Autonomous system detail  ·  US flag US

AS7922

Announced

Operated by Comcast Cable Communications, LLC, US flag US.

Summary

// analyst note
Default assumption for a 7922 IP is a US residential broadband subscriber; treat with dynamic-IP/CGNAT caution and avoid durable attribution.
// security note
Residential/eyeball space — dynamic IP reassignment (73.x/96.x) and CGNAT (100.64.0.0/10) in some areas; an IP can map to different subscribers over time.
IPv4 prefixes
426
~68.3M addresses
IPv6 prefixes
11
announced
Peer networks
143
2 up · 10 down
IANA block
7723-8191
Assigned by ARIN
[ 01 ] — Context

About this ASN.

Updated  ·  Confidence: High  ·  6 sources  ·  How this page is checked

AS7922 is the principal autonomous system of Comcast Cable Communications, the largest residential broadband provider in the United States, marketed as XFINITY. Registered under ARIN since February 1997, it anchors an eyeball network serving on the order of 31 million domestic broadband customers, so the default assumption for an address in this ASN is a US residential subscriber. The network announces several hundred prefixes of its own and many more once customer space is counted, with an originated IPv4 footprint in the tens of millions of addresses; common consumer ranges include 73.x and 96.x, and carrier-grade NAT (100.64.0.0/10) appears in some markets. Comcast also runs supporting infrastructure — its network hosts an anycast instance of ICANN's L-root (l.root-servers.net), announcing ICANN's 199.7.83.0/24 from AS7922; the root server itself is operated by ICANN (from AS20144), not by Comcast. Comcast peers selectively, requiring a traffic ratio and a contract rather than peering on shared public switches. For triage, the key caveat is dynamic IP reassignment: a given address can map to different subscribers over time, and behind CGNAT a single IP can represent many homes, so attribution must be per-IP and timestamped. No carrier-specific abuse listing of note was found as of June 2026; per-IP reputation can still vary widely from the parent ASN.

Operator
Comcast Cable Communications, LLC (ARIN OrgId CCCS) [Confirmed] — ARIN RDAP/WHOIS
Country / RIR
US, ARIN [Confirmed] — ARIN RDAP
Allocated
1997-02-14 (ARIN ASN RegDate) [Confirmed] — ARIN RDAP
Org status
active — corporate.comcast.com

Security/abuse context

residential/eyeball space — dynamic IP reassignment (e.g., 73.x/96.x) and CGNAT (100.64.0.0/10) in some areas, so an IP can map to different subscribers over time; consumer-NAT and infected-home-PC considerations apply per-IP and dated. No carrier-specific abuse listing of note as of 2026-06-04

Network & routing

Our research recorded 700 IPv4 prefixes; RouteViews currently observes 426.
Network type
ISP-eyeball (largest US residential ISP) + some backbone [Confirmed] — PeeringDB + CAIDA
Size
~673–750 IPv4 prefixes originated (~3,485 total; ~10,249 announced incl. customers), ~77 IPv6; ~15.4M–68.3M IPv4 addresses (registered vs announced); downstream cone ~2,655 — BigDataCloud / bgp.he.net / bgp.tools (2026-05/06)
Routing/peering
~202–246 peers; ~8 upstreams; selective peering (ratio + contract required; not on shared public switches) — peeringdb.com
Notable usage
largest US residential broadband network (XFINITY); ~31M domestic broadband customers per Comcast Q1 2026 filing; hosts an anycast instance of ICANN's L-root (announces 199.7.83.0/24 for l.root-servers.net from AS7922; ICANN operates L-root itself via AS20144) — corporate.comcast.com, peeringdb.com/net/822
Related ASNs
additional Comcast ASNs (e.g., AS33650, AS33651, AS33652)
Analyst note
Default assumption for a 7922 IP is a US residential broadband subscriber; treat with dynamic-IP/CGNAT caution and avoid durable attribution.
[ 02 ] — Announced prefixes

What this network routes.

437 prefixes total · as observed by RouteViews at 2026-09-20 · one collector view, not a global census
// IPv4 prefixes426
  1. 73.0.0.0/8/8
  2. 50.128.0.0/9/9
  3. 98.192.0.0/10/10
  4. 174.160.0.0/11/11
  5. 67.160.0.0/11/11
  6. 68.32.0.0/11/11
  7. 76.128.0.0/11/11
  8. 76.96.0.0/11/11
  9. 96.128.0.0/11/11
  10. 96.192.0.0/11/11
  11. 96.64.0.0/11/11
  12. 98.32.0.0/11/11
  13. 174.48.0.0/12/12
  14. 184.112.0.0/12/12
  15. 24.0.0.0/12/12
  16. 69.240.0.0/12/12
  17. 71.192.0.0/12/12
  18. 71.224.0.0/12/12
  19. 74.16.0.0/12/12
  20. 76.16.0.0/12/12
  21. 96.96.0.0/12/12
  22. 173.160.0.0/13/13
  23. 173.8.0.0/13/13
  24. 24.16.0.0/13/13
  25. 68.80.0.0/13/13
  26. 69.136.0.0/13/13
  27. 71.56.0.0/13/13
  28. 75.144.0.0/13/13
  29. 75.64.0.0/13/13
  30. 96.112.0.0/13/13
  31. 107.0.0.0/14/14
  32. 162.148.0.0/14/14
  33. 184.108.0.0/14/14
  34. 23.68.0.0/14/14
  35. 24.60.0.0/14/14
  36. 50.76.0.0/14/14
  37. 70.88.0.0/14/14
  38. 71.24.0.0/14/14
  39. 74.92.0.0/14/14
  40. 96.120.0.0/14/14
  41. 107.4.0.0/15/15
  42. 23.24.0.0/15/15
  43. 23.30.0.0/15/15
  44. 24.126.0.0/15/15
  45. 24.130.0.0/15/15
  46. 24.98.0.0/15/15
  47. 66.176.0.0/15/15
  48. 66.30.0.0/15/15
  49. 69.180.0.0/15/15
  50. 75.72.0.0/15/15
  51. 147.191.0.0/16/16
  52. 162.17.0.0/16/16
  53. 165.137.0.0/16/16
  54. 169.152.0.0/16/16
  55. 172.244.0.0/16/16
  56. 198.0.0.0/16/16
  57. 24.118.0.0/16/16
  58. 24.125.0.0/16/16
  59. 24.128.0.0/16/16
  60. 24.147.0.0/16/16
  61. 24.218.0.0/16/16
  62. 24.34.0.0/16/16
  63. 24.91.0.0/16/16
  64. 50.73.0.0/16/16
  65. 65.96.0.0/16/16
  66. 66.229.0.0/16/16
  67. 66.41.0.0/16/16
  68. 75.74.0.0/16/16
  69. 96.124.0.0/16/16
  70. 216.45.128.0/17/17
  71. 24.104.0.0/17/17
  72. 24.124.128.0/17/17
  73. 24.129.0.0/17/17
  74. 24.30.0.0/17/17
  75. 65.34.128.0/17/17
  76. 72.55.0.0/17/17
  77. 75.75.0.0/17/17
  78. 208.39.128.0/18/18
  79. 209.23.192.0/18/18
  80. 24.245.0.0/18/18
  81. 24.40.0.0/18/18
  82. 48.45.64.0/18/18
  83. 48.46.0.0/18/18
  84. 48.46.128.0/18/18
  85. 48.47.128.0/18/18
  86. 66.208.192.0/18/18
  87. 66.240.0.0/18/18
  88. 66.56.0.0/18/18
  89. 75.75.128.0/18/18
  90. 24.104.128.0/19/19
  91. 24.153.64.0/19/19
  92. 48.45.0.0/19/19
  93. 48.46.192.0/19/19
  94. 48.47.192.0/19/19
  95. 64.139.64.0/19/19
  96. 64.56.32.0/19/19
  97. 65.97.0.0/19/19
  98. 74.81.128.0/19/19
  99. 24.40.64.0/20/20
  100. 48.44.160.0/20/20
  101. 48.45.32.0/20/20
  102. 48.45.48.0/20/20
  103. 48.46.240.0/20/20
  104. 198.178.8.0/21/21
  105. 48.44.192.0/21/21
  106. 48.44.72.0/21/21
  107. 48.45.104.0/21/21
  108. 48.45.112.0/21/21
  109. 48.45.120.0/21/21
  110. 48.45.24.0/21/21
  111. 48.45.40.0/21/21
  112. 48.45.80.0/21/21
  113. 48.45.88.0/21/21
  114. 48.45.96.0/21/21
  115. 48.46.128.0/21/21
  116. 48.46.144.0/21/21
  117. 48.46.152.0/21/21
  118. 48.46.160.0/21/21
  119. 48.46.168.0/21/21
  120. 48.46.192.0/21/21
  121. 48.46.200.0/21/21
  122. 48.46.208.0/21/21
  123. 48.46.216.0/21/21
  124. 48.46.232.0/21/21
  125. 48.46.240.0/21/21
  126. 48.46.32.0/21/21
  127. 48.47.128.0/21/21
  128. 48.47.136.0/21/21
  129. 48.47.144.0/21/21
  130. 48.47.152.0/21/21
  131. 48.47.160.0/21/21
  132. 48.47.168.0/21/21
  133. 48.47.176.0/21/21
  134. 48.47.184.0/21/21
  135. 48.47.192.0/21/21
  136. 48.47.224.0/21/21
  137. 48.47.240.0/21/21
  138. 140.99.132.0/22/22
  139. 204.11.116.0/22/22
  140. 216.122.112.0/22/22
  141. 216.122.116.0/22/22
  142. 48.44.104.0/22/22
  143. 48.44.200.0/22/22
  144. 48.44.204.0/22/22
  145. 48.44.208.0/22/22
  146. 48.44.212.0/22/22
  147. 48.44.216.0/22/22
  148. 48.44.220.0/22/22
  149. 48.44.28.0/22/22
  150. 48.44.36.0/22/22
  151. 48.44.64.0/22/22
  152. 48.44.92.0/22/22
  153. 48.44.96.0/22/22
  154. 48.45.16.0/22/22
  155. 48.45.20.0/22/22
  156. 48.45.204.0/22/22
  157. 48.45.232.0/22/22
  158. 48.45.68.0/22/22
  159. 48.45.72.0/22/22
  160. 48.45.8.0/22/22
  161. 48.46.0.0/22/22
  162. 48.46.104.0/22/22
  163. 48.46.112.0/22/22
  164. 48.46.12.0/22/22
  165. 48.46.120.0/22/22
  166. 48.46.136.0/22/22
  167. 48.46.140.0/22/22
  168. 48.46.16.0/22/22
  169. 48.46.180.0/22/22
  170. 48.46.184.0/22/22
  171. 48.46.188.0/22/22
  172. 48.46.20.0/22/22
  173. 48.46.24.0/22/22
  174. 48.46.252.0/22/22
  175. 48.46.28.0/22/22
  176. 48.46.4.0/22/22
  177. 48.46.44.0/22/22
  178. 48.46.56.0/22/22
  179. 48.46.76.0/22/22
  180. 48.46.8.0/22/22
  181. 48.46.84.0/22/22
  182. 48.46.92.0/22/22
  183. 48.46.96.0/22/22
  184. 48.47.100.0/22/22
  185. 48.47.108.0/22/22
  186. 48.47.120.0/22/22
  187. 48.47.124.0/22/22
  188. 48.47.16.0/22/22
  189. 48.47.200.0/22/22
  190. 48.47.204.0/22/22
  191. 48.47.208.0/22/22
  192. 48.47.212.0/22/22
  193. 48.47.216.0/22/22
  194. 48.47.220.0/22/22
  195. 48.47.24.0/22/22
  196. 48.47.252.0/22/22
  197. 48.47.36.0/22/22
  198. 48.47.52.0/22/22
  199. 48.47.64.0/22/22
  200. 48.47.72.0/22/22
  201. 48.47.8.0/22/22
  202. 48.47.80.0/22/22
  203. 48.47.92.0/22/22
  204. 173.214.184.0/23/23
  205. 174.140.228.0/23/23
  206. 198.137.252.0/23/23
  207. 48.44.102.0/23/23
  208. 48.44.110.0/23/23
  209. 48.44.114.0/23/23
  210. 48.44.118.0/23/23
  211. 48.44.122.0/23/23
  212. 48.44.126.0/23/23
  213. 48.44.32.0/23/23
  214. 48.44.52.0/23/23
  215. 48.44.6.0/23/23
  216. 48.44.68.0/23/23
  217. 48.44.8.0/23/23
  218. 48.44.82.0/23/23
  219. 48.44.86.0/23/23
  220. 48.44.88.0/23/23
  221. 48.45.0.0/23/23
  222. 48.45.12.0/23/23
  223. 48.45.132.0/23/23
  224. 48.45.14.0/23/23
  225. 48.45.148.0/23/23
  226. 48.45.156.0/23/23
  227. 48.45.166.0/23/23
  228. 48.45.172.0/23/23
  229. 48.45.176.0/23/23
  230. 48.45.180.0/23/23
  231. 48.45.188.0/23/23
  232. 48.45.2.0/23/23
  233. 48.45.210.0/23/23
  234. 48.45.216.0/23/23
  235. 48.45.228.0/23/23
  236. 48.45.250.0/23/23
  237. 48.45.32.0/23/23
  238. 48.45.34.0/23/23
  239. 48.45.36.0/23/23
  240. 48.45.38.0/23/23
  241. 48.45.4.0/23/23
  242. 48.45.64.0/23/23
  243. 48.45.66.0/23/23
  244. 48.45.76.0/23/23
  245. 48.45.78.0/23/23
  246. 48.46.102.0/23/23
  247. 48.46.108.0/23/23
  248. 48.46.116.0/23/23
  249. 48.46.124.0/23/23
  250. 48.46.176.0/23/23
  251. 48.46.178.0/23/23
  252. 48.46.248.0/23/23
  253. 48.46.250.0/23/23
  254. 48.46.40.0/23/23
  255. 48.46.42.0/23/23
  256. 48.46.48.0/23/23
  257. 48.46.50.0/23/23
  258. 48.46.52.0/23/23
  259. 48.46.54.0/23/23
  260. 48.46.60.0/23/23
  261. 48.46.62.0/23/23
  262. 48.46.66.0/23/23
  263. 48.46.68.0/23/23
  264. 48.46.72.0/23/23
  265. 48.46.82.0/23/23
  266. 48.46.88.0/23/23
  267. 48.47.106.0/23/23
  268. 48.47.114.0/23/23
  269. 48.47.116.0/23/23
  270. 48.47.12.0/23/23
  271. 48.47.2.0/23/23
  272. 48.47.22.0/23/23
  273. 48.47.232.0/23/23
  274. 48.47.234.0/23/23
  275. 48.47.248.0/23/23
  276. 48.47.30.0/23/23
  277. 48.47.32.0/23/23
  278. 48.47.4.0/23/23
  279. 48.47.40.0/23/23
  280. 48.47.44.0/23/23
  281. 48.47.46.0/23/23
  282. 48.47.50.0/23/23
  283. 48.47.58.0/23/23
  284. 48.47.60.0/23/23
  285. 48.47.68.0/23/23
  286. 48.47.78.0/23/23
  287. 48.47.86.0/23/23
  288. 48.47.88.0/23/23
  289. 48.47.96.0/23/23
  290. 140.99.127.0/24/24
  291. 140.99.210.0/24/24
  292. 140.99.49.0/24/24
  293. 140.99.77.0/24/24
  294. 140.99.79.0/24/24
  295. 204.93.173.0/24/24
  296. 205.234.162.0/24/24
  297. 205.234.234.0/24/24
  298. 207.180.15.0/24/24
  299. 207.180.54.0/24/24
  300. 207.180.8.0/24/24
  301. 207.180.9.0/24/24
  302. 209.101.248.0/24/24
  303. 209.101.249.0/24/24
  304. 209.101.250.0/24/24
  305. 209.101.251.0/24/24
  306. 216.246.102.0/24/24
  307. 216.246.28.0/24/24
  308. 216.246.7.0/24/24
  309. 48.44.1.0/24/24
  310. 48.44.101.0/24/24
  311. 48.44.109.0/24/24
  312. 48.44.113.0/24/24
  313. 48.44.117.0/24/24
  314. 48.44.124.0/24/24
  315. 48.44.2.0/24/24
  316. 48.44.34.0/24/24
  317. 48.44.4.0/24/24
  318. 48.44.51.0/24/24
  319. 48.44.54.0/24/24
  320. 48.44.71.0/24/24
  321. 48.44.81.0/24/24
  322. 48.44.84.0/24/24
  323. 48.45.128.0/24/24
  324. 48.45.129.0/24/24
  325. 48.45.131.0/24/24
  326. 48.45.135.0/24/24
  327. 48.45.136.0/24/24
  328. 48.45.137.0/24/24
  329. 48.45.139.0/24/24
  330. 48.45.141.0/24/24
  331. 48.45.143.0/24/24
  332. 48.45.144.0/24/24
  333. 48.45.145.0/24/24
  334. 48.45.147.0/24/24
  335. 48.45.152.0/24/24
  336. 48.45.153.0/24/24
  337. 48.45.155.0/24/24
  338. 48.45.159.0/24/24
  339. 48.45.160.0/24/24
  340. 48.45.161.0/24/24
  341. 48.45.163.0/24/24
  342. 48.45.168.0/24/24
  343. 48.45.169.0/24/24
  344. 48.45.171.0/24/24
  345. 48.45.175.0/24/24
  346. 48.45.179.0/24/24
  347. 48.45.183.0/24/24
  348. 48.45.184.0/24/24
  349. 48.45.185.0/24/24
  350. 48.45.187.0/24/24
  351. 48.45.190.0/24/24
  352. 48.45.208.0/24/24
  353. 48.45.212.0/24/24
  354. 48.45.213.0/24/24
  355. 48.45.215.0/24/24
  356. 48.45.218.0/24/24
  357. 48.45.227.0/24/24
  358. 48.45.230.0/24/24
  359. 48.45.237.0/24/24
  360. 48.45.238.0/24/24
  361. 48.45.240.0/24/24
  362. 48.45.241.0/24/24
  363. 48.45.243.0/24/24
  364. 48.45.244.0/24/24
  365. 48.45.245.0/24/24
  366. 48.45.246.0/24/24
  367. 48.45.247.0/24/24
  368. 48.45.249.0/24/24
  369. 48.45.252.0/24/24
  370. 48.45.253.0/24/24
  371. 48.45.255.0/24/24
  372. 48.46.101.0/24/24
  373. 48.46.119.0/24/24
  374. 48.46.127.0/24/24
  375. 48.46.65.0/24/24
  376. 48.46.71.0/24/24
  377. 48.46.81.0/24/24
  378. 48.46.91.0/24/24
  379. 48.47.1.0/24/24
  380. 48.47.104.0/24/24
  381. 48.47.113.0/24/24
  382. 48.47.118.0/24/24
  383. 48.47.15.0/24/24
  384. 48.47.20.0/24/24
  385. 48.47.29.0/24/24
  386. 48.47.34.0/24/24
  387. 48.47.43.0/24/24
  388. 48.47.48.0/24/24
  389. 48.47.57.0/24/24
  390. 48.47.6.0/24/24
  391. 48.47.62.0/24/24
  392. 48.47.71.0/24/24
  393. 48.47.76.0/24/24
  394. 48.47.85.0/24/24
  395. 48.47.90.0/24/24
  396. 48.47.99.0/24/24
  397. 50.220.178.0/24/24
  398. 66.253.72.0/24/24
  399. 66.253.76.0/24/24
  400. 66.253.77.0/24/24
  401. 66.253.78.0/24/24
  402. 66.93.180.0/24/24
  403. 66.93.181.0/24/24
  404. 66.93.182.0/24/24
  405. 66.93.183.0/24/24
  406. 66.93.43.0/24/24
  407. 66.93.45.0/24/24
  408. 66.93.46.0/24/24
  409. 66.93.47.0/24/24
  410. 68.167.24.0/24/24
  411. 68.167.25.0/24/24
  412. 68.167.26.0/24/24
  413. 68.167.27.0/24/24
  414. 68.167.56.0/24/24
  415. 68.167.57.0/24/24
  416. 68.167.58.0/24/24
  417. 68.167.59.0/24/24
  418. 72.244.138.0/24/24
  419. 72.244.144.0/24/24
  420. 72.244.146.0/24/24
  421. 72.244.152.0/24/24
  422. 74.49.227.0/24/24
  423. 74.49.240.0/24/24
  424. 74.49.242.0/24/24
  425. 74.49.244.0/24/24
  426. 74.49.246.0/24/24
// IPv6 prefixes11
  1. 2601::/20/20
  2. 2603:2000::/20/20
  3. 2603:3000::/24/24
  4. 2001:558::/29/29
  5. 2001:559:9005::/48/48
  6. 2001:559:900e::/48/48
  7. 2001:559:9013::/48/48
  8. 2001:559:9015::/48/48
  9. 2001:559:9026::/48/48
  10. 2001:559:9028::/48/48
  11. 2620:fd:8000::/48/48
[ 03 ] — Notable peers & upstreams

Who it talks to.

143 observed neighbours
// Notable connections32 of 143 observed

Neighbours observed by RouteViews at 2026-09-20, lowest ASN first. Relationships are inferences from the CAIDA AS Relationships Dataset, 2026-08-01, and establish no commercial arrangement; a dash means the inference did not resolve.

ASNOperatorRole
AS3356 Level 3 Parent, LLC (Lumen Technologies) upstream
AS6453 Tata Communications (America) Inc. upstream
AS174 Cogent Communications, LLC peer
AS577 Bell Canada peer
AS701 Verizon Business (MCI Communications Services) peer
AS1280 — peer
AS1299 Arelion Sweden AB peer
AS1547 — downstream
AS2152 — peer
AS2516 — peer
AS2559 — downstream
AS2635 — downstream
AS2906 Netflix Streaming Services Inc. peer
AS2914 NTT America, Inc. peer
AS3223 — downstream
AS3257 GTT Communications, Inc. peer
AS3320 Deutsche Telekom AG peer
AS3778 — peer
AS4258 — downstream
AS4766 — peer
AS4837 China Unicom (China United Network Communications) peer
AS5511 Orange S.A. peer
AS6128 — peer
AS6461 — peer
AS6507 — downstream
AS6653 — downstream
AS6762 Telecom Italia Sparkle S.p.A. peer
AS6830 Liberty Global Europe Holding B.V. peer
AS6939 Hurricane Electric LLC peer
AS6949 — downstream
AS7015 — downstream
AS7016 — downstream
Neighbours observed via public BGP collectors; not a complete peering list.