 and the newly established channel 20.

Details in the changes are below:

  • Channel 11 changes from O-P to O-R excluding QQQ
  • Channel 12 changes from Q-R to QQQ only
  • Channel 19 changes from NDX to NDX Calls only
  • Channel 20 will be newly established for NDX Puts only

Symbol distribution and channel addition is effective April 28th, 2025:

PHLX Depth of Market

UDP/IP Protocol Standard: MoldUDP64

Symbology Compliant: Yes

Initial Release Date: July 2, 2012
Site Channel/Purpose Group Port Source IP Address

New York Metro Area - "A" Feed

RP: 207.251.255.48
A Feed 2 Broadcast - Channel 11 (O - R) excluding QQQ 233.47.179.138 18011 206.200.151.160/27
Rerequest UDP - Channel 11 (O - R) excluding QQQ 18111 206.200.151.65
Rerequest TCP - Channel 11 (O - R) excluding QQQ 18111 206.200.151.65
Broadcast - Channel 12 (QQQ only) 233.47.179.101 18012 206.200.151.160/27
Rerequest UDP - Channel 12 (QQQ only) 18112 206.200.151.15
Rerequest TCP - Channel 12 (QQQ only) 18112 206.200.151.15
Broadcast - Channel 19 (NDX Calls only) 233.47.179.128 18008

206.200.151.160/27

(206.200.151.168)
Rerequest UDP - Channel 19 (NDX Calls only) 18108 206.200.151.50
Rerequest TCP - Channel 19 (NDX Calls only) 18108 206.200.151.50
Broadcast - Channel 20 (NDX Puts only) 233.47.179.128 18024 206.200.151.168
Rerequest UDP - Channel 20 (NDX Puts only) 18124 206.200.151.50
Rerequest TCP - Channel 20 (NDX Puts only) 18124 206.200.151.50

New York Metro Area - "B" Feed

RP: 207.251.255.58
B Feed 2 Broadcast - Channel 11 (O - R) excluding QQQ 233.47.179.202 18011 206.200.151.224/27
Rerequest UDP - Channel 11 (O - R) excluding QQQ 18111 206.200.151.68
Rerequest TCP - Channel 11 (O - R) excluding QQQ 18111 206.200.151.68
Broadcast - Channel 12 (QQQ only) 233.47.179.165 18012 206.200.151.224/27
Rerequest UDP - Channel 12 (QQQ only) 18112 206.200.151.79
Rerequest TCP - Channel 12 (QQQ only) 18112 206.200.151.79
Broadcast - Channel 19 (NDX Calls only) 233.47.179.192 18008 206.200.151.232
Rerequest UDP - Channel 19 (NDX Calls only) 18108 206.200.151.114
Rerequest TCP - Channel 19 (NDX Calls only) 18108 206.200.151.114
Broadcast - Channel 20 (NDX Puts only) 233.47.179.192 18024 206.200.151.232
Rerequest UDP - Channel 20 (NDX Puts only) 18124 206.200.151.114
Rerequest TCP - Channel 20 (NDX Puts only) 18124 206.200.151.114

Chicago Metro Area "A" – U.S.

RP: 207.251.255.97
Chicago Metro Area "A" - U.S. Broadcast - Channel 11 (O - R) excluding QQQ 233.187.20.96 18011 206.200.95.0/25
Rerequest UDP - Channel 11 (O - R) excluding QQQ 233.187.20.96 18111 206.200.92.248
Rerequest TCP - Channel 11 (O - R) excluding QQQ 233.187.20.96 18111 206.200.92.249
Broadcast - Channel 12 (QQQ only) 233.187.20.96 18012 206.200.95.0/25
Rerequest UDP - Channel 12 (QQQ only) 233.187.20.96 18112 206.200.92.133
Rerequest TCP - Channel 12 (QQQ only) 233.187.20.96 18112 206.200.92.141
Broadcast - Channel 19 (NDX Calls only) 233.187.20.96 18008 206.200.95.67
Rerequest UDP - Channel 19 (NDX Calls only) 233.187.20.96 18108 206.200.92.232
Rerequest TCP - Channel 19 (NDX Calls only) 233.187.20.96 18108 206.200.92.234
Broadcast - Channel 20 (NDX Puts only) 233.187.20.96 18024 206.200.95.67
Rerequest UDP - Channel 20 (NDX Puts only) 233.187.20.96 18124 206.200.92.232
Rerequest TCP - Channel 20 (NDX Puts only) 233.187.20.96 18124 206.200.92.234

Chicago Metro Area "B" – U.S.

RP: 207.251.255.98
Chicago Metro Area "B" - U.S. Broadcast - Channel 11 (O - R) excluding QQQ 233.187.20.104 18011 206.200.95.128/25
Broadcast - Channel 12 (QQQ only) 233.187.20.104 18012 206.200.95.128/25
Broadcast - Channel 19 (NDX Calls only) 233.187.20.104 18008 206.200.95.141
Broadcast - Channel 20 (NDX Puts only) 233.187.20.104 18024 206.200.95.141

These changes will also be reflected on Nasdaq UDP/IP Address Page.

When will the changes be effective?

Changes will be effective starting April 28th, 2025.

What product will this impact?

PHLX Depth of Market Feed only.

Will there be testing available for these changes?

Yes, UAT will be available on April 5th, 2025, between 8:00 AM – 12:00 PM EST.

Why is Nasdaq making these changes?

Due to increased market volatility, channels 11 and 12 will be rebalanced. In addition, NDX Calls will now be available on channel 19 and NDX Puts will be available on the newly established channel 20 to optimize the market data traffic across all channels.


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